init

.gitignore

@@ -0,0 +1,5 @@
+.idea
+training_examples
+objaverse_examples
+ldm/__pycache__/
+

app.py

@@ -0,0 +1,106 @@
+from functools import partial
+
+from PIL import Image
+import numpy as np
+import gradio as gr
+import torch
+import os
+import fire
+
+from ldm.util import add_margin
+
+_TITLE = '''SyncDreamer: Generating Multiview-consistent Images from a Single-view Image'''
+_DESCRIPTION = '''
+<div>
+<a style="display:inline-block" href="https://liuyuan-pal.github.io/SyncDreamer/"><img src="https://img.shields.io/badge/SyncDremer-Homepage-blue"></a>
+<a style="display:inline-block; margin-left: .5em" href="https://arxiv.org/abs/2309.03453"><img src="https://img.shields.io/badge/2309.03453-f9f7f7?logo=data:image/png;base64,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"></a>
+<a style="display:inline-block; margin-left: .5em" href='https://github.com/liuyuan-pal/SyncDreamer'><img src='https://img.shields.io/github/stars/liuyuan-pal/SyncDreamer?style=social' /></a>
+</div>
+Given a single-view image, SyncDreamer is able to generate multiview-consistent images, which enables direct 3D reconstruction with NeuS or NeRF without SDS loss'''
+_USER_GUIDE0 = "Step0: Please upload an image in the block above (or choose an example above). We use alpha values as object masks if given."
+_USER_GUIDE1 = "Step1: Please select a crop size using the glider."
+_USER_GUIDE2 = "Step2: Please choose a suitable elevation angle and then click the Generate button."
+
+
+def mask_prediction(mask_predictor, image_in: Image.Image):
+    if image_in.mode=='RGBA':
+        return image_in
+    else:
+        raise NotImplementedError
+
+def resize_inputs(image_input, crop_size):
+    alpha_np = np.asarray(image_input)[:, :, 3]
+    coords = np.stack(np.nonzero(alpha_np), 1)[:, (1, 0)]
+    min_x, min_y = np.min(coords, 0)
+    max_x, max_y = np.max(coords, 0)
+    ref_img_ = image_input.crop((min_x, min_y, max_x, max_y))
+    h, w = ref_img_.height, ref_img_.width
+    scale = crop_size / max(h, w)
+    h_, w_ = int(scale * h), int(scale * w)
+    ref_img_ = ref_img_.resize((w_, h_), resample=Image.BICUBIC)
+    results = add_margin(ref_img_, size=256)
+    return results
+
+def generate(syncdreamer_model, image, elevation):
+
+
+def run_demo():
+    device = f"cuda:0" if torch.cuda.is_available() else "cpu"
+    models = None # init_model(device, os.path.join(code_dir, ckpt))
+
+    # init sam model
+    mask_predictor = None # sam_init(device_idx)
+
+    # with open('instructions_12345.md', 'r') as f:
+    #     article = f.read()
+
+    # NOTE: Examples must match inputs
+    example_folder = os.path.join(os.path.dirname(__file__), 'hf_demo', 'examples')
+    example_fns = os.listdir(example_folder)
+    example_fns.sort()
+    examples_full = [os.path.join(example_folder, x) for x in example_fns if x.endswith('.png')]
+
+    # Compose demo layout & data flow.
+    with gr.Blocks(title=_TITLE, css="hf_demo/style.css") as demo:
+        with gr.Row():
+            with gr.Column(scale=1):
+                gr.Markdown('# ' + _TITLE)
+            # with gr.Column(scale=0):
+            #     gr.DuplicateButton(value='Duplicate Space for private use', elem_id='duplicate-button')
+        gr.Markdown(_DESCRIPTION)
+
+        with gr.Row(variant='panel'):
+            with gr.Column(scale=1):
+                image_block = gr.Image(type='pil', image_mode='RGBA', height=256, label='Input image', tool=None, interactive=True)
+                guide_text = gr.Markdown(_USER_GUIDE0, visible=True)
+                gr.Examples(
+                    examples=examples_full,  # NOTE: elements must match inputs list!
+                    inputs=[image_block],
+                    outputs=[image_block],
+                    cache_examples=False,
+                    label='Examples (click one of the images below to start)',
+                    examples_per_page=40
+                )
+
+            with gr.Column(scale=1):
+                sam_block = gr.Image(type='pil', image_mode='RGBA', label="SAM output", height=256, interactive=False)
+                crop_size_slider = gr.Slider(120, 240, 200, step=10, label='Crop size', interactive=True)
+
+            with gr.Column(scale=1):
+                input_block = gr.Image(type='pil', image_mode='RGB', label="Input to SyncDreamer", height=256, interactive=False)
+                elevation_slider = gr.Slider(-10, 40, 30, step=5, label='Elevation angle', interactive=True)
+                run_btn = gr.Button('Run Generation', variant='primary', interactive=False)
+
+        update_guide = lambda GUIDE_TEXT: gr.update(value=GUIDE_TEXT)
+        image_block.change(fn=partial(mask_prediction, mask_predictor), inputs=[image_block], outputs=[sam_block], queue=False)\
+                   .success(fn=partial(update_guide, _USER_GUIDE1), outputs=[guide_text], queue=False)
+
+        crop_size_slider.change(fn=resize_inputs, inputs=[sam_block, crop_size_slider], outputs=[input_block], queue=False)\
+                        .success(fn=partial(update_guide, _USER_GUIDE2), outputs=[guide_text], queue=False)
+
+        run_btn.click
+
+    demo.queue().launch(share=False, max_threads=80)  # auth=("admin", os.environ['PASSWD'])
+
+if __name__=="__main__":
+    fire.Fire(run_demo)

blender_script.py

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+"""Blender script to render images of 3D models.
+
+This script is used to render images of 3D models. It takes in a list of paths
+to .glb files and renders images of each model. The images are from rotating the
+object around the origin. The images are saved to the output directory.
+
+Example usage:
+    blender -b -P blender_script.py -- \
+        --object_path my_object.glb \
+        --output_dir ./views \
+        --engine CYCLES \
+        --scale 0.8 \
+        --num_images 12 \
+        --camera_dist 1.2
+
+Here, input_model_paths.json is a json file containing a list of paths to .glb.
+"""
+
+import argparse
+import json
+import math
+import os
+import random
+import sys
+import time
+import urllib.request
+from pathlib import Path
+
+from mathutils import Vector, Matrix
+import numpy as np
+
+import bpy
+from mathutils import Vector
+import pickle
+
+def read_pickle(pkl_path):
+    with open(pkl_path, 'rb') as f:
+        return pickle.load(f)
+
+def save_pickle(data, pkl_path):
+    # os.system('mkdir -p {}'.format(os.path.dirname(pkl_path)))
+    with open(pkl_path, 'wb') as f:
+        pickle.dump(data, f)
+
+parser = argparse.ArgumentParser()
+parser.add_argument("--object_path", type=str, required=True)
+parser.add_argument("--output_dir", type=str, required=True)
+parser.add_argument("--engine", type=str, default="CYCLES", choices=["CYCLES", "BLENDER_EEVEE"])
+parser.add_argument("--camera_type", type=str, default='even')
+parser.add_argument("--num_images", type=int, default=16)
+parser.add_argument("--elevation", type=float, default=30)
+parser.add_argument("--elevation_start", type=float, default=-10)
+parser.add_argument("--elevation_end", type=float, default=40)
+parser.add_argument("--device", type=str, default='CUDA')
+
+argv = sys.argv[sys.argv.index("--") + 1 :]
+args = parser.parse_args(argv)
+
+print('===================', args.engine, '===================')
+
+context = bpy.context
+scene = context.scene
+render = scene.render
+
+cam = scene.objects["Camera"]
+cam.location = (0, 1.2, 0)
+cam.data.lens = 35
+cam.data.sensor_width = 32
+
+cam_constraint = cam.constraints.new(type="TRACK_TO")
+cam_constraint.track_axis = "TRACK_NEGATIVE_Z"
+cam_constraint.up_axis = "UP_Y"
+
+render.engine = args.engine
+render.image_settings.file_format = "PNG"
+render.image_settings.color_mode = "RGBA"
+render.resolution_x = 256
+render.resolution_y = 256
+render.resolution_percentage = 100
+
+scene.cycles.device = "GPU"
+scene.cycles.samples = 128
+scene.cycles.diffuse_bounces = 1
+scene.cycles.glossy_bounces = 1
+scene.cycles.transparent_max_bounces = 3
+scene.cycles.transmission_bounces = 3
+scene.cycles.filter_width = 0.01
+scene.cycles.use_denoising = True
+scene.render.film_transparent = True
+
+bpy.context.preferences.addons["cycles"].preferences.get_devices()
+# Set the device_type
+bpy.context.preferences.addons["cycles"].preferences.compute_device_type = args.device # or "OPENCL"
+bpy.context.scene.cycles.tile_size = 8192
+
+
+def az_el_to_points(azimuths, elevations):
+    x = np.cos(azimuths)*np.cos(elevations)
+    y = np.sin(azimuths)*np.cos(elevations)
+    z = np.sin(elevations)
+    return np.stack([x,y,z],-1) #
+
+def set_camera_location(cam_pt):
+    # from https://blender.stackexchange.com/questions/18530/
+    x, y, z = cam_pt # sample_spherical(radius_min=1.5, radius_max=2.2, maxz=2.2, minz=-2.2)
+    camera = bpy.data.objects["Camera"]
+    camera.location = x, y, z
+
+    return camera
+
+def get_calibration_matrix_K_from_blender(camera):
+    f_in_mm = camera.data.lens
+    scene = bpy.context.scene
+    resolution_x_in_px = scene.render.resolution_x
+    resolution_y_in_px = scene.render.resolution_y
+    scale = scene.render.resolution_percentage / 100
+    sensor_width_in_mm = camera.data.sensor_width
+    sensor_height_in_mm = camera.data.sensor_height
+    pixel_aspect_ratio = scene.render.pixel_aspect_x / scene.render.pixel_aspect_y
+
+    if camera.data.sensor_fit == 'VERTICAL':
+        # the sensor height is fixed (sensor fit is horizontal),
+        # the sensor width is effectively changed with the pixel aspect ratio
+        s_u = resolution_x_in_px * scale / sensor_width_in_mm / pixel_aspect_ratio
+        s_v = resolution_y_in_px * scale / sensor_height_in_mm
+    else:  # 'HORIZONTAL' and 'AUTO'
+        # the sensor width is fixed (sensor fit is horizontal),
+        # the sensor height is effectively changed with the pixel aspect ratio
+        s_u = resolution_x_in_px * scale / sensor_width_in_mm
+        s_v = resolution_y_in_px * scale * pixel_aspect_ratio / sensor_height_in_mm
+
+    # Parameters of intrinsic calibration matrix K
+    alpha_u = f_in_mm * s_u
+    alpha_v = f_in_mm * s_u
+    u_0 = resolution_x_in_px * scale / 2
+    v_0 = resolution_y_in_px * scale / 2
+    skew = 0  # only use rectangular pixels
+
+    K = np.asarray(((alpha_u, skew, u_0),
+                    (0, alpha_v, v_0),
+                    (0, 0, 1)),np.float32)
+    return K
+
+
+def reset_scene() -> None:
+    """Resets the scene to a clean state."""
+    # delete everything that isn't part of a camera or a light
+    for obj in bpy.data.objects:
+        if obj.type not in {"CAMERA", "LIGHT"}:
+            bpy.data.objects.remove(obj, do_unlink=True)
+    # delete all the materials
+    for material in bpy.data.materials:
+        bpy.data.materials.remove(material, do_unlink=True)
+    # delete all the textures
+    for texture in bpy.data.textures:
+        bpy.data.textures.remove(texture, do_unlink=True)
+    # delete all the images
+    for image in bpy.data.images:
+        bpy.data.images.remove(image, do_unlink=True)
+
+
+# load the glb model
+def load_object(object_path: str) -> None:
+    """Loads a glb model into the scene."""
+    if object_path.endswith(".glb"):
+        bpy.ops.import_scene.gltf(filepath=object_path, merge_vertices=True)
+    elif object_path.endswith(".fbx"):
+        bpy.ops.import_scene.fbx(filepath=object_path)
+    else:
+        raise ValueError(f"Unsupported file type: {object_path}")
+
+
+def scene_bbox(single_obj=None, ignore_matrix=False):
+    bbox_min = (math.inf,) * 3
+    bbox_max = (-math.inf,) * 3
+    found = False
+    for obj in scene_meshes() if single_obj is None else [single_obj]:
+        found = True
+        for coord in obj.bound_box:
+            coord = Vector(coord)
+            if not ignore_matrix:
+                coord = obj.matrix_world @ coord
+            bbox_min = tuple(min(x, y) for x, y in zip(bbox_min, coord))
+            bbox_max = tuple(max(x, y) for x, y in zip(bbox_max, coord))
+    if not found:
+        raise RuntimeError("no objects in scene to compute bounding box for")
+    return Vector(bbox_min), Vector(bbox_max)
+
+
+def scene_root_objects():
+    for obj in bpy.context.scene.objects.values():
+        if not obj.parent:
+            yield obj
+
+
+def scene_meshes():
+    for obj in bpy.context.scene.objects.values():
+        if isinstance(obj.data, (bpy.types.Mesh)):
+            yield obj
+
+# function from https://github.com/panmari/stanford-shapenet-renderer/blob/master/render_blender.py
+def get_3x4_RT_matrix_from_blender(cam):
+    bpy.context.view_layer.update()
+    location, rotation = cam.matrix_world.decompose()[0:2]
+    R = np.asarray(rotation.to_matrix())
+    t = np.asarray(location)
+
+    cam_rec = np.asarray([[1, 0, 0], [0, -1, 0], [0, 0, -1]], np.float32)
+    R = R.T
+    t = -R @ t
+    R_world2cv = cam_rec @ R
+    t_world2cv = cam_rec @ t
+
+    RT = np.concatenate([R_world2cv,t_world2cv[:,None]],1)
+    return RT
+
+def normalize_scene():
+    bbox_min, bbox_max = scene_bbox()
+    scale = 1 / max(bbox_max - bbox_min)
+    for obj in scene_root_objects():
+        obj.scale = obj.scale * scale
+    # Apply scale to matrix_world.
+    bpy.context.view_layer.update()
+    bbox_min, bbox_max = scene_bbox()
+    offset = -(bbox_min + bbox_max) / 2
+    for obj in scene_root_objects():
+        obj.matrix_world.translation += offset
+    bpy.ops.object.select_all(action="DESELECT")
+
+def save_images(object_file: str) -> None:
+    object_uid = os.path.basename(object_file).split(".")[0]
+    os.makedirs(args.output_dir, exist_ok=True)
+
+    reset_scene()
+    # load the object
+    load_object(object_file)
+    # object_uid = os.path.basename(object_file).split(".")[0]
+    normalize_scene()
+
+    # create an empty object to track
+    empty = bpy.data.objects.new("Empty", None)
+    scene.collection.objects.link(empty)
+    cam_constraint.target = empty
+
+    world_tree = bpy.context.scene.world.node_tree
+    back_node = world_tree.nodes['Background']
+    env_light = 0.5
+    back_node.inputs['Color'].default_value = Vector([env_light, env_light, env_light, 1.0])
+    back_node.inputs['Strength'].default_value = 1.0
+
+    distances = np.asarray([1.5 for _ in range(args.num_images)])
+    if args.camera_type=='fixed':
+        azimuths = (np.arange(args.num_images)/args.num_images*np.pi*2).astype(np.float32)
+        elevations = np.deg2rad(np.asarray([args.elevation] * args.num_images).astype(np.float32))
+    elif args.camera_type=='random':
+        azimuths = (np.arange(args.num_images) / args.num_images * np.pi * 2).astype(np.float32)
+        elevations = np.random.uniform(args.elevation_start, args.elevation_end, args.num_images)
+        elevations = np.deg2rad(elevations)
+    else:
+        raise NotImplementedError
+
+    cam_pts = az_el_to_points(azimuths, elevations) * distances[:,None]
+    cam_poses = []
+    (Path(args.output_dir) / object_uid).mkdir(exist_ok=True, parents=True)
+    for i in range(args.num_images):
+        # set camera
+        camera = set_camera_location(cam_pts[i])
+        RT = get_3x4_RT_matrix_from_blender(camera)
+        cam_poses.append(RT)
+
+        render_path = os.path.join(args.output_dir, object_uid, f"{i:03d}.png")
+        if os.path.exists(render_path): continue
+        scene.render.filepath = os.path.abspath(render_path)
+        bpy.ops.render.render(write_still=True)
+
+    if args.camera_type=='random':
+        K = get_calibration_matrix_K_from_blender(camera)
+        cam_poses = np.stack(cam_poses, 0)
+        save_pickle([K, azimuths, elevations, distances, cam_poses], os.path.join(args.output_dir, object_uid, "meta.pkl"))
+
+if __name__ == "__main__":
+    save_images(args.object_path)

configs/nerf.yaml

@@ -0,0 +1,25 @@
+model:
+  base_lr: 1.0e-2
+  target: renderer.renderer.RendererTrainer
+  params:
+    total_steps: 2000
+    warm_up_steps: 100
+    train_batch_num: 40960
+    test_batch_num: 40960
+    renderer: ngp
+    cube_bound: 0.6
+    use_mask: true
+    lambda_rgb_loss: 0.5
+    lambda_mask_loss: 10.0
+
+data:
+  target: renderer.dummy_dataset.DummyDataset
+  params: {}
+
+callbacks:
+  save_interval: 5000
+
+trainer:
+  val_check_interval: 500
+  max_steps: 2000
+

configs/neus.yaml

@@ -0,0 +1,26 @@
+model:
+  base_lr: 5.0e-4
+  target: renderer.renderer.RendererTrainer
+  params:
+    total_steps: 2000
+    warm_up_steps: 100
+    train_batch_num: 3584
+    train_batch_fg_num: 512
+    test_batch_num: 4096
+    use_mask: true
+    lambda_rgb_loss: 0.5
+    lambda_mask_loss: 1.0
+    lambda_eikonal_loss: 0.1
+    use_warm_up: true
+
+data:
+  target: renderer.dummy_dataset.DummyDataset
+  params: {}
+
+callbacks:
+  save_interval: 500
+
+trainer:
+  val_check_interval: 500
+  max_steps: 2000
+

configs/syncdreamer-train.yaml

@@ -0,0 +1,63 @@
+model:
+  base_learning_rate: 5.0e-05
+  target: ldm.models.diffusion.sync_dreamer.SyncMultiviewDiffusion
+  params:
+    view_num: 16
+    image_size: 256
+    cfg_scale: 2.0
+    output_num: 8
+    batch_view_num: 4
+    finetune_unet: false
+    finetune_projection: false
+    drop_conditions: false
+    clip_image_encoder_path: ckpt/ViT-L-14.pt
+
+    scheduler_config: # 10000 warmup steps
+      target: ldm.lr_scheduler.LambdaLinearScheduler
+      params:
+        warm_up_steps: [ 100 ]
+        cycle_lengths: [ 100000 ]
+        f_start: [ 0.02 ]
+        f_max: [ 1.0 ]
+        f_min: [ 1.0 ]
+
+    unet_config:
+      target: ldm.models.diffusion.sync_dreamer_attention.DepthWiseAttention
+      params:
+        volume_dims: [64, 128, 256, 512]
+        image_size: 32
+        in_channels: 8
+        out_channels: 4
+        model_channels: 320
+        attention_resolutions: [ 4, 2, 1 ]
+        num_res_blocks: 2
+        channel_mult: [ 1, 2, 4, 4 ]
+        num_heads: 8
+        use_spatial_transformer: True
+        transformer_depth: 1
+        context_dim: 768
+        use_checkpoint: True
+        legacy: False
+
+data:
+  target: ldm.data.sync_dreamer.SyncDreamerDataset
+  params:
+    target_dir: training_examples/target # renderings of target views
+    input_dir: training_examples/input # renderings of input views
+    uid_set_pkl: training_examples/uid_set.pkl # a list of uids
+    validation_dir: validation_set # directory of validation data
+    batch_size: 24 # batch size for a single gpu
+    num_workers: 8
+
+lightning:
+  modelcheckpoint:
+    params:
+      every_n_train_steps: 1000 # we will save models every 1k steps
+  callbacks:
+    {}
+
+  trainer:
+    benchmark: True
+    val_check_interval: 1000 # we will run validation every 1k steps, the validation will output images to <log_dir>/<images>/val
+    num_sanity_val_steps: 0
+    check_val_every_n_epoch: null

configs/syncdreamer.yaml

@@ -0,0 +1,45 @@
+model:
+  base_learning_rate: 5.0e-05
+  target: ldm.models.diffusion.sync_dreamer.SyncMultiviewDiffusion
+  params:
+    view_num: 16
+    image_size: 256
+    cfg_scale: 2.0
+    output_num: 8
+    batch_view_num: 4
+    finetune_unet: false
+    finetune_projection: false
+    drop_conditions: false
+    clip_image_encoder_path: ckpt/ViT-L-14.pt
+
+    scheduler_config: # 10000 warmup steps
+      target: ldm.lr_scheduler.LambdaLinearScheduler
+      params:
+        warm_up_steps: [ 100 ]
+        cycle_lengths: [ 100000 ]
+        f_start: [ 0.02 ]
+        f_max: [ 1.0 ]
+        f_min: [ 1.0 ]
+
+    unet_config:
+      target: ldm.models.diffusion.sync_dreamer_attention.DepthWiseAttention
+      params:
+        volume_dims: [64, 128, 256, 512]
+        image_size: 32
+        in_channels: 8
+        out_channels: 4
+        model_channels: 320
+        attention_resolutions: [ 4, 2, 1 ]
+        num_res_blocks: 2
+        channel_mult: [ 1, 2, 4, 4 ]
+        num_heads: 8
+        use_spatial_transformer: True
+        transformer_depth: 1
+        context_dim: 768
+        use_checkpoint: True
+        legacy: False
+
+data: {}
+
+lightning:
+  trainer: {}

foreground_segment.py

@@ -0,0 +1,50 @@
+import cv2
+import argparse
+import numpy as np
+
+import torch
+from PIL import Image
+
+
+class BackgroundRemoval:
+    def __init__(self, device='cuda'):
+        from carvekit.api.high import HiInterface
+        self.interface = HiInterface(
+            object_type="object",  # Can be "object" or "hairs-like".
+            batch_size_seg=5,
+            batch_size_matting=1,
+            device=device,
+            seg_mask_size=640,  # Use 640 for Tracer B7 and 320 for U2Net
+            matting_mask_size=2048,
+            trimap_prob_threshold=231,
+            trimap_dilation=30,
+            trimap_erosion_iters=5,
+            fp16=True,
+        )
+
+    @torch.no_grad()
+    def __call__(self, image):
+        # image: [H, W, 3] array in [0, 255].
+        image = Image.fromarray(image)
+        image = self.interface([image])[0]
+        image = np.array(image)
+        return image
+
+def process(image_path, mask_path):
+    mask_predictor = BackgroundRemoval()
+    image = cv2.imread(image_path, cv2.IMREAD_UNCHANGED)
+    if image.shape[-1] == 4:
+        image = cv2.cvtColor(image, cv2.COLOR_BGRA2RGB)
+    else:
+        image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
+    rgba = mask_predictor(image)  # [H, W, 4]
+    cv2.imwrite(mask_path, cv2.cvtColor(rgba, cv2.COLOR_RGBA2BGRA))
+
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--input', required=True, type=str)
+    parser.add_argument('--output', required=True, type=str)
+    opt = parser.parse_args()
+
+    process(opt.input, opt.output)

generate.py

@@ -0,0 +1,62 @@
+import argparse
+from pathlib import Path
+
+import numpy as np
+import torch
+from omegaconf import OmegaConf
+from skimage.io import imsave
+
+from ldm.models.diffusion.sync_dreamer import SyncMultiviewDiffusion
+from ldm.util import instantiate_from_config, prepare_inputs
+
+
+def load_model(cfg,ckpt,strict=True):
+    config = OmegaConf.load(cfg)
+    model = instantiate_from_config(config.model)
+    print(f'loading model from {ckpt} ...')
+    ckpt = torch.load(ckpt,map_location='cpu')
+    model.load_state_dict(ckpt['state_dict'],strict=strict)
+    model = model.cuda().eval()
+    return model
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--cfg',type=str, default='configs/syncdreamer.yaml')
+    parser.add_argument('--ckpt',type=str, default='ckpt/syncdreamer-step80k.ckpt')
+    parser.add_argument('--output', type=str, required=True)
+    parser.add_argument('--input', type=str, required=True)
+    parser.add_argument('--elevation', type=float, required=True)
+
+    parser.add_argument('--sample_num', type=int, default=4)
+    parser.add_argument('--crop_size', type=int, default=-1)
+    parser.add_argument('--cfg_scale', type=float, default=2.0)
+    parser.add_argument('--batch_view_num', type=int, default=8)
+    parser.add_argument('--seed', type=int, default=6033)
+    flags = parser.parse_args()
+
+    torch.random.manual_seed(flags.seed)
+    np.random.seed(flags.seed)
+
+    model = load_model(flags.cfg, flags.ckpt, strict=True)
+    assert isinstance(model, SyncMultiviewDiffusion)
+    Path(f'{flags.output}').mkdir(exist_ok=True, parents=True)
+
+    # prepare data
+    data = prepare_inputs(flags.input, flags.elevation, flags.crop_size)
+    for k, v in data.items():
+        data[k] = v.unsqueeze(0).cuda()
+        data[k] = torch.repeat_interleave(data[k], flags.sample_num, dim=0)
+    x_sample = model.sample(data, flags.cfg_scale, flags.batch_view_num)
+
+    B, N, _, H, W = x_sample.shape
+    x_sample = (torch.clamp(x_sample,max=1.0,min=-1.0) + 1) * 0.5
+    x_sample = x_sample.permute(0,1,3,4,2).cpu().numpy() * 255
+    x_sample = x_sample.astype(np.uint8)
+
+    for bi in range(B):
+        output_fn = Path(flags.output)/ f'{bi}.png'
+        imsave(output_fn, np.concatenate([x_sample[bi,ni] for ni in range(N)], 1))
+
+if __name__=="__main__":
+    main()
+

hf_demo/style.css

@@ -0,0 +1,33 @@
+#model-3d-out {
+    height: 400px;
+} 
+
+#plot-out {
+    height: 450px;
+}
+
+#duplicate-button {
+    margin-left: auto;
+    color: #fff;
+    background: #1565c0;
+  }
+
+.footer {
+    margin-bottom: 45px;
+    margin-top: 10px;
+    text-align: center;
+    border-bottom: 1px solid #e5e5e5;
+}
+.footer>p {
+    font-size: .8rem;
+    display: inline-block;
+    padding: 0 10px;
+    transform: translateY(15px);
+    background: white;
+}
+.dark .footer {
+    border-color: #303030;
+}
+.dark .footer>p {
+    background: #0b0f19;
+}

ldm/base_utils.py

@@ -0,0 +1,158 @@
+import pickle
+import numpy as np
+import cv2
+from skimage.io import imread
+
+
+def save_pickle(data, pkl_path):
+    # os.system('mkdir -p {}'.format(os.path.dirname(pkl_path)))
+    with open(pkl_path, 'wb') as f:
+        pickle.dump(data, f)
+
+def read_pickle(pkl_path):
+    with open(pkl_path, 'rb') as f:
+        return pickle.load(f)
+
+def draw_epipolar_line(F, img0, img1, pt0, color):
+    h1,w1=img1.shape[:2]
+    hpt = np.asarray([pt0[0], pt0[1], 1], dtype=np.float32)[:, None]
+    l = F @ hpt
+    l = l[:, 0]
+    a, b, c = l[0], l[1], l[2]
+    pt1 = np.asarray([0, -c / b]).astype(np.int32)
+    pt2 = np.asarray([w1, (-a * w1 - c) / b]).astype(np.int32)
+
+    img0 = cv2.circle(img0, tuple(pt0.astype(np.int32)), 5, color, 2)
+    img1 = cv2.line(img1, tuple(pt1), tuple(pt2), color, 2)
+    return img0, img1
+
+def draw_epipolar_lines(F, img0, img1,num=20):
+    img0,img1=img0.copy(),img1.copy()
+    h0, w0, _ = img0.shape
+    h1, w1, _ = img1.shape
+
+    for k in range(num):
+        color = np.random.randint(0, 255, [3], dtype=np.int32)
+        color = [int(c) for c in color]
+        pt = np.random.uniform(0, 1, 2)
+        pt[0] *= w0
+        pt[1] *= h0
+        pt = pt.astype(np.int32)
+        img0, img1 = draw_epipolar_line(F, img0, img1, pt, color)
+
+    return img0, img1
+
+def compute_F(K1, K2, Rt0, Rt1=None):
+    if Rt1 is None:
+        R, t = Rt0[:,:3], Rt0[:,3:]
+    else:
+        Rt = compute_dR_dt(Rt0,Rt1)
+        R, t = Rt[:,:3], Rt[:,3:]
+    A = K1 @ R.T @ t # [3,1]
+    C = np.asarray([[0,-A[2,0],A[1,0]],
+                    [A[2,0],0,-A[0,0]],
+                    [-A[1,0],A[0,0],0]])
+    F = (np.linalg.inv(K2)).T @ R @ K1.T @ C
+    return F
+
+def compute_dR_dt(Rt0, Rt1):
+    R0, t0 = Rt0[:,:3], Rt0[:,3:]
+    R1, t1 = Rt1[:,:3], Rt1[:,3:]
+    dR = np.dot(R1, R0.T)
+    dt = t1 - np.dot(dR, t0)
+    return np.concatenate([dR, dt], -1)
+
+def concat_images(img0,img1,vert=False):
+    if not vert:
+        h0,h1=img0.shape[0],img1.shape[0],
+        if h0<h1: img0=cv2.copyMakeBorder(img0,0,h1-h0,0,0,borderType=cv2.BORDER_CONSTANT,value=0)
+        if h1<h0: img1=cv2.copyMakeBorder(img1,0,h0-h1,0,0,borderType=cv2.BORDER_CONSTANT,value=0)
+        img = np.concatenate([img0, img1], axis=1)
+    else:
+        w0,w1=img0.shape[1],img1.shape[1]
+        if w0<w1: img0=cv2.copyMakeBorder(img0,0,0,0,w1-w0,borderType=cv2.BORDER_CONSTANT,value=0)
+        if w1<w0: img1=cv2.copyMakeBorder(img1,0,0,0,w0-w1,borderType=cv2.BORDER_CONSTANT,value=0)
+        img = np.concatenate([img0, img1], axis=0)
+
+    return img
+
+def concat_images_list(*args,vert=False):
+    if len(args)==1: return args[0]
+    img_out=args[0]
+    for img in args[1:]:
+        img_out=concat_images(img_out,img,vert)
+    return img_out
+
+
+def pose_inverse(pose):
+    R = pose[:,:3].T
+    t = - R @ pose[:,3:]
+    return np.concatenate([R,t],-1)
+
+def project_points(pts,RT,K):
+    pts = np.matmul(pts,RT[:,:3].transpose())+RT[:,3:].transpose()
+    pts = np.matmul(pts,K.transpose())
+    dpt = pts[:,2]
+    mask0 = (np.abs(dpt)<1e-4) & (np.abs(dpt)>0)
+    if np.sum(mask0)>0: dpt[mask0]=1e-4
+    mask1=(np.abs(dpt) > -1e-4) & (np.abs(dpt) < 0)
+    if np.sum(mask1)>0: dpt[mask1]=-1e-4
+    pts2d = pts[:,:2]/dpt[:,None]
+    return pts2d, dpt
+
+
+def draw_keypoints(img, kps, colors=None, radius=2):
+    out_img=img.copy()
+    for pi, pt in enumerate(kps):
+        pt = np.round(pt).astype(np.int32)
+        if colors is not None:
+            color=[int(c) for c in colors[pi]]
+            cv2.circle(out_img, tuple(pt), radius, color, -1)
+        else:
+            cv2.circle(out_img, tuple(pt), radius, (0,255,0), -1)
+    return out_img
+
+
+def output_points(fn,pts,colors=None):
+    with open(fn, 'w') as f:
+        for pi, pt in enumerate(pts):
+            f.write(f'{pt[0]:.6f} {pt[1]:.6f} {pt[2]:.6f} ')
+            if colors is not None:
+                f.write(f'{int(colors[pi,0])} {int(colors[pi,1])} {int(colors[pi,2])}')
+            f.write('\n')
+
+DEPTH_MAX, DEPTH_MIN = 2.4, 0.6
+DEPTH_VALID_MAX, DEPTH_VALID_MIN = 2.37, 0.63
+def read_depth_objaverse(depth_fn):
+    depth = imread(depth_fn)
+    depth = depth.astype(np.float32) / 65535 * (DEPTH_MAX-DEPTH_MIN) + DEPTH_MIN
+    mask = (depth > DEPTH_VALID_MIN) & (depth < DEPTH_VALID_MAX)
+    return depth, mask
+
+
+def mask_depth_to_pts(mask,depth,K,rgb=None):
+    hs,ws=np.nonzero(mask)
+    depth=depth[hs,ws]
+    pts=np.asarray([ws,hs,depth],np.float32).transpose()
+    pts[:,:2]*=pts[:,2:]
+    if rgb is not None:
+        return np.dot(pts, np.linalg.inv(K).transpose()), rgb[hs,ws]
+    else:
+        return np.dot(pts, np.linalg.inv(K).transpose())
+
+def transform_points_pose(pts, pose):
+    R, t = pose[:, :3], pose[:, 3]
+    if len(pts.shape)==1:
+        return (R @ pts[:,None] + t[:,None])[:,0]
+    return pts @ R.T + t[None,:]
+
+def pose_apply(pose,pts):
+    return transform_points_pose(pts, pose)
+
+def downsample_gaussian_blur(img, ratio):
+    sigma = (1 / ratio) / 3
+    # ksize=np.ceil(2*sigma)
+    ksize = int(np.ceil(((sigma - 0.8) / 0.3 + 1) * 2 + 1))
+    ksize = ksize + 1 if ksize % 2 == 0 else ksize
+    img = cv2.GaussianBlur(img, (ksize, ksize), sigma, borderType=cv2.BORDER_REFLECT101)
+    return img

ldm/data/base.py

@@ -0,0 +1,40 @@
+import os
+import numpy as np
+from abc import abstractmethod
+from torch.utils.data import Dataset, ConcatDataset, ChainDataset, IterableDataset
+
+
+class Txt2ImgIterableBaseDataset(IterableDataset):
+    '''
+    Define an interface to make the IterableDatasets for text2img data chainable
+    '''
+    def __init__(self, num_records=0, valid_ids=None, size=256):
+        super().__init__()
+        self.num_records = num_records
+        self.valid_ids = valid_ids
+        self.sample_ids = valid_ids
+        self.size = size
+
+        print(f'{self.__class__.__name__} dataset contains {self.__len__()} examples.')
+
+    def __len__(self):
+        return self.num_records
+
+    @abstractmethod
+    def __iter__(self):
+        pass
+
+
+class PRNGMixin(object):
+    """
+    Adds a prng property which is a numpy RandomState which gets
+    reinitialized whenever the pid changes to avoid synchronized sampling
+    behavior when used in conjunction with multiprocessing.
+    """
+    @property
+    def prng(self):
+        currentpid = os.getpid()
+        if getattr(self, "_initpid", None) != currentpid:
+            self._initpid = currentpid
+            self._prng = np.random.RandomState()
+        return self._prng

ldm/data/coco.py

@@ -0,0 +1,253 @@
+import os
+import json
+import albumentations
+import numpy as np
+from PIL import Image
+from tqdm import tqdm
+from torch.utils.data import Dataset
+from abc import abstractmethod
+
+
+class CocoBase(Dataset):
+    """needed for (image, caption, segmentation) pairs"""
+    def __init__(self, size=None, dataroot="", datajson="", onehot_segmentation=False, use_stuffthing=False,
+                 crop_size=None, force_no_crop=False, given_files=None, use_segmentation=True,crop_type=None):
+        self.split = self.get_split()
+        self.size = size
+        if crop_size is None:
+            self.crop_size = size
+        else:
+            self.crop_size = crop_size
+
+        assert crop_type in [None, 'random', 'center']
+        self.crop_type = crop_type
+        self.use_segmenation = use_segmentation
+        self.onehot = onehot_segmentation       # return segmentation as rgb or one hot
+        self.stuffthing = use_stuffthing        # include thing in segmentation
+        if self.onehot and not self.stuffthing:
+            raise NotImplemented("One hot mode is only supported for the "
+                                 "stuffthings version because labels are stored "
+                                 "a bit different.")
+
+        data_json = datajson
+        with open(data_json) as json_file:
+            self.json_data = json.load(json_file)
+            self.img_id_to_captions = dict()
+            self.img_id_to_filepath = dict()
+            self.img_id_to_segmentation_filepath = dict()
+
+        assert data_json.split("/")[-1] in [f"captions_train{self.year()}.json",
+                                            f"captions_val{self.year()}.json"]
+        # TODO currently hardcoded paths, would be better to follow logic in
+        # cocstuff pixelmaps
+        if self.use_segmenation:
+            if self.stuffthing:
+                self.segmentation_prefix = (
+                    f"data/cocostuffthings/val{self.year()}" if
+                    data_json.endswith(f"captions_val{self.year()}.json") else
+                    f"data/cocostuffthings/train{self.year()}")
+            else:
+                self.segmentation_prefix = (
+                    f"data/coco/annotations/stuff_val{self.year()}_pixelmaps" if
+                    data_json.endswith(f"captions_val{self.year()}.json") else
+                    f"data/coco/annotations/stuff_train{self.year()}_pixelmaps")
+
+        imagedirs = self.json_data["images"]
+        self.labels = {"image_ids": list()}
+        for imgdir in tqdm(imagedirs, desc="ImgToPath"):
+            self.img_id_to_filepath[imgdir["id"]] = os.path.join(dataroot, imgdir["file_name"])
+            self.img_id_to_captions[imgdir["id"]] = list()
+            pngfilename = imgdir["file_name"].replace("jpg", "png")
+            if self.use_segmenation:
+                self.img_id_to_segmentation_filepath[imgdir["id"]] = os.path.join(
+                    self.segmentation_prefix, pngfilename)
+            if given_files is not None:
+                if pngfilename in given_files:
+                    self.labels["image_ids"].append(imgdir["id"])
+            else:
+                self.labels["image_ids"].append(imgdir["id"])
+
+        capdirs = self.json_data["annotations"]
+        for capdir in tqdm(capdirs, desc="ImgToCaptions"):
+            # there are in average 5 captions per image
+            #self.img_id_to_captions[capdir["image_id"]].append(np.array([capdir["caption"]]))
+            self.img_id_to_captions[capdir["image_id"]].append(capdir["caption"])
+
+        self.rescaler = albumentations.SmallestMaxSize(max_size=self.size)
+        if self.split=="validation":
+            self.cropper = albumentations.CenterCrop(height=self.crop_size, width=self.crop_size)
+        else:
+            # default option for train is random crop
+            if self.crop_type in [None, 'random']:
+                self.cropper = albumentations.RandomCrop(height=self.crop_size, width=self.crop_size)
+            else:
+                self.cropper = albumentations.CenterCrop(height=self.crop_size, width=self.crop_size)
+        self.preprocessor = albumentations.Compose(
+            [self.rescaler, self.cropper],
+            additional_targets={"segmentation": "image"})
+        if force_no_crop:
+            self.rescaler = albumentations.Resize(height=self.size, width=self.size)
+            self.preprocessor = albumentations.Compose(
+                [self.rescaler],
+                additional_targets={"segmentation": "image"})
+
+    @abstractmethod
+    def year(self):
+        raise NotImplementedError()
+
+    def __len__(self):
+        return len(self.labels["image_ids"])
+
+    def preprocess_image(self, image_path, segmentation_path=None):
+        image = Image.open(image_path)
+        if not image.mode == "RGB":
+            image = image.convert("RGB")
+        image = np.array(image).astype(np.uint8)
+        if segmentation_path:
+            segmentation = Image.open(segmentation_path)
+            if not self.onehot and not segmentation.mode == "RGB":
+                segmentation = segmentation.convert("RGB")
+            segmentation = np.array(segmentation).astype(np.uint8)
+            if self.onehot:
+                assert self.stuffthing
+                # stored in caffe format: unlabeled==255. stuff and thing from
+                # 0-181. to be compatible with the labels in
+                # https://github.com/nightrome/cocostuff/blob/master/labels.txt
+                # we shift stuffthing one to the right and put unlabeled in zero
+                # as long as segmentation is uint8 shifting to right handles the
+                # latter too
+                assert segmentation.dtype == np.uint8
+                segmentation = segmentation + 1
+
+            processed = self.preprocessor(image=image, segmentation=segmentation)
+
+            image, segmentation = processed["image"], processed["segmentation"]
+        else:
+            image = self.preprocessor(image=image,)['image']
+
+        image = (image / 127.5 - 1.0).astype(np.float32)
+        if segmentation_path:
+            if self.onehot:
+                assert segmentation.dtype == np.uint8
+                # make it one hot
+                n_labels = 183
+                flatseg = np.ravel(segmentation)
+                onehot = np.zeros((flatseg.size, n_labels), dtype=np.bool)
+                onehot[np.arange(flatseg.size), flatseg] = True
+                onehot = onehot.reshape(segmentation.shape + (n_labels,)).astype(int)
+                segmentation = onehot
+            else:
+                segmentation = (segmentation / 127.5 - 1.0).astype(np.float32)
+            return image, segmentation
+        else:
+            return image
+
+    def __getitem__(self, i):
+        img_path = self.img_id_to_filepath[self.labels["image_ids"][i]]
+        if self.use_segmenation:
+            seg_path = self.img_id_to_segmentation_filepath[self.labels["image_ids"][i]]
+            image, segmentation = self.preprocess_image(img_path, seg_path)
+        else:
+            image = self.preprocess_image(img_path)
+        captions = self.img_id_to_captions[self.labels["image_ids"][i]]
+        # randomly draw one of all available captions per image
+        caption = captions[np.random.randint(0, len(captions))]
+        example = {"image": image,
+                   #"caption": [str(caption[0])],
+                   "caption": caption,
+                   "img_path": img_path,
+                   "filename_": img_path.split(os.sep)[-1]
+                    }
+        if self.use_segmenation:
+            example.update({"seg_path": seg_path, 'segmentation': segmentation})
+        return example
+
+
+class CocoImagesAndCaptionsTrain2017(CocoBase):
+    """returns a pair of (image, caption)"""
+    def __init__(self, size, onehot_segmentation=False, use_stuffthing=False, crop_size=None, force_no_crop=False,):
+        super().__init__(size=size,
+                         dataroot="data/coco/train2017",
+                         datajson="data/coco/annotations/captions_train2017.json",
+                         onehot_segmentation=onehot_segmentation,
+                         use_stuffthing=use_stuffthing, crop_size=crop_size, force_no_crop=force_no_crop)
+
+    def get_split(self):
+        return "train"
+
+    def year(self):
+        return '2017'
+
+
+class CocoImagesAndCaptionsValidation2017(CocoBase):
+    """returns a pair of (image, caption)"""
+    def __init__(self, size, onehot_segmentation=False, use_stuffthing=False, crop_size=None, force_no_crop=False,
+                 given_files=None):
+        super().__init__(size=size,
+                         dataroot="data/coco/val2017",
+                         datajson="data/coco/annotations/captions_val2017.json",
+                         onehot_segmentation=onehot_segmentation,
+                         use_stuffthing=use_stuffthing, crop_size=crop_size, force_no_crop=force_no_crop,
+                         given_files=given_files)
+
+    def get_split(self):
+        return "validation"
+
+    def year(self):
+        return '2017'
+
+
+
+class CocoImagesAndCaptionsTrain2014(CocoBase):
+    """returns a pair of (image, caption)"""
+    def __init__(self, size, onehot_segmentation=False, use_stuffthing=False, crop_size=None, force_no_crop=False,crop_type='random'):
+        super().__init__(size=size,
+                         dataroot="data/coco/train2014",
+                         datajson="data/coco/annotations2014/annotations/captions_train2014.json",
+                         onehot_segmentation=onehot_segmentation,
+                         use_stuffthing=use_stuffthing, crop_size=crop_size, force_no_crop=force_no_crop,
+                         use_segmentation=False,
+                         crop_type=crop_type)
+
+    def get_split(self):
+        return "train"
+
+    def year(self):
+        return '2014'
+
+class CocoImagesAndCaptionsValidation2014(CocoBase):
+    """returns a pair of (image, caption)"""
+    def __init__(self, size, onehot_segmentation=False, use_stuffthing=False, crop_size=None, force_no_crop=False,
+                 given_files=None,crop_type='center',**kwargs):
+        super().__init__(size=size,
+                         dataroot="data/coco/val2014",
+                         datajson="data/coco/annotations2014/annotations/captions_val2014.json",
+                         onehot_segmentation=onehot_segmentation,
+                         use_stuffthing=use_stuffthing, crop_size=crop_size, force_no_crop=force_no_crop,
+                         given_files=given_files,
+                         use_segmentation=False,
+                         crop_type=crop_type)
+
+    def get_split(self):
+        return "validation"
+
+    def year(self):
+        return '2014'
+
+if __name__ == '__main__':
+    with open("data/coco/annotations2014/annotations/captions_val2014.json", "r") as json_file:
+        json_data = json.load(json_file)
+        capdirs = json_data["annotations"]
+        import pudb; pudb.set_trace()
+    #d2 = CocoImagesAndCaptionsTrain2014(size=256)
+    d2 = CocoImagesAndCaptionsValidation2014(size=256)
+    print("constructed dataset.")
+    print(f"length of {d2.__class__.__name__}: {len(d2)}")
+
+    ex2 = d2[0]
+    # ex3 = d3[0]
+    # print(ex1["image"].shape)
+    print(ex2["image"].shape)
+    # print(ex3["image"].shape)
+    # print(ex1["segmentation"].shape)
+    print(ex2["caption"].__class__.__name__)

ldm/data/dummy.py

@@ -0,0 +1,34 @@
+import numpy as np
+import random
+import string
+from torch.utils.data import Dataset, Subset
+
+class DummyData(Dataset):
+    def __init__(self, length, size):
+        self.length = length
+        self.size = size
+
+    def __len__(self):
+        return self.length
+
+    def __getitem__(self, i):
+        x = np.random.randn(*self.size)
+        letters = string.ascii_lowercase
+        y = ''.join(random.choice(string.ascii_lowercase) for i in range(10))
+        return {"jpg": x, "txt": y}
+
+
+class DummyDataWithEmbeddings(Dataset):
+    def __init__(self, length, size, emb_size):
+        self.length = length
+        self.size = size
+        self.emb_size = emb_size
+
+    def __len__(self):
+        return self.length
+
+    def __getitem__(self, i):
+        x = np.random.randn(*self.size)
+        y = np.random.randn(*self.emb_size).astype(np.float32)
+        return {"jpg": x, "txt": y}
+

ldm/data/imagenet.py

@@ -0,0 +1,394 @@
+import os, yaml, pickle, shutil, tarfile, glob
+import cv2
+import albumentations
+import PIL
+import numpy as np
+import torchvision.transforms.functional as TF
+from omegaconf import OmegaConf
+from functools import partial
+from PIL import Image
+from tqdm import tqdm
+from torch.utils.data import Dataset, Subset
+
+import taming.data.utils as tdu
+from taming.data.imagenet import str_to_indices, give_synsets_from_indices, download, retrieve
+from taming.data.imagenet import ImagePaths
+
+from ldm.modules.image_degradation import degradation_fn_bsr, degradation_fn_bsr_light
+
+
+def synset2idx(path_to_yaml="data/index_synset.yaml"):
+    with open(path_to_yaml) as f:
+        di2s = yaml.load(f)
+    return dict((v,k) for k,v in di2s.items())
+
+
+class ImageNetBase(Dataset):
+    def __init__(self, config=None):
+        self.config = config or OmegaConf.create()
+        if not type(self.config)==dict:
+            self.config = OmegaConf.to_container(self.config)
+        self.keep_orig_class_label = self.config.get("keep_orig_class_label", False)
+        self.process_images = True  # if False we skip loading & processing images and self.data contains filepaths
+        self._prepare()
+        self._prepare_synset_to_human()
+        self._prepare_idx_to_synset()
+        self._prepare_human_to_integer_label()
+        self._load()
+
+    def __len__(self):
+        return len(self.data)
+
+    def __getitem__(self, i):
+        return self.data[i]
+
+    def _prepare(self):
+        raise NotImplementedError()
+
+    def _filter_relpaths(self, relpaths):
+        ignore = set([
+            "n06596364_9591.JPEG",
+        ])
+        relpaths = [rpath for rpath in relpaths if not rpath.split("/")[-1] in ignore]
+        if "sub_indices" in self.config:
+            indices = str_to_indices(self.config["sub_indices"])
+            synsets = give_synsets_from_indices(indices, path_to_yaml=self.idx2syn)  # returns a list of strings
+            self.synset2idx = synset2idx(path_to_yaml=self.idx2syn)
+            files = []
+            for rpath in relpaths:
+                syn = rpath.split("/")[0]
+                if syn in synsets:
+                    files.append(rpath)
+            return files
+        else:
+            return relpaths
+
+    def _prepare_synset_to_human(self):
+        SIZE = 2655750
+        URL = "https://heibox.uni-heidelberg.de/f/9f28e956cd304264bb82/?dl=1"
+        self.human_dict = os.path.join(self.root, "synset_human.txt")
+        if (not os.path.exists(self.human_dict) or
+                not os.path.getsize(self.human_dict)==SIZE):
+            download(URL, self.human_dict)
+
+    def _prepare_idx_to_synset(self):
+        URL = "https://heibox.uni-heidelberg.de/f/d835d5b6ceda4d3aa910/?dl=1"
+        self.idx2syn = os.path.join(self.root, "index_synset.yaml")
+        if (not os.path.exists(self.idx2syn)):
+            download(URL, self.idx2syn)
+
+    def _prepare_human_to_integer_label(self):
+        URL = "https://heibox.uni-heidelberg.de/f/2362b797d5be43b883f6/?dl=1"
+        self.human2integer = os.path.join(self.root, "imagenet1000_clsidx_to_labels.txt")
+        if (not os.path.exists(self.human2integer)):
+            download(URL, self.human2integer)
+        with open(self.human2integer, "r") as f:
+            lines = f.read().splitlines()
+            assert len(lines) == 1000
+            self.human2integer_dict = dict()
+            for line in lines:
+                value, key = line.split(":")
+                self.human2integer_dict[key] = int(value)
+
+    def _load(self):
+        with open(self.txt_filelist, "r") as f:
+            self.relpaths = f.read().splitlines()
+            l1 = len(self.relpaths)
+            self.relpaths = self._filter_relpaths(self.relpaths)
+            print("Removed {} files from filelist during filtering.".format(l1 - len(self.relpaths)))
+
+        self.synsets = [p.split("/")[0] for p in self.relpaths]
+        self.abspaths = [os.path.join(self.datadir, p) for p in self.relpaths]
+
+        unique_synsets = np.unique(self.synsets)
+        class_dict = dict((synset, i) for i, synset in enumerate(unique_synsets))
+        if not self.keep_orig_class_label:
+            self.class_labels = [class_dict[s] for s in self.synsets]
+        else:
+            self.class_labels = [self.synset2idx[s] for s in self.synsets]
+
+        with open(self.human_dict, "r") as f:
+            human_dict = f.read().splitlines()
+            human_dict = dict(line.split(maxsplit=1) for line in human_dict)
+
+        self.human_labels = [human_dict[s] for s in self.synsets]
+
+        labels = {
+            "relpath": np.array(self.relpaths),
+            "synsets": np.array(self.synsets),
+            "class_label": np.array(self.class_labels),
+            "human_label": np.array(self.human_labels),
+        }
+
+        if self.process_images:
+            self.size = retrieve(self.config, "size", default=256)
+            self.data = ImagePaths(self.abspaths,
+                                   labels=labels,
+                                   size=self.size,
+                                   random_crop=self.random_crop,
+                                   )
+        else:
+            self.data = self.abspaths
+
+
+class ImageNetTrain(ImageNetBase):
+    NAME = "ILSVRC2012_train"
+    URL = "http://www.image-net.org/challenges/LSVRC/2012/"
+    AT_HASH = "a306397ccf9c2ead27155983c254227c0fd938e2"
+    FILES = [
+        "ILSVRC2012_img_train.tar",
+    ]
+    SIZES = [
+        147897477120,
+    ]
+
+    def __init__(self, process_images=True, data_root=None, **kwargs):
+        self.process_images = process_images
+        self.data_root = data_root
+        super().__init__(**kwargs)
+
+    def _prepare(self):
+        if self.data_root:
+            self.root = os.path.join(self.data_root, self.NAME)
+        else:
+            cachedir = os.environ.get("XDG_CACHE_HOME", os.path.expanduser("~/.cache"))
+            self.root = os.path.join(cachedir, "autoencoders/data", self.NAME)
+
+        self.datadir = os.path.join(self.root, "data")
+        self.txt_filelist = os.path.join(self.root, "filelist.txt")
+        self.expected_length = 1281167
+        self.random_crop = retrieve(self.config, "ImageNetTrain/random_crop",
+                                    default=True)
+        if not tdu.is_prepared(self.root):
+            # prep
+            print("Preparing dataset {} in {}".format(self.NAME, self.root))
+
+            datadir = self.datadir
+            if not os.path.exists(datadir):
+                path = os.path.join(self.root, self.FILES[0])
+                if not os.path.exists(path) or not os.path.getsize(path)==self.SIZES[0]:
+                    import academictorrents as at
+                    atpath = at.get(self.AT_HASH, datastore=self.root)
+                    assert atpath == path
+
+                print("Extracting {} to {}".format(path, datadir))
+                os.makedirs(datadir, exist_ok=True)
+                with tarfile.open(path, "r:") as tar:
+                    tar.extractall(path=datadir)
+
+                print("Extracting sub-tars.")
+                subpaths = sorted(glob.glob(os.path.join(datadir, "*.tar")))
+                for subpath in tqdm(subpaths):
+                    subdir = subpath[:-len(".tar")]
+                    os.makedirs(subdir, exist_ok=True)
+                    with tarfile.open(subpath, "r:") as tar:
+                        tar.extractall(path=subdir)
+
+            filelist = glob.glob(os.path.join(datadir, "**", "*.JPEG"))
+            filelist = [os.path.relpath(p, start=datadir) for p in filelist]
+            filelist = sorted(filelist)
+            filelist = "\n".join(filelist)+"\n"
+            with open(self.txt_filelist, "w") as f:
+                f.write(filelist)
+
+            tdu.mark_prepared(self.root)
+
+
+class ImageNetValidation(ImageNetBase):
+    NAME = "ILSVRC2012_validation"
+    URL = "http://www.image-net.org/challenges/LSVRC/2012/"
+    AT_HASH = "5d6d0df7ed81efd49ca99ea4737e0ae5e3a5f2e5"
+    VS_URL = "https://heibox.uni-heidelberg.de/f/3e0f6e9c624e45f2bd73/?dl=1"
+    FILES = [
+        "ILSVRC2012_img_val.tar",
+        "validation_synset.txt",
+    ]
+    SIZES = [
+        6744924160,
+        1950000,
+    ]
+
+    def __init__(self, process_images=True, data_root=None, **kwargs):
+        self.data_root = data_root
+        self.process_images = process_images
+        super().__init__(**kwargs)
+
+    def _prepare(self):
+        if self.data_root:
+            self.root = os.path.join(self.data_root, self.NAME)
+        else:
+            cachedir = os.environ.get("XDG_CACHE_HOME", os.path.expanduser("~/.cache"))
+            self.root = os.path.join(cachedir, "autoencoders/data", self.NAME)
+        self.datadir = os.path.join(self.root, "data")
+        self.txt_filelist = os.path.join(self.root, "filelist.txt")
+        self.expected_length = 50000
+        self.random_crop = retrieve(self.config, "ImageNetValidation/random_crop",
+                                    default=False)
+        if not tdu.is_prepared(self.root):
+            # prep
+            print("Preparing dataset {} in {}".format(self.NAME, self.root))
+
+            datadir = self.datadir
+            if not os.path.exists(datadir):
+                path = os.path.join(self.root, self.FILES[0])
+                if not os.path.exists(path) or not os.path.getsize(path)==self.SIZES[0]:
+                    import academictorrents as at
+                    atpath = at.get(self.AT_HASH, datastore=self.root)
+                    assert atpath == path
+
+                print("Extracting {} to {}".format(path, datadir))
+                os.makedirs(datadir, exist_ok=True)
+                with tarfile.open(path, "r:") as tar:
+                    tar.extractall(path=datadir)
+
+                vspath = os.path.join(self.root, self.FILES[1])
+                if not os.path.exists(vspath) or not os.path.getsize(vspath)==self.SIZES[1]:
+                    download(self.VS_URL, vspath)
+
+                with open(vspath, "r") as f:
+                    synset_dict = f.read().splitlines()
+                    synset_dict = dict(line.split() for line in synset_dict)
+
+                print("Reorganizing into synset folders")
+                synsets = np.unique(list(synset_dict.values()))
+                for s in synsets:
+                    os.makedirs(os.path.join(datadir, s), exist_ok=True)
+                for k, v in synset_dict.items():
+                    src = os.path.join(datadir, k)
+                    dst = os.path.join(datadir, v)
+                    shutil.move(src, dst)
+
+            filelist = glob.glob(os.path.join(datadir, "**", "*.JPEG"))
+            filelist = [os.path.relpath(p, start=datadir) for p in filelist]
+            filelist = sorted(filelist)
+            filelist = "\n".join(filelist)+"\n"
+            with open(self.txt_filelist, "w") as f:
+                f.write(filelist)
+
+            tdu.mark_prepared(self.root)
+
+
+
+class ImageNetSR(Dataset):
+    def __init__(self, size=None,
+                 degradation=None, downscale_f=4, min_crop_f=0.5, max_crop_f=1.,
+                 random_crop=True):
+        """
+        Imagenet Superresolution Dataloader
+        Performs following ops in order:
+        1.  crops a crop of size s from image either as random or center crop
+        2.  resizes crop to size with cv2.area_interpolation
+        3.  degrades resized crop with degradation_fn
+
+        :param size: resizing to size after cropping
+        :param degradation: degradation_fn, e.g. cv_bicubic or bsrgan_light
+        :param downscale_f: Low Resolution Downsample factor
+        :param min_crop_f: determines crop size s,
+          where s = c * min_img_side_len with c sampled from interval (min_crop_f, max_crop_f)
+        :param max_crop_f: ""
+        :param data_root:
+        :param random_crop:
+        """
+        self.base = self.get_base()
+        assert size
+        assert (size / downscale_f).is_integer()
+        self.size = size
+        self.LR_size = int(size / downscale_f)
+        self.min_crop_f = min_crop_f
+        self.max_crop_f = max_crop_f
+        assert(max_crop_f <= 1.)
+        self.center_crop = not random_crop
+
+        self.image_rescaler = albumentations.SmallestMaxSize(max_size=size, interpolation=cv2.INTER_AREA)
+
+        self.pil_interpolation = False # gets reset later if incase interp_op is from pillow
+
+        if degradation == "bsrgan":
+            self.degradation_process = partial(degradation_fn_bsr, sf=downscale_f)
+
+        elif degradation == "bsrgan_light":
+            self.degradation_process = partial(degradation_fn_bsr_light, sf=downscale_f)
+
+        else:
+            interpolation_fn = {
+            "cv_nearest": cv2.INTER_NEAREST,
+            "cv_bilinear": cv2.INTER_LINEAR,
+            "cv_bicubic": cv2.INTER_CUBIC,
+            "cv_area": cv2.INTER_AREA,
+            "cv_lanczos": cv2.INTER_LANCZOS4,
+            "pil_nearest": PIL.Image.NEAREST,
+            "pil_bilinear": PIL.Image.BILINEAR,
+            "pil_bicubic": PIL.Image.BICUBIC,
+            "pil_box": PIL.Image.BOX,
+            "pil_hamming": PIL.Image.HAMMING,
+            "pil_lanczos": PIL.Image.LANCZOS,
+            }[degradation]
+
+            self.pil_interpolation = degradation.startswith("pil_")
+
+            if self.pil_interpolation:
+                self.degradation_process = partial(TF.resize, size=self.LR_size, interpolation=interpolation_fn)
+
+            else:
+                self.degradation_process = albumentations.SmallestMaxSize(max_size=self.LR_size,
+                                                                          interpolation=interpolation_fn)
+
+    def __len__(self):
+        return len(self.base)
+
+    def __getitem__(self, i):
+        example = self.base[i]
+        image = Image.open(example["file_path_"])
+
+        if not image.mode == "RGB":
+            image = image.convert("RGB")
+
+        image = np.array(image).astype(np.uint8)
+
+        min_side_len = min(image.shape[:2])
+        crop_side_len = min_side_len * np.random.uniform(self.min_crop_f, self.max_crop_f, size=None)
+        crop_side_len = int(crop_side_len)
+
+        if self.center_crop:
+            self.cropper = albumentations.CenterCrop(height=crop_side_len, width=crop_side_len)
+
+        else:
+            self.cropper = albumentations.RandomCrop(height=crop_side_len, width=crop_side_len)
+
+        image = self.cropper(image=image)["image"]
+        image = self.image_rescaler(image=image)["image"]
+
+        if self.pil_interpolation:
+            image_pil = PIL.Image.fromarray(image)
+            LR_image = self.degradation_process(image_pil)
+            LR_image = np.array(LR_image).astype(np.uint8)
+
+        else:
+            LR_image = self.degradation_process(image=image)["image"]
+
+        example["image"] = (image/127.5 - 1.0).astype(np.float32)
+        example["LR_image"] = (LR_image/127.5 - 1.0).astype(np.float32)
+        example["caption"] = example["human_label"]  # dummy caption
+        return example
+
+
+class ImageNetSRTrain(ImageNetSR):
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+
+    def get_base(self):
+        with open("data/imagenet_train_hr_indices.p", "rb") as f:
+            indices = pickle.load(f)
+        dset = ImageNetTrain(process_images=False,)
+        return Subset(dset, indices)
+
+
+class ImageNetSRValidation(ImageNetSR):
+    def __init__(self, **kwargs):
+        super().__init__(**kwargs)
+
+    def get_base(self):
+        with open("data/imagenet_val_hr_indices.p", "rb") as f:
+            indices = pickle.load(f)
+        dset = ImageNetValidation(process_images=False,)
+        return Subset(dset, indices)

ldm/data/inpainting/synthetic_mask.py

@@ -0,0 +1,166 @@
+from PIL import Image, ImageDraw
+import numpy as np
+
+settings = {
+    "256narrow": {
+        "p_irr": 1,
+        "min_n_irr": 4,
+        "max_n_irr": 50,
+        "max_l_irr": 40,
+        "max_w_irr": 10,
+        "min_n_box": None,
+        "max_n_box": None,
+        "min_s_box": None,
+        "max_s_box": None,
+        "marg": None,
+    },
+    "256train": {
+        "p_irr": 0.5,
+        "min_n_irr": 1,
+        "max_n_irr": 5,
+        "max_l_irr": 200,
+        "max_w_irr": 100,
+        "min_n_box": 1,
+        "max_n_box": 4,
+        "min_s_box": 30,
+        "max_s_box": 150,
+        "marg": 10,
+    },
+    "512train": {    # TODO: experimental
+            "p_irr": 0.5,
+            "min_n_irr": 1,
+            "max_n_irr": 5,
+            "max_l_irr": 450,
+            "max_w_irr": 250,
+            "min_n_box": 1,
+            "max_n_box": 4,
+            "min_s_box": 30,
+            "max_s_box": 300,
+            "marg": 10,
+        },
+    "512train-large": {    # TODO: experimental
+            "p_irr": 0.5,
+            "min_n_irr": 1,
+            "max_n_irr": 5,
+            "max_l_irr": 450,
+            "max_w_irr": 400,
+            "min_n_box": 1,
+            "max_n_box": 4,
+            "min_s_box": 75,
+            "max_s_box": 450,
+            "marg": 10,
+        },
+}
+
+
+def gen_segment_mask(mask, start, end, brush_width):
+    mask = mask > 0
+    mask = (255 * mask).astype(np.uint8)
+    mask = Image.fromarray(mask)
+    draw = ImageDraw.Draw(mask)
+    draw.line([start, end], fill=255, width=brush_width, joint="curve")
+    mask = np.array(mask) / 255
+    return mask
+
+
+def gen_box_mask(mask, masked):
+    x_0, y_0, w, h = masked
+    mask[y_0:y_0 + h, x_0:x_0 + w] = 1
+    return mask
+
+
+def gen_round_mask(mask, masked, radius):
+    x_0, y_0, w, h = masked
+    xy = [(x_0, y_0), (x_0 + w, y_0 + w)]
+
+    mask = mask > 0
+    mask = (255 * mask).astype(np.uint8)
+    mask = Image.fromarray(mask)
+    draw = ImageDraw.Draw(mask)
+    draw.rounded_rectangle(xy, radius=radius, fill=255)
+    mask = np.array(mask) / 255
+    return mask
+
+
+def gen_large_mask(prng, img_h, img_w,
+                   marg, p_irr, min_n_irr, max_n_irr, max_l_irr, max_w_irr,
+                   min_n_box, max_n_box, min_s_box, max_s_box):
+    """
+    img_h: int, an image height
+    img_w: int, an image width
+    marg: int, a margin for a box starting coordinate
+    p_irr: float, 0 <= p_irr <= 1, a probability of a polygonal chain mask
+
+    min_n_irr: int, min number of segments
+    max_n_irr: int, max number of segments
+    max_l_irr: max length of a segment in polygonal chain
+    max_w_irr: max width of a segment in polygonal chain
+
+    min_n_box: int, min bound for the number of box primitives
+    max_n_box: int, max bound for the number of box primitives
+    min_s_box: int, min length of a box side
+    max_s_box: int, max length of a box side
+    """
+
+    mask = np.zeros((img_h, img_w))
+    uniform = prng.randint
+
+    if np.random.uniform(0, 1) < p_irr:  # generate polygonal chain
+        n = uniform(min_n_irr, max_n_irr)  # sample number of segments
+
+        for _ in range(n):
+            y = uniform(0, img_h)  # sample a starting point
+            x = uniform(0, img_w)
+
+            a = uniform(0, 360)  # sample angle
+            l = uniform(10, max_l_irr)  # sample segment length
+            w = uniform(5, max_w_irr)  # sample a segment width
+
+            # draw segment starting from (x,y) to (x_,y_) using brush of width w
+            x_ = x + l * np.sin(a)
+            y_ = y + l * np.cos(a)
+
+            mask = gen_segment_mask(mask, start=(x, y), end=(x_, y_), brush_width=w)
+            x, y = x_, y_
+    else:  # generate Box masks
+        n = uniform(min_n_box, max_n_box)  # sample number of rectangles
+
+        for _ in range(n):
+            h = uniform(min_s_box, max_s_box)  # sample box shape
+            w = uniform(min_s_box, max_s_box)
+
+            x_0 = uniform(marg, img_w - marg - w)  # sample upper-left coordinates of box
+            y_0 = uniform(marg, img_h - marg - h)
+
+            if np.random.uniform(0, 1) < 0.5:
+                mask = gen_box_mask(mask, masked=(x_0, y_0, w, h))
+            else:
+                r = uniform(0, 60)  # sample radius
+                mask = gen_round_mask(mask, masked=(x_0, y_0, w, h), radius=r)
+    return mask
+
+
+make_lama_mask = lambda prng, h, w: gen_large_mask(prng, h, w, **settings["256train"])
+make_narrow_lama_mask = lambda prng, h, w: gen_large_mask(prng, h, w, **settings["256narrow"])
+make_512_lama_mask = lambda prng, h, w: gen_large_mask(prng, h, w, **settings["512train"])
+make_512_lama_mask_large = lambda prng, h, w: gen_large_mask(prng, h, w, **settings["512train-large"])
+
+
+MASK_MODES = {
+    "256train": make_lama_mask,
+    "256narrow": make_narrow_lama_mask,
+    "512train": make_512_lama_mask,
+    "512train-large": make_512_lama_mask_large
+}
+
+if __name__ == "__main__":
+    import sys
+
+    out = sys.argv[1]
+
+    prng = np.random.RandomState(1)
+    kwargs = settings["256train"]
+    mask = gen_large_mask(prng, 256, 256, **kwargs)
+    mask = (255 * mask).astype(np.uint8)
+    mask = Image.fromarray(mask)
+    mask.save(out)

ldm/data/laion.py

@@ -0,0 +1,537 @@
+import webdataset as wds
+import kornia
+from PIL import Image
+import io
+import os
+import torchvision
+from PIL import Image
+import glob
+import random
+import numpy as np
+import pytorch_lightning as pl
+from tqdm import tqdm
+from omegaconf import OmegaConf
+from einops import rearrange
+import torch
+from webdataset.handlers import warn_and_continue
+
+
+from ldm.util import instantiate_from_config
+from ldm.data.inpainting.synthetic_mask import gen_large_mask, MASK_MODES
+from ldm.data.base import PRNGMixin
+
+
+class DataWithWings(torch.utils.data.IterableDataset):
+    def __init__(self, min_size, transform=None, target_transform=None):
+        self.min_size = min_size
+        self.transform = transform if transform is not None else nn.Identity()
+        self.target_transform = target_transform if target_transform is not None else nn.Identity()
+        self.kv = OnDiskKV(file='/home/ubuntu/laion5B-watermark-safety-ordered', key_format='q', value_format='ee')
+        self.kv_aesthetic = OnDiskKV(file='/home/ubuntu/laion5B-aesthetic-tags-kv', key_format='q', value_format='e')
+        self.pwatermark_threshold = 0.8
+        self.punsafe_threshold = 0.5
+        self.aesthetic_threshold = 5.
+        self.total_samples = 0
+        self.samples = 0
+        location = 'pipe:aws s3 cp --quiet s3://s-datasets/laion5b/laion2B-data/{000000..231349}.tar -'
+
+        self.inner_dataset = wds.DataPipeline(
+            wds.ResampledShards(location),
+            wds.tarfile_to_samples(handler=wds.warn_and_continue),
+            wds.shuffle(1000, handler=wds.warn_and_continue),
+            wds.decode('pilrgb', handler=wds.warn_and_continue),
+            wds.map(self._add_tags, handler=wds.ignore_and_continue),
+            wds.select(self._filter_predicate),
+            wds.map_dict(jpg=self.transform, txt=self.target_transform, punsafe=self._punsafe_to_class, handler=wds.warn_and_continue),
+            wds.to_tuple('jpg', 'txt', 'punsafe', handler=wds.warn_and_continue),
+        )
+
+    @staticmethod
+    def _compute_hash(url, text):
+        if url is None:
+            url = ''
+        if text is None:
+            text = ''
+        total = (url + text).encode('utf-8')
+        return mmh3.hash64(total)[0]
+
+    def _add_tags(self, x):
+        hsh = self._compute_hash(x['json']['url'], x['txt'])
+        pwatermark, punsafe = self.kv[hsh]
+        aesthetic = self.kv_aesthetic[hsh][0]
+        return {**x, 'pwatermark': pwatermark, 'punsafe': punsafe, 'aesthetic': aesthetic}
+
+    def _punsafe_to_class(self, punsafe):
+        return torch.tensor(punsafe >= self.punsafe_threshold).long()
+
+    def _filter_predicate(self, x):
+        try:
+            return x['pwatermark'] < self.pwatermark_threshold and x['aesthetic'] >= self.aesthetic_threshold and x['json']['original_width'] >= self.min_size and x['json']['original_height'] >= self.min_size
+        except:
+            return False
+
+    def __iter__(self):
+        return iter(self.inner_dataset)
+
+
+def dict_collation_fn(samples, combine_tensors=True, combine_scalars=True):
+    """Take a list  of samples (as dictionary) and create a batch, preserving the keys.
+    If `tensors` is True, `ndarray` objects are combined into
+    tensor batches.
+    :param dict samples: list of samples
+    :param bool tensors: whether to turn lists of ndarrays into a single ndarray
+    :returns: single sample consisting of a batch
+    :rtype: dict
+    """
+    keys = set.intersection(*[set(sample.keys()) for sample in samples])
+    batched = {key: [] for key in keys}
+
+    for s in samples:
+        [batched[key].append(s[key]) for key in batched]
+
+    result = {}
+    for key in batched:
+        if isinstance(batched[key][0], (int, float)):
+            if combine_scalars:
+                result[key] = np.array(list(batched[key]))
+        elif isinstance(batched[key][0], torch.Tensor):
+            if combine_tensors:
+                result[key] = torch.stack(list(batched[key]))
+        elif isinstance(batched[key][0], np.ndarray):
+            if combine_tensors:
+                result[key] = np.array(list(batched[key]))
+        else:
+            result[key] = list(batched[key])
+    return result
+
+
+class WebDataModuleFromConfig(pl.LightningDataModule):
+    def __init__(self, tar_base, batch_size, train=None, validation=None,
+                 test=None, num_workers=4, multinode=True, min_size=None,
+                 max_pwatermark=1.0,
+                 **kwargs):
+        super().__init__(self)
+        print(f'Setting tar base to {tar_base}')
+        self.tar_base = tar_base
+        self.batch_size = batch_size
+        self.num_workers = num_workers
+        self.train = train
+        self.validation = validation
+        self.test = test
+        self.multinode = multinode
+        self.min_size = min_size  # filter out very small images
+        self.max_pwatermark = max_pwatermark # filter out watermarked images
+
+    def make_loader(self, dataset_config, train=True):
+        if 'image_transforms' in dataset_config:
+            image_transforms = [instantiate_from_config(tt) for tt in dataset_config.image_transforms]
+        else:
+            image_transforms = []
+
+        image_transforms.extend([torchvision.transforms.ToTensor(),
+                                 torchvision.transforms.Lambda(lambda x: rearrange(x * 2. - 1., 'c h w -> h w c'))])
+        image_transforms = torchvision.transforms.Compose(image_transforms)
+
+        if 'transforms' in dataset_config:
+            transforms_config = OmegaConf.to_container(dataset_config.transforms)
+        else:
+            transforms_config = dict()
+
+        transform_dict = {dkey: load_partial_from_config(transforms_config[dkey])
+                if transforms_config[dkey] != 'identity' else identity
+                for dkey in transforms_config}
+        img_key = dataset_config.get('image_key', 'jpeg')
+        transform_dict.update({img_key: image_transforms})
+
+        if 'postprocess' in dataset_config:
+            postprocess = instantiate_from_config(dataset_config['postprocess'])
+        else:
+            postprocess = None
+
+        shuffle = dataset_config.get('shuffle', 0)
+        shardshuffle = shuffle > 0
+
+        nodesplitter = wds.shardlists.split_by_node if self.multinode else wds.shardlists.single_node_only
+
+        if self.tar_base == "__improvedaesthetic__":
+            print("## Warning, loading the same improved aesthetic dataset "
+                    "for all splits and ignoring shards parameter.")
+            tars = "pipe:aws s3 cp s3://s-laion/improved-aesthetics-laion-2B-en-subsets/aesthetics_tars/{000000..060207}.tar -"
+        else:
+            tars = os.path.join(self.tar_base, dataset_config.shards)
+
+        dset = wds.WebDataset(
+                tars,
+                nodesplitter=nodesplitter,
+                shardshuffle=shardshuffle,
+                handler=wds.warn_and_continue).repeat().shuffle(shuffle)
+        print(f'Loading webdataset with {len(dset.pipeline[0].urls)} shards.')
+
+        dset = (dset
+                .select(self.filter_keys)
+                .decode('pil', handler=wds.warn_and_continue)
+                .select(self.filter_size)
+                .map_dict(**transform_dict, handler=wds.warn_and_continue)
+                )
+        if postprocess is not None:
+            dset = dset.map(postprocess)
+        dset = (dset
+                .batched(self.batch_size, partial=False,
+                    collation_fn=dict_collation_fn)
+                )
+
+        loader = wds.WebLoader(dset, batch_size=None, shuffle=False,
+                               num_workers=self.num_workers)
+
+        return loader
+
+    def filter_size(self, x):
+        try:
+            valid = True
+            if self.min_size is not None and self.min_size > 1:
+                try:
+                    valid = valid and x['json']['original_width'] >= self.min_size and x['json']['original_height'] >= self.min_size
+                except Exception:
+                    valid = False
+            if self.max_pwatermark is not None and self.max_pwatermark < 1.0:
+                try:
+                    valid = valid and  x['json']['pwatermark'] <= self.max_pwatermark
+                except Exception:
+                    valid = False
+            return valid
+        except Exception:
+            return False
+
+    def filter_keys(self, x):
+        try:
+            return ("jpg" in x) and ("txt" in x)
+        except Exception:
+            return False
+
+    def train_dataloader(self):
+        return self.make_loader(self.train)
+
+    def val_dataloader(self):
+        return self.make_loader(self.validation, train=False)
+
+    def test_dataloader(self):
+        return self.make_loader(self.test, train=False)
+
+
+from ldm.modules.image_degradation import degradation_fn_bsr_light
+import cv2
+
+class AddLR(object):
+    def __init__(self, factor, output_size, initial_size=None, image_key="jpg"):
+        self.factor = factor
+        self.output_size = output_size
+        self.image_key = image_key
+        self.initial_size = initial_size
+
+    def pt2np(self, x):
+        x = ((x+1.0)*127.5).clamp(0, 255).to(dtype=torch.uint8).detach().cpu().numpy()
+        return x
+
+    def np2pt(self, x):
+        x = torch.from_numpy(x)/127.5-1.0
+        return x
+
+    def __call__(self, sample):
+        # sample['jpg'] is tensor hwc in [-1, 1] at this point
+        x = self.pt2np(sample[self.image_key])
+        if self.initial_size is not None:
+            x = cv2.resize(x, (self.initial_size, self.initial_size), interpolation=2)
+        x = degradation_fn_bsr_light(x, sf=self.factor)['image']
+        x = cv2.resize(x, (self.output_size, self.output_size), interpolation=2)
+        x = self.np2pt(x)
+        sample['lr'] = x
+        return sample
+
+class AddBW(object):
+    def __init__(self, image_key="jpg"):
+        self.image_key = image_key
+
+    def pt2np(self, x):
+        x = ((x+1.0)*127.5).clamp(0, 255).to(dtype=torch.uint8).detach().cpu().numpy()
+        return x
+
+    def np2pt(self, x):
+        x = torch.from_numpy(x)/127.5-1.0
+        return x
+
+    def __call__(self, sample):
+        # sample['jpg'] is tensor hwc in [-1, 1] at this point
+        x = sample[self.image_key]
+        w = torch.rand(3, device=x.device)
+        w /= w.sum()
+        out = torch.einsum('hwc,c->hw', x, w)
+
+        # Keep as 3ch so we can pass to encoder, also we might want to add hints
+        sample['lr'] = out.unsqueeze(-1).tile(1,1,3)
+        return sample
+
+class AddMask(PRNGMixin):
+    def __init__(self, mode="512train", p_drop=0.):
+        super().__init__()
+        assert mode in list(MASK_MODES.keys()), f'unknown mask generation mode "{mode}"'
+        self.make_mask = MASK_MODES[mode]
+        self.p_drop = p_drop
+
+    def __call__(self, sample):
+        # sample['jpg'] is tensor hwc in [-1, 1] at this point
+        x = sample['jpg']
+        mask = self.make_mask(self.prng, x.shape[0], x.shape[1])
+        if self.prng.choice(2, p=[1 - self.p_drop, self.p_drop]):
+            mask = np.ones_like(mask)
+        mask[mask < 0.5] = 0
+        mask[mask > 0.5] = 1
+        mask = torch.from_numpy(mask[..., None])
+        sample['mask'] = mask
+        sample['masked_image'] = x * (mask < 0.5)
+        return sample
+
+
+class AddEdge(PRNGMixin):
+    def __init__(self, mode="512train", mask_edges=True):
+        super().__init__()
+        assert mode in list(MASK_MODES.keys()), f'unknown mask generation mode "{mode}"'
+        self.make_mask = MASK_MODES[mode]
+        self.n_down_choices = [0]
+        self.sigma_choices = [1, 2]
+        self.mask_edges = mask_edges
+
+    @torch.no_grad()
+    def __call__(self, sample):
+        # sample['jpg'] is tensor hwc in [-1, 1] at this point
+        x = sample['jpg']
+
+        mask = self.make_mask(self.prng, x.shape[0], x.shape[1])
+        mask[mask < 0.5] = 0
+        mask[mask > 0.5] = 1
+        mask = torch.from_numpy(mask[..., None])
+        sample['mask'] = mask
+
+        n_down_idx = self.prng.choice(len(self.n_down_choices))
+        sigma_idx = self.prng.choice(len(self.sigma_choices))
+
+        n_choices = len(self.n_down_choices)*len(self.sigma_choices)
+        raveled_idx = np.ravel_multi_index((n_down_idx, sigma_idx),
+                                           (len(self.n_down_choices), len(self.sigma_choices)))
+        normalized_idx = raveled_idx/max(1, n_choices-1)
+
+        n_down = self.n_down_choices[n_down_idx]
+        sigma = self.sigma_choices[sigma_idx]
+
+        kernel_size = 4*sigma+1
+        kernel_size = (kernel_size, kernel_size)
+        sigma = (sigma, sigma)
+        canny = kornia.filters.Canny(
+                low_threshold=0.1,
+                high_threshold=0.2,
+                kernel_size=kernel_size,
+                sigma=sigma,
+                hysteresis=True,
+                )
+        y = (x+1.0)/2.0 # in 01
+        y = y.unsqueeze(0).permute(0, 3, 1, 2).contiguous()
+
+        # down
+        for i_down in range(n_down):
+            size = min(y.shape[-2], y.shape[-1])//2
+            y = kornia.geometry.transform.resize(y, size, antialias=True)
+
+        # edge
+        _, y = canny(y)
+
+        if n_down > 0:
+            size = x.shape[0], x.shape[1]
+            y = kornia.geometry.transform.resize(y, size, interpolation="nearest")
+
+        y = y.permute(0, 2, 3, 1)[0].expand(-1, -1, 3).contiguous()
+        y = y*2.0-1.0
+
+        if self.mask_edges:
+            sample['masked_image'] = y * (mask < 0.5)
+        else:
+            sample['masked_image'] = y
+            sample['mask'] = torch.zeros_like(sample['mask'])
+
+        # concat normalized idx
+        sample['smoothing_strength'] = torch.ones_like(sample['mask'])*normalized_idx
+
+        return sample
+
+
+def example00():
+    url = "pipe:aws s3 cp s3://s-datasets/laion5b/laion2B-data/000000.tar -"
+    dataset = wds.WebDataset(url)
+    example = next(iter(dataset))
+    for k in example:
+        print(k, type(example[k]))
+
+    print(example["__key__"])
+    for k in ["json", "txt"]:
+        print(example[k].decode())
+
+    image = Image.open(io.BytesIO(example["jpg"]))
+    outdir = "tmp"
+    os.makedirs(outdir, exist_ok=True)
+    image.save(os.path.join(outdir, example["__key__"] + ".png"))
+
+
+    def load_example(example):
+        return {
+            "key": example["__key__"],
+            "image": Image.open(io.BytesIO(example["jpg"])),
+            "text": example["txt"].decode(),
+        }
+
+
+    for i, example in tqdm(enumerate(dataset)):
+        ex = load_example(example)
+        print(ex["image"].size, ex["text"])
+        if i >= 100:
+            break
+
+
+def example01():
+    # the first laion shards contain ~10k examples each
+    url = "pipe:aws s3 cp s3://s-datasets/laion5b/laion2B-data/{000000..000002}.tar -"
+
+    batch_size = 3
+    shuffle_buffer = 10000
+    dset = wds.WebDataset(
+            url,
+            nodesplitter=wds.shardlists.split_by_node,
+            shardshuffle=True,
+            )
+    dset = (dset
+            .shuffle(shuffle_buffer, initial=shuffle_buffer)
+            .decode('pil', handler=warn_and_continue)
+            .batched(batch_size, partial=False,
+                collation_fn=dict_collation_fn)
+            )
+
+    num_workers = 2
+    loader = wds.WebLoader(dset, batch_size=None, shuffle=False, num_workers=num_workers)
+
+    batch_sizes = list()
+    keys_per_epoch = list()
+    for epoch in range(5):
+        keys = list()
+        for batch in tqdm(loader):
+            batch_sizes.append(len(batch["__key__"]))
+            keys.append(batch["__key__"])
+
+        for bs in batch_sizes:
+            assert bs==batch_size
+        print(f"{len(batch_sizes)} batches of size {batch_size}.")
+        batch_sizes = list()
+
+        keys_per_epoch.append(keys)
+        for i_batch in [0, 1, -1]:
+            print(f"Batch {i_batch} of epoch {epoch}:")
+            print(keys[i_batch])
+        print("next epoch.")
+
+
+def example02():
+    from omegaconf import OmegaConf
+    from torch.utils.data.distributed import DistributedSampler
+    from torch.utils.data import IterableDataset
+    from torch.utils.data import DataLoader, RandomSampler, Sampler, SequentialSampler
+    from pytorch_lightning.trainer.supporters import CombinedLoader, CycleIterator
+
+    #config = OmegaConf.load("configs/stable-diffusion/txt2img-1p4B-multinode-clip-encoder-high-res-512.yaml")
+    #config = OmegaConf.load("configs/stable-diffusion/txt2img-upscale-clip-encoder-f16-1024.yaml")
+    config = OmegaConf.load("configs/stable-diffusion/txt2img-v2-clip-encoder-improved_aesthetics-256.yaml")
+    datamod = WebDataModuleFromConfig(**config["data"]["params"])
+    dataloader = datamod.train_dataloader()
+
+    for batch in dataloader:
+        print(batch.keys())
+        print(batch["jpg"].shape)
+        break
+
+
+def example03():
+    # improved aesthetics
+    tars = "pipe:aws s3 cp s3://s-laion/improved-aesthetics-laion-2B-en-subsets/aesthetics_tars/{000000..060207}.tar -"
+    dataset = wds.WebDataset(tars)
+
+    def filter_keys(x):
+        try:
+            return ("jpg" in x) and ("txt" in x)
+        except Exception:
+            return False
+
+    def filter_size(x):
+        try:
+            return x['json']['original_width'] >= 512 and x['json']['original_height'] >= 512
+        except Exception:
+            return False
+
+    def filter_watermark(x):
+        try:
+            return x['json']['pwatermark'] < 0.5
+        except Exception:
+            return False
+
+    dataset = (dataset
+                .select(filter_keys)
+                .decode('pil', handler=wds.warn_and_continue))
+    n_save = 20
+    n_total = 0
+    n_large = 0
+    n_large_nowm = 0
+    for i, example in enumerate(dataset):
+        n_total += 1
+        if filter_size(example):
+            n_large += 1
+            if filter_watermark(example):
+                n_large_nowm += 1
+                if n_large_nowm < n_save+1:
+                    image = example["jpg"]
+                    image.save(os.path.join("tmp", f"{n_large_nowm-1:06}.png"))
+
+        if i%500 == 0:
+            print(i)
+            print(f"Large: {n_large}/{n_total} | {n_large/n_total*100:.2f}%")
+            if n_large > 0:
+                print(f"No Watermark: {n_large_nowm}/{n_large} | {n_large_nowm/n_large*100:.2f}%")
+
+
+
+def example04():
+    # improved aesthetics
+    for i_shard in range(60208)[::-1]:
+        print(i_shard)
+        tars = "pipe:aws s3 cp s3://s-laion/improved-aesthetics-laion-2B-en-subsets/aesthetics_tars/{:06}.tar -".format(i_shard)
+        dataset = wds.WebDataset(tars)
+
+        def filter_keys(x):
+            try:
+                return ("jpg" in x) and ("txt" in x)
+            except Exception:
+                return False
+
+        def filter_size(x):
+            try:
+                return x['json']['original_width'] >= 512 and x['json']['original_height'] >= 512
+            except Exception:
+                return False
+
+        dataset = (dataset
+                    .select(filter_keys)
+                    .decode('pil', handler=wds.warn_and_continue))
+        try:
+            example = next(iter(dataset))
+        except Exception:
+            print(f"Error @ {i_shard}")
+
+
+if __name__ == "__main__":
+    #example01()
+    #example02()
+    example03()
+    #example04()

ldm/data/lsun.py

@@ -0,0 +1,92 @@
+import os
+import numpy as np
+import PIL
+from PIL import Image
+from torch.utils.data import Dataset
+from torchvision import transforms
+
+
+class LSUNBase(Dataset):
+    def __init__(self,
+                 txt_file,
+                 data_root,
+                 size=None,
+                 interpolation="bicubic",
+                 flip_p=0.5
+                 ):
+        self.data_paths = txt_file
+        self.data_root = data_root
+        with open(self.data_paths, "r") as f:
+            self.image_paths = f.read().splitlines()
+        self._length = len(self.image_paths)
+        self.labels = {
+            "relative_file_path_": [l for l in self.image_paths],
+            "file_path_": [os.path.join(self.data_root, l)
+                           for l in self.image_paths],
+        }
+
+        self.size = size
+        self.interpolation = {"linear": PIL.Image.LINEAR,
+                              "bilinear": PIL.Image.BILINEAR,
+                              "bicubic": PIL.Image.BICUBIC,
+                              "lanczos": PIL.Image.LANCZOS,
+                              }[interpolation]
+        self.flip = transforms.RandomHorizontalFlip(p=flip_p)
+
+    def __len__(self):
+        return self._length
+
+    def __getitem__(self, i):
+        example = dict((k, self.labels[k][i]) for k in self.labels)
+        image = Image.open(example["file_path_"])
+        if not image.mode == "RGB":
+            image = image.convert("RGB")
+
+        # default to score-sde preprocessing
+        img = np.array(image).astype(np.uint8)
+        crop = min(img.shape[0], img.shape[1])
+        h, w, = img.shape[0], img.shape[1]
+        img = img[(h - crop) // 2:(h + crop) // 2,
+              (w - crop) // 2:(w + crop) // 2]
+
+        image = Image.fromarray(img)
+        if self.size is not None:
+            image = image.resize((self.size, self.size), resample=self.interpolation)
+
+        image = self.flip(image)
+        image = np.array(image).astype(np.uint8)
+        example["image"] = (image / 127.5 - 1.0).astype(np.float32)
+        return example
+
+
+class LSUNChurchesTrain(LSUNBase):
+    def __init__(self, **kwargs):
+        super().__init__(txt_file="data/lsun/church_outdoor_train.txt", data_root="data/lsun/churches", **kwargs)
+
+
+class LSUNChurchesValidation(LSUNBase):
+    def __init__(self, flip_p=0., **kwargs):
+        super().__init__(txt_file="data/lsun/church_outdoor_val.txt", data_root="data/lsun/churches",
+                         flip_p=flip_p, **kwargs)
+
+
+class LSUNBedroomsTrain(LSUNBase):
+    def __init__(self, **kwargs):
+        super().__init__(txt_file="data/lsun/bedrooms_train.txt", data_root="data/lsun/bedrooms", **kwargs)
+
+
+class LSUNBedroomsValidation(LSUNBase):
+    def __init__(self, flip_p=0.0, **kwargs):
+        super().__init__(txt_file="data/lsun/bedrooms_val.txt", data_root="data/lsun/bedrooms",
+                         flip_p=flip_p, **kwargs)
+
+
+class LSUNCatsTrain(LSUNBase):
+    def __init__(self, **kwargs):
+        super().__init__(txt_file="data/lsun/cat_train.txt", data_root="data/lsun/cats", **kwargs)
+
+
+class LSUNCatsValidation(LSUNBase):
+    def __init__(self, flip_p=0., **kwargs):
+        super().__init__(txt_file="data/lsun/cat_val.txt", data_root="data/lsun/cats",
+                         flip_p=flip_p, **kwargs)

ldm/data/nerf_like.py

@@ -0,0 +1,165 @@
+from torch.utils.data import Dataset
+import os
+import json
+import numpy as np
+import torch
+import imageio
+import math
+import cv2
+from torchvision import transforms
+
+def cartesian_to_spherical(xyz):
+    ptsnew = np.hstack((xyz, np.zeros(xyz.shape)))
+    xy = xyz[:,0]**2 + xyz[:,1]**2
+    z = np.sqrt(xy + xyz[:,2]**2)
+    theta = np.arctan2(np.sqrt(xy), xyz[:,2]) # for elevation angle defined from Z-axis down
+    #ptsnew[:,4] = np.arctan2(xyz[:,2], np.sqrt(xy)) # for elevation angle defined from XY-plane up
+    azimuth = np.arctan2(xyz[:,1], xyz[:,0])
+    return np.array([theta, azimuth, z])
+
+
+def get_T(T_target, T_cond):
+    theta_cond, azimuth_cond, z_cond = cartesian_to_spherical(T_cond[None, :])
+    theta_target, azimuth_target, z_target = cartesian_to_spherical(T_target[None, :])
+    
+    d_theta = theta_target - theta_cond
+    d_azimuth = (azimuth_target - azimuth_cond) % (2 * math.pi)
+    d_z = z_target - z_cond
+    
+    d_T = torch.tensor([d_theta.item(), math.sin(d_azimuth.item()), math.cos(d_azimuth.item()), d_z.item()])
+    return d_T
+
+def get_spherical(T_target, T_cond):
+    theta_cond, azimuth_cond, z_cond = cartesian_to_spherical(T_cond[None, :])
+    theta_target, azimuth_target, z_target = cartesian_to_spherical(T_target[None, :])
+    
+    d_theta = theta_target - theta_cond
+    d_azimuth = (azimuth_target - azimuth_cond) % (2 * math.pi)
+    d_z = z_target - z_cond
+    
+    d_T = torch.tensor([math.degrees(d_theta.item()), math.degrees(d_azimuth.item()), d_z.item()])
+    return d_T
+
+class RTMV(Dataset):
+    def __init__(self, root_dir='datasets/RTMV/google_scanned',\
+                 first_K=64, resolution=256, load_target=False):
+        self.root_dir = root_dir
+        self.scene_list = sorted(next(os.walk(root_dir))[1])
+        self.resolution = resolution
+        self.first_K = first_K
+        self.load_target = load_target
+
+    def __len__(self):
+        return len(self.scene_list)
+
+    def __getitem__(self, idx):
+        scene_dir = os.path.join(self.root_dir, self.scene_list[idx])
+        with open(os.path.join(scene_dir, 'transforms.json'), "r") as f:
+            meta = json.load(f)
+        imgs = []
+        poses = []
+        for i_img in range(self.first_K):
+            meta_img = meta['frames'][i_img]
+
+            if i_img == 0 or self.load_target:
+                img_path = os.path.join(scene_dir, meta_img['file_path'])
+                img = imageio.imread(img_path)
+                img = cv2.resize(img, (self.resolution, self.resolution), interpolation = cv2.INTER_LINEAR)
+                imgs.append(img)
+            
+            c2w = meta_img['transform_matrix']
+            poses.append(c2w)
+            
+        imgs = (np.array(imgs) / 255.).astype(np.float32)  # (RGBA) imgs
+        imgs = torch.tensor(self.blend_rgba(imgs)).permute(0, 3, 1, 2)
+        imgs = imgs * 2 - 1. # convert to stable diffusion range
+        poses = torch.tensor(np.array(poses).astype(np.float32))
+        return imgs, poses
+                
+    def blend_rgba(self, img):
+        img = img[..., :3] * img[..., -1:] + (1. - img[..., -1:])  # blend A to RGB
+        return img
+            
+
+class GSO(Dataset):
+    def __init__(self, root_dir='datasets/GoogleScannedObjects',\
+                 split='val', first_K=5, resolution=256, load_target=False, name='render_mvs'):
+        self.root_dir = root_dir
+        with open(os.path.join(root_dir, '%s.json' % split), "r") as f:
+            self.scene_list = json.load(f)
+        self.resolution = resolution
+        self.first_K = first_K
+        self.load_target = load_target
+        self.name = name
+
+    def __len__(self):
+        return len(self.scene_list)
+
+    def __getitem__(self, idx):
+        scene_dir = os.path.join(self.root_dir, self.scene_list[idx])
+        with open(os.path.join(scene_dir, 'transforms_%s.json' % self.name), "r") as f:
+            meta = json.load(f)
+        imgs = []
+        poses = []
+        for i_img in range(self.first_K):
+            meta_img = meta['frames'][i_img]
+
+            if i_img == 0 or self.load_target:
+                img_path = os.path.join(scene_dir, meta_img['file_path'])
+                img = imageio.imread(img_path)
+                img = cv2.resize(img, (self.resolution, self.resolution), interpolation = cv2.INTER_LINEAR)
+                imgs.append(img)
+            
+            c2w = meta_img['transform_matrix']
+            poses.append(c2w)
+            
+        imgs = (np.array(imgs) / 255.).astype(np.float32)  # (RGBA) imgs
+        mask = imgs[:, :, :, -1]
+        imgs = torch.tensor(self.blend_rgba(imgs)).permute(0, 3, 1, 2)
+        imgs = imgs * 2 - 1. # convert to stable diffusion range
+        poses = torch.tensor(np.array(poses).astype(np.float32))
+        return imgs, poses
+                
+    def blend_rgba(self, img):
+        img = img[..., :3] * img[..., -1:] + (1. - img[..., -1:])  # blend A to RGB
+        return img
+             
+class WILD(Dataset):
+    def __init__(self, root_dir='data/nerf_wild',\
+                 first_K=33, resolution=256, load_target=False):
+        self.root_dir = root_dir
+        self.scene_list = sorted(next(os.walk(root_dir))[1])
+        self.resolution = resolution
+        self.first_K = first_K
+        self.load_target = load_target
+
+    def __len__(self):
+        return len(self.scene_list)
+
+    def __getitem__(self, idx):
+        scene_dir = os.path.join(self.root_dir, self.scene_list[idx])
+        with open(os.path.join(scene_dir, 'transforms_train.json'), "r") as f:
+            meta = json.load(f)
+        imgs = []
+        poses = []
+        for i_img in range(self.first_K):
+            meta_img = meta['frames'][i_img]
+
+            if i_img == 0 or self.load_target:
+                img_path = os.path.join(scene_dir, meta_img['file_path'])
+                img = imageio.imread(img_path + '.png')
+                img = cv2.resize(img, (self.resolution, self.resolution), interpolation = cv2.INTER_LINEAR)
+                imgs.append(img)
+            
+            c2w = meta_img['transform_matrix']
+            poses.append(c2w)
+            
+        imgs = (np.array(imgs) / 255.).astype(np.float32)  # (RGBA) imgs
+        imgs = torch.tensor(self.blend_rgba(imgs)).permute(0, 3, 1, 2)
+        imgs = imgs * 2 - 1. # convert to stable diffusion range
+        poses = torch.tensor(np.array(poses).astype(np.float32))
+        return imgs, poses
+                
+    def blend_rgba(self, img):
+        img = img[..., :3] * img[..., -1:] + (1. - img[..., -1:])  # blend A to RGB
+        return img

ldm/data/simple.py

@@ -0,0 +1,526 @@
+from typing import Dict
+import webdataset as wds
+import numpy as np
+from omegaconf import DictConfig, ListConfig
+import torch
+from torch.utils.data import Dataset
+from pathlib import Path
+import json
+from PIL import Image
+from torchvision import transforms
+import torchvision
+from einops import rearrange
+from ldm.util import instantiate_from_config
+from datasets import load_dataset
+import pytorch_lightning as pl
+import copy
+import csv
+import cv2
+import random
+import matplotlib.pyplot as plt
+from torch.utils.data import DataLoader
+import json
+import os
+import webdataset as wds
+import math
+from torch.utils.data.distributed import DistributedSampler
+
+# Some hacky things to make experimentation easier
+def make_transform_multi_folder_data(paths, caption_files=None, **kwargs):
+    ds = make_multi_folder_data(paths, caption_files, **kwargs)
+    return TransformDataset(ds)
+
+def make_nfp_data(base_path):
+    dirs = list(Path(base_path).glob("*/"))
+    print(f"Found {len(dirs)} folders")
+    print(dirs)
+    tforms = [transforms.Resize(512), transforms.CenterCrop(512)]
+    datasets = [NfpDataset(x, image_transforms=copy.copy(tforms), default_caption="A view from a train window") for x in dirs]
+    return torch.utils.data.ConcatDataset(datasets)
+
+
+class VideoDataset(Dataset):
+    def __init__(self, root_dir, image_transforms, caption_file, offset=8, n=2):
+        self.root_dir = Path(root_dir)
+        self.caption_file = caption_file
+        self.n = n
+        ext = "mp4"
+        self.paths = sorted(list(self.root_dir.rglob(f"*.{ext}")))
+        self.offset = offset
+
+        if isinstance(image_transforms, ListConfig):
+            image_transforms = [instantiate_from_config(tt) for tt in image_transforms]
+        image_transforms.extend([transforms.ToTensor(),
+                                 transforms.Lambda(lambda x: rearrange(x * 2. - 1., 'c h w -> h w c'))])
+        image_transforms = transforms.Compose(image_transforms)
+        self.tform = image_transforms
+        with open(self.caption_file) as f:
+            reader = csv.reader(f)
+            rows = [row for row in reader]
+        self.captions = dict(rows)
+
+    def __len__(self):
+        return len(self.paths)
+
+    def __getitem__(self, index):
+        for i in range(10):
+            try:
+                return self._load_sample(index)
+            except Exception:
+                # Not really good enough but...
+                print("uh oh")
+
+    def _load_sample(self, index):
+        n = self.n
+        filename = self.paths[index]
+        min_frame = 2*self.offset + 2
+        vid = cv2.VideoCapture(str(filename))
+        max_frames = int(vid.get(cv2.CAP_PROP_FRAME_COUNT))
+        curr_frame_n = random.randint(min_frame, max_frames)
+        vid.set(cv2.CAP_PROP_POS_FRAMES,curr_frame_n)
+        _, curr_frame = vid.read()
+
+        prev_frames = []
+        for i in range(n):
+            prev_frame_n = curr_frame_n - (i+1)*self.offset
+            vid.set(cv2.CAP_PROP_POS_FRAMES,prev_frame_n)
+            _, prev_frame = vid.read()
+            prev_frame = self.tform(Image.fromarray(prev_frame[...,::-1]))
+            prev_frames.append(prev_frame)
+
+        vid.release()
+        caption = self.captions[filename.name]
+        data = {
+            "image": self.tform(Image.fromarray(curr_frame[...,::-1])),
+            "prev": torch.cat(prev_frames, dim=-1),
+            "txt": caption
+        }
+        return data
+
+# end hacky things
+
+
+def make_tranforms(image_transforms):
+    # if isinstance(image_transforms, ListConfig):
+    #     image_transforms = [instantiate_from_config(tt) for tt in image_transforms]
+    image_transforms = []
+    image_transforms.extend([transforms.ToTensor(),
+                                transforms.Lambda(lambda x: rearrange(x * 2. - 1., 'c h w -> h w c'))])
+    image_transforms = transforms.Compose(image_transforms)
+    return image_transforms
+
+
+def make_multi_folder_data(paths, caption_files=None, **kwargs):
+    """Make a concat dataset from multiple folders
+    Don't suport captions yet
+
+    If paths is a list, that's ok, if it's a Dict interpret it as:
+    k=folder v=n_times to repeat that
+    """
+    list_of_paths = []
+    if isinstance(paths, (Dict, DictConfig)):
+        assert caption_files is None, \
+            "Caption files not yet supported for repeats"
+        for folder_path, repeats in paths.items():
+            list_of_paths.extend([folder_path]*repeats)
+        paths = list_of_paths
+
+    if caption_files is not None:
+        datasets = [FolderData(p, caption_file=c, **kwargs) for (p, c) in zip(paths, caption_files)]
+    else:
+        datasets = [FolderData(p, **kwargs) for p in paths]
+    return torch.utils.data.ConcatDataset(datasets)
+
+
+
+class NfpDataset(Dataset):
+    def __init__(self,
+        root_dir,
+        image_transforms=[],
+        ext="jpg",
+        default_caption="",
+        ) -> None:
+        """assume sequential frames and a deterministic transform"""
+
+        self.root_dir = Path(root_dir)
+        self.default_caption = default_caption
+
+        self.paths = sorted(list(self.root_dir.rglob(f"*.{ext}")))
+        self.tform = make_tranforms(image_transforms)
+
+    def __len__(self):
+        return len(self.paths) - 1
+
+
+    def __getitem__(self, index):
+        prev = self.paths[index]
+        curr = self.paths[index+1]
+        data = {}
+        data["image"] = self._load_im(curr)
+        data["prev"] = self._load_im(prev)
+        data["txt"] = self.default_caption
+        return data
+
+    def _load_im(self, filename):
+        im = Image.open(filename).convert("RGB")
+        return self.tform(im)
+
+class ObjaverseDataModuleFromConfig(pl.LightningDataModule):
+    def __init__(self, root_dir, batch_size, total_view, train=None, validation=None,
+                 test=None, num_workers=4, **kwargs):
+        super().__init__(self)
+        self.root_dir = root_dir
+        self.batch_size = batch_size
+        self.num_workers = num_workers
+        self.total_view = total_view
+
+        if train is not None:
+            dataset_config = train
+        if validation is not None:
+            dataset_config = validation
+
+        if 'image_transforms' in dataset_config:
+            image_transforms = [torchvision.transforms.Resize(dataset_config.image_transforms.size)]
+        else:
+            image_transforms = []
+        image_transforms.extend([transforms.ToTensor(),
+                                transforms.Lambda(lambda x: rearrange(x * 2. - 1., 'c h w -> h w c'))])
+        self.image_transforms = torchvision.transforms.Compose(image_transforms)
+
+
+    def train_dataloader(self):
+        dataset = ObjaverseData(root_dir=self.root_dir, total_view=self.total_view, validation=False, \
+                                image_transforms=self.image_transforms)
+        sampler = DistributedSampler(dataset)
+        return wds.WebLoader(dataset, batch_size=self.batch_size, num_workers=self.num_workers, shuffle=False, sampler=sampler)
+
+    def val_dataloader(self):
+        dataset = ObjaverseData(root_dir=self.root_dir, total_view=self.total_view, validation=True, \
+                                image_transforms=self.image_transforms)
+        sampler = DistributedSampler(dataset)
+        return wds.WebLoader(dataset, batch_size=self.batch_size, num_workers=self.num_workers, shuffle=False)
+    
+    def test_dataloader(self):
+        return wds.WebLoader(ObjaverseData(root_dir=self.root_dir, total_view=self.total_view, validation=self.validation),\
+                          batch_size=self.batch_size, num_workers=self.num_workers, shuffle=False)
+
+
+class ObjaverseData(Dataset):
+    def __init__(self,
+        root_dir='.objaverse/hf-objaverse-v1/views',
+        image_transforms=[],
+        ext="png",
+        default_trans=torch.zeros(3),
+        postprocess=None,
+        return_paths=False,
+        total_view=4,
+        validation=False
+        ) -> None:
+        """Create a dataset from a folder of images.
+        If you pass in a root directory it will be searched for images
+        ending in ext (ext can be a list)
+        """
+        self.root_dir = Path(root_dir)
+        self.default_trans = default_trans
+        self.return_paths = return_paths
+        if isinstance(postprocess, DictConfig):
+            postprocess = instantiate_from_config(postprocess)
+        self.postprocess = postprocess
+        self.total_view = total_view
+
+        if not isinstance(ext, (tuple, list, ListConfig)):
+            ext = [ext]
+
+        with open(os.path.join(root_dir, 'valid_paths.json')) as f:
+            self.paths = json.load(f)
+            
+        total_objects = len(self.paths)
+        if validation:
+            self.paths = self.paths[math.floor(total_objects / 100. * 99.):] # used last 1% as validation
+        else:
+            self.paths = self.paths[:math.floor(total_objects / 100. * 99.)] # used first 99% as training
+        print('============= length of dataset %d =============' % len(self.paths))
+        self.tform = image_transforms
+
+    def __len__(self):
+        return len(self.paths)
+        
+    def cartesian_to_spherical(self, xyz):
+        ptsnew = np.hstack((xyz, np.zeros(xyz.shape)))
+        xy = xyz[:,0]**2 + xyz[:,1]**2
+        z = np.sqrt(xy + xyz[:,2]**2)
+        theta = np.arctan2(np.sqrt(xy), xyz[:,2]) # for elevation angle defined from Z-axis down
+        #ptsnew[:,4] = np.arctan2(xyz[:,2], np.sqrt(xy)) # for elevation angle defined from XY-plane up
+        azimuth = np.arctan2(xyz[:,1], xyz[:,0])
+        return np.array([theta, azimuth, z])
+
+    def get_T(self, target_RT, cond_RT):
+        R, T = target_RT[:3, :3], target_RT[:, -1]
+        T_target = -R.T @ T
+
+        R, T = cond_RT[:3, :3], cond_RT[:, -1]
+        T_cond = -R.T @ T
+
+        theta_cond, azimuth_cond, z_cond = self.cartesian_to_spherical(T_cond[None, :])
+        theta_target, azimuth_target, z_target = self.cartesian_to_spherical(T_target[None, :])
+        
+        d_theta = theta_target - theta_cond
+        d_azimuth = (azimuth_target - azimuth_cond) % (2 * math.pi)
+        d_z = z_target - z_cond
+        
+        d_T = torch.tensor([d_theta.item(), math.sin(d_azimuth.item()), math.cos(d_azimuth.item()), d_z.item()])
+        return d_T
+
+    def load_im(self, path, color):
+        '''
+        replace background pixel with random color in rendering
+        '''
+        try:
+            img = plt.imread(path)
+        except:
+            print(path)
+            sys.exit()
+        img[img[:, :, -1] == 0.] = color
+        img = Image.fromarray(np.uint8(img[:, :, :3] * 255.))
+        return img
+
+    def __getitem__(self, index):
+
+        data = {}
+        if self.paths[index][-2:] == '_1': # dirty fix for rendering dataset twice
+            total_view = 8
+        else:
+            total_view = 4
+        index_target, index_cond = random.sample(range(total_view), 2) # without replacement
+        filename = os.path.join(self.root_dir, self.paths[index])
+
+        # print(self.paths[index])
+
+        if self.return_paths:
+            data["path"] = str(filename)
+        
+        color = [1., 1., 1., 1.]
+
+        try:
+            target_im = self.process_im(self.load_im(os.path.join(filename, '%03d.png' % index_target), color))
+            cond_im = self.process_im(self.load_im(os.path.join(filename, '%03d.png' % index_cond), color))
+            target_RT = np.load(os.path.join(filename, '%03d.npy' % index_target))
+            cond_RT = np.load(os.path.join(filename, '%03d.npy' % index_cond))
+        except:
+            # very hacky solution, sorry about this
+            filename = os.path.join(self.root_dir, '692db5f2d3a04bb286cb977a7dba903e_1') # this one we know is valid
+            target_im = self.process_im(self.load_im(os.path.join(filename, '%03d.png' % index_target), color))
+            cond_im = self.process_im(self.load_im(os.path.join(filename, '%03d.png' % index_cond), color))
+            target_RT = np.load(os.path.join(filename, '%03d.npy' % index_target))
+            cond_RT = np.load(os.path.join(filename, '%03d.npy' % index_cond))
+            target_im = torch.zeros_like(target_im)
+            cond_im = torch.zeros_like(cond_im)
+
+        data["image_target"] = target_im
+        data["image_cond"] = cond_im
+        data["T"] = self.get_T(target_RT, cond_RT)
+
+        if self.postprocess is not None:
+            data = self.postprocess(data)
+
+        return data
+
+    def process_im(self, im):
+        im = im.convert("RGB")
+        return self.tform(im)
+
+class FolderData(Dataset):
+    def __init__(self,
+        root_dir,
+        caption_file=None,
+        image_transforms=[],
+        ext="jpg",
+        default_caption="",
+        postprocess=None,
+        return_paths=False,
+        ) -> None:
+        """Create a dataset from a folder of images.
+        If you pass in a root directory it will be searched for images
+        ending in ext (ext can be a list)
+        """
+        self.root_dir = Path(root_dir)
+        self.default_caption = default_caption
+        self.return_paths = return_paths
+        if isinstance(postprocess, DictConfig):
+            postprocess = instantiate_from_config(postprocess)
+        self.postprocess = postprocess
+        if caption_file is not None:
+            with open(caption_file, "rt") as f:
+                ext = Path(caption_file).suffix.lower()
+                if ext == ".json":
+                    captions = json.load(f)
+                elif ext == ".jsonl":
+                    lines = f.readlines()
+                    lines = [json.loads(x) for x in lines]
+                    captions = {x["file_name"]: x["text"].strip("\n") for x in lines}
+                else:
+                    raise ValueError(f"Unrecognised format: {ext}")
+            self.captions = captions
+        else:
+            self.captions = None
+
+        if not isinstance(ext, (tuple, list, ListConfig)):
+            ext = [ext]
+
+        # Only used if there is no caption file
+        self.paths = []
+        for e in ext:
+            self.paths.extend(sorted(list(self.root_dir.rglob(f"*.{e}"))))
+        self.tform = make_tranforms(image_transforms)
+
+    def __len__(self):
+        if self.captions is not None:
+            return len(self.captions.keys())
+        else:
+            return len(self.paths)
+
+    def __getitem__(self, index):
+        data = {}
+        if self.captions is not None:
+            chosen = list(self.captions.keys())[index]
+            caption = self.captions.get(chosen, None)
+            if caption is None:
+                caption = self.default_caption
+            filename = self.root_dir/chosen
+        else:
+            filename = self.paths[index]
+
+        if self.return_paths:
+            data["path"] = str(filename)
+
+        im = Image.open(filename).convert("RGB")
+        im = self.process_im(im)
+        data["image"] = im
+
+        if self.captions is not None:
+            data["txt"] = caption
+        else:
+            data["txt"] = self.default_caption
+
+        if self.postprocess is not None:
+            data = self.postprocess(data)
+
+        return data
+
+    def process_im(self, im):
+        im = im.convert("RGB")
+        return self.tform(im)
+import random
+
+class TransformDataset():
+    def __init__(self, ds, extra_label="sksbspic"):
+        self.ds = ds
+        self.extra_label = extra_label
+        self.transforms = {
+            "align": transforms.Resize(768),
+            "centerzoom": transforms.CenterCrop(768),
+            "randzoom": transforms.RandomCrop(768),
+        }
+
+
+    def __getitem__(self, index):
+        data = self.ds[index]
+
+        im = data['image']
+        im = im.permute(2,0,1)
+        # In case data is smaller than expected
+        im = transforms.Resize(1024)(im)
+
+        tform_name = random.choice(list(self.transforms.keys()))
+        im = self.transforms[tform_name](im)
+
+        im = im.permute(1,2,0)
+
+        data['image'] = im
+        data['txt'] = data['txt'] + f" {self.extra_label} {tform_name}"
+
+        return data
+
+    def __len__(self):
+        return len(self.ds)
+
+def hf_dataset(
+    name,
+    image_transforms=[],
+    image_column="image",
+    text_column="text",
+    split='train',
+    image_key='image',
+    caption_key='txt',
+    ):
+    """Make huggingface dataset with appropriate list of transforms applied
+    """
+    ds = load_dataset(name, split=split)
+    tform = make_tranforms(image_transforms)
+
+    assert image_column in ds.column_names, f"Didn't find column {image_column} in {ds.column_names}"
+    assert text_column in ds.column_names, f"Didn't find column {text_column} in {ds.column_names}"
+
+    def pre_process(examples):
+        processed = {}
+        processed[image_key] = [tform(im) for im in examples[image_column]]
+        processed[caption_key] = examples[text_column]
+        return processed
+
+    ds.set_transform(pre_process)
+    return ds
+
+class TextOnly(Dataset):
+    def __init__(self, captions, output_size, image_key="image", caption_key="txt", n_gpus=1):
+        """Returns only captions with dummy images"""
+        self.output_size = output_size
+        self.image_key = image_key
+        self.caption_key = caption_key
+        if isinstance(captions, Path):
+            self.captions = self._load_caption_file(captions)
+        else:
+            self.captions = captions
+
+        if n_gpus > 1:
+            # hack to make sure that all the captions appear on each gpu
+            repeated = [n_gpus*[x] for x in self.captions]
+            self.captions = []
+            [self.captions.extend(x) for x in repeated]
+
+    def __len__(self):
+        return len(self.captions)
+
+    def __getitem__(self, index):
+        dummy_im = torch.zeros(3, self.output_size, self.output_size)
+        dummy_im = rearrange(dummy_im * 2. - 1., 'c h w -> h w c')
+        return {self.image_key: dummy_im, self.caption_key: self.captions[index]}
+
+    def _load_caption_file(self, filename):
+        with open(filename, 'rt') as f:
+            captions = f.readlines()
+        return [x.strip('\n') for x in captions]
+
+
+
+import random
+import json
+class IdRetreivalDataset(FolderData):
+    def __init__(self, ret_file, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        with open(ret_file, "rt") as f:
+            self.ret = json.load(f)
+
+    def __getitem__(self, index):
+        data = super().__getitem__(index)
+        key = self.paths[index].name
+        matches = self.ret[key]
+        if len(matches) > 0:
+            retreived = random.choice(matches)
+        else:
+            retreived = key
+        filename = self.root_dir/retreived
+        im = Image.open(filename).convert("RGB")
+        im = self.process_im(im)
+        # data["match"] = im
+        data["match"] = torch.cat((data["image"], im), dim=-1)
+        return data

ldm/data/sync_dreamer.py

@@ -0,0 +1,132 @@
+import pytorch_lightning as pl
+import numpy as np
+import torch
+import PIL
+import os
+from skimage.io import imread
+import webdataset as wds
+import PIL.Image as Image
+from torch.utils.data import Dataset
+from torch.utils.data.distributed import DistributedSampler
+from pathlib import Path
+
+from ldm.base_utils import read_pickle, pose_inverse
+import torchvision.transforms as transforms
+import torchvision
+from einops import rearrange
+
+from ldm.util import prepare_inputs
+
+
+class SyncDreamerTrainData(Dataset):
+    def __init__(self, target_dir, input_dir, uid_set_pkl, image_size=256):
+        self.default_image_size = 256
+        self.image_size = image_size
+        self.target_dir = Path(target_dir)
+        self.input_dir = Path(input_dir)
+
+        self.uids = read_pickle(uid_set_pkl)
+        print('============= length of dataset %d =============' % len(self.uids))
+
+        image_transforms = []
+        image_transforms.extend([transforms.ToTensor(), transforms.Lambda(lambda x: rearrange(x * 2. - 1., 'c h w -> h w c'))])
+        self.image_transforms = torchvision.transforms.Compose(image_transforms)
+        self.num_images = 16
+
+    def __len__(self):
+        return len(self.uids)
+
+    def load_im(self, path):
+        img = imread(path)
+        img = img.astype(np.float32) / 255.0
+        mask = img[:,:,3:]
+        img[:,:,:3] = img[:,:,:3] * mask + 1 - mask # white background
+        img = Image.fromarray(np.uint8(img[:, :, :3] * 255.))
+        return img, mask
+
+    def process_im(self, im):
+        im = im.convert("RGB")
+        im = im.resize((self.image_size, self.image_size), resample=PIL.Image.BICUBIC)
+        return self.image_transforms(im)
+
+    def load_index(self, filename, index):
+        img, _ = self.load_im(os.path.join(filename, '%03d.png' % index))
+        img = self.process_im(img)
+        return img
+
+    def get_data_for_index(self, index):
+        target_dir = os.path.join(self.target_dir, self.uids[index])
+        input_dir = os.path.join(self.input_dir, self.uids[index])
+
+        views = np.arange(0, self.num_images)
+        start_view_index = np.random.randint(0, self.num_images)
+        views = (views + start_view_index) % self.num_images
+
+        target_images = []
+        for si, target_index in enumerate(views):
+            img = self.load_index(target_dir, target_index)
+            target_images.append(img)
+        target_images = torch.stack(target_images, 0)
+        input_img = self.load_index(input_dir, start_view_index)
+
+        K, azimuths, elevations, distances, cam_poses = read_pickle(os.path.join(input_dir, f'meta.pkl'))
+        input_elevation = torch.from_numpy(elevations[start_view_index:start_view_index+1].astype(np.float32))
+        return {"target_image": target_images, "input_image": input_img, "input_elevation": input_elevation}
+
+    def __getitem__(self, index):
+        data = self.get_data_for_index(index)
+        return data
+
+class SyncDreamerEvalData(Dataset):
+    def __init__(self, image_dir):
+        self.image_size = 256
+        self.image_dir = Path(image_dir)
+        self.crop_size = 20
+
+        self.fns = []
+        for fn in Path(image_dir).iterdir():
+            if fn.suffix=='.png':
+                self.fns.append(fn)
+        print('============= length of dataset %d =============' % len(self.fns))
+
+    def __len__(self):
+        return len(self.fns)
+
+    def get_data_for_index(self, index):
+        input_img_fn = self.fns[index]
+        elevation = int(Path(input_img_fn).stem.split('-')[-1])
+        return prepare_inputs(input_img_fn, elevation, 200)
+
+    def __getitem__(self, index):
+        return self.get_data_for_index(index)
+
+class SyncDreamerDataset(pl.LightningDataModule):
+    def __init__(self, target_dir, input_dir, validation_dir, batch_size, uid_set_pkl, image_size=256, num_workers=4, seed=0, **kwargs):
+        super().__init__()
+        self.target_dir = target_dir
+        self.input_dir = input_dir
+        self.validation_dir = validation_dir
+        self.batch_size = batch_size
+        self.num_workers = num_workers
+        self.uid_set_pkl = uid_set_pkl
+        self.seed = seed
+        self.additional_args = kwargs
+        self.image_size = image_size
+
+    def setup(self, stage):
+        if stage in ['fit']:
+            self.train_dataset = SyncDreamerTrainData(self.target_dir, self.input_dir, uid_set_pkl=self.uid_set_pkl, image_size=256)
+            self.val_dataset = SyncDreamerEvalData(image_dir=self.validation_dir)
+        else:
+            raise NotImplementedError
+
+    def train_dataloader(self):
+        sampler = DistributedSampler(self.train_dataset, seed=self.seed)
+        return wds.WebLoader(self.train_dataset, batch_size=self.batch_size, num_workers=self.num_workers, shuffle=False, sampler=sampler)
+
+    def val_dataloader(self):
+        loader = wds.WebLoader(self.val_dataset, batch_size=self.batch_size, num_workers=self.num_workers, shuffle=False)
+        return loader
+
+    def test_dataloader(self):
+        return wds.WebLoader(self.val_dataset, batch_size=self.batch_size, num_workers=self.num_workers, shuffle=False)

ldm/lr_scheduler.py

@@ -0,0 +1,98 @@
+import numpy as np
+
+
+class LambdaWarmUpCosineScheduler:
+    """
+    note: use with a base_lr of 1.0
+    """
+    def __init__(self, warm_up_steps, lr_min, lr_max, lr_start, max_decay_steps, verbosity_interval=0):
+        self.lr_warm_up_steps = warm_up_steps
+        self.lr_start = lr_start
+        self.lr_min = lr_min
+        self.lr_max = lr_max
+        self.lr_max_decay_steps = max_decay_steps
+        self.last_lr = 0.
+        self.verbosity_interval = verbosity_interval
+
+    def schedule(self, n, **kwargs):
+        if self.verbosity_interval > 0:
+            if n % self.verbosity_interval == 0: print(f"current step: {n}, recent lr-multiplier: {self.last_lr}")
+        if n < self.lr_warm_up_steps:
+            lr = (self.lr_max - self.lr_start) / self.lr_warm_up_steps * n + self.lr_start
+            self.last_lr = lr
+            return lr
+        else:
+            t = (n - self.lr_warm_up_steps) / (self.lr_max_decay_steps - self.lr_warm_up_steps)
+            t = min(t, 1.0)
+            lr = self.lr_min + 0.5 * (self.lr_max - self.lr_min) * (
+                    1 + np.cos(t * np.pi))
+            self.last_lr = lr
+            return lr
+
+    def __call__(self, n, **kwargs):
+        return self.schedule(n,**kwargs)
+
+
+class LambdaWarmUpCosineScheduler2:
+    """
+    supports repeated iterations, configurable via lists
+    note: use with a base_lr of 1.0.
+    """
+    def __init__(self, warm_up_steps, f_min, f_max, f_start, cycle_lengths, verbosity_interval=0):
+        assert len(warm_up_steps) == len(f_min) == len(f_max) == len(f_start) == len(cycle_lengths)
+        self.lr_warm_up_steps = warm_up_steps
+        self.f_start = f_start
+        self.f_min = f_min
+        self.f_max = f_max
+        self.cycle_lengths = cycle_lengths
+        self.cum_cycles = np.cumsum([0] + list(self.cycle_lengths))
+        self.last_f = 0.
+        self.verbosity_interval = verbosity_interval
+
+    def find_in_interval(self, n):
+        interval = 0
+        for cl in self.cum_cycles[1:]:
+            if n <= cl:
+                return interval
+            interval += 1
+
+    def schedule(self, n, **kwargs):
+        cycle = self.find_in_interval(n)
+        n = n - self.cum_cycles[cycle]
+        if self.verbosity_interval > 0:
+            if n % self.verbosity_interval == 0: print(f"current step: {n}, recent lr-multiplier: {self.last_f}, "
+                                                       f"current cycle {cycle}")
+        if n < self.lr_warm_up_steps[cycle]:
+            f = (self.f_max[cycle] - self.f_start[cycle]) / self.lr_warm_up_steps[cycle] * n + self.f_start[cycle]
+            self.last_f = f
+            return f
+        else:
+            t = (n - self.lr_warm_up_steps[cycle]) / (self.cycle_lengths[cycle] - self.lr_warm_up_steps[cycle])
+            t = min(t, 1.0)
+            f = self.f_min[cycle] + 0.5 * (self.f_max[cycle] - self.f_min[cycle]) * (
+                    1 + np.cos(t * np.pi))
+            self.last_f = f
+            return f
+
+    def __call__(self, n, **kwargs):
+        return self.schedule(n, **kwargs)
+
+
+class LambdaLinearScheduler(LambdaWarmUpCosineScheduler2):
+
+    def schedule(self, n, **kwargs):
+        cycle = self.find_in_interval(n)
+        n = n - self.cum_cycles[cycle]
+        if self.verbosity_interval > 0:
+            if n % self.verbosity_interval == 0: print(f"current step: {n}, recent lr-multiplier: {self.last_f}, "
+                                                       f"current cycle {cycle}")
+
+        if n < self.lr_warm_up_steps[cycle]:
+            f = (self.f_max[cycle] - self.f_start[cycle]) / self.lr_warm_up_steps[cycle] * n + self.f_start[cycle]
+            self.last_f = f
+            return f
+        else:
+            f = self.f_min[cycle] + (self.f_max[cycle] - self.f_min[cycle]) * (self.cycle_lengths[cycle] - n) / (self.cycle_lengths[cycle])
+            self.last_f = f
+            return f
+

ldm/models/autoencoder.py

@@ -0,0 +1,443 @@
+import torch
+import pytorch_lightning as pl
+import torch.nn.functional as F
+from contextlib import contextmanager
+
+from taming.modules.vqvae.quantize import VectorQuantizer2 as VectorQuantizer
+
+from ldm.modules.diffusionmodules.model import Encoder, Decoder
+from ldm.modules.distributions.distributions import DiagonalGaussianDistribution
+
+from ldm.util import instantiate_from_config
+
+
+class VQModel(pl.LightningModule):
+    def __init__(self,
+                 ddconfig,
+                 lossconfig,
+                 n_embed,
+                 embed_dim,
+                 ckpt_path=None,
+                 ignore_keys=[],
+                 image_key="image",
+                 colorize_nlabels=None,
+                 monitor=None,
+                 batch_resize_range=None,
+                 scheduler_config=None,
+                 lr_g_factor=1.0,
+                 remap=None,
+                 sane_index_shape=False, # tell vector quantizer to return indices as bhw
+                 use_ema=False
+                 ):
+        super().__init__()
+        self.embed_dim = embed_dim
+        self.n_embed = n_embed
+        self.image_key = image_key
+        self.encoder = Encoder(**ddconfig)
+        self.decoder = Decoder(**ddconfig)
+        self.loss = instantiate_from_config(lossconfig)
+        self.quantize = VectorQuantizer(n_embed, embed_dim, beta=0.25,
+                                        remap=remap,
+                                        sane_index_shape=sane_index_shape)
+        self.quant_conv = torch.nn.Conv2d(ddconfig["z_channels"], embed_dim, 1)
+        self.post_quant_conv = torch.nn.Conv2d(embed_dim, ddconfig["z_channels"], 1)
+        if colorize_nlabels is not None:
+            assert type(colorize_nlabels)==int
+            self.register_buffer("colorize", torch.randn(3, colorize_nlabels, 1, 1))
+        if monitor is not None:
+            self.monitor = monitor
+        self.batch_resize_range = batch_resize_range
+        if self.batch_resize_range is not None:
+            print(f"{self.__class__.__name__}: Using per-batch resizing in range {batch_resize_range}.")
+
+        self.use_ema = use_ema
+        if self.use_ema:
+            self.model_ema = LitEma(self)
+            print(f"Keeping EMAs of {len(list(self.model_ema.buffers()))}.")
+
+        if ckpt_path is not None:
+            self.init_from_ckpt(ckpt_path, ignore_keys=ignore_keys)
+        self.scheduler_config = scheduler_config
+        self.lr_g_factor = lr_g_factor
+
+    @contextmanager
+    def ema_scope(self, context=None):
+        if self.use_ema:
+            self.model_ema.store(self.parameters())
+            self.model_ema.copy_to(self)
+            if context is not None:
+                print(f"{context}: Switched to EMA weights")
+        try:
+            yield None
+        finally:
+            if self.use_ema:
+                self.model_ema.restore(self.parameters())
+                if context is not None:
+                    print(f"{context}: Restored training weights")
+
+    def init_from_ckpt(self, path, ignore_keys=list()):
+        sd = torch.load(path, map_location="cpu")["state_dict"]
+        keys = list(sd.keys())
+        for k in keys:
+            for ik in ignore_keys:
+                if k.startswith(ik):
+                    print("Deleting key {} from state_dict.".format(k))
+                    del sd[k]
+        missing, unexpected = self.load_state_dict(sd, strict=False)
+        print(f"Restored from {path} with {len(missing)} missing and {len(unexpected)} unexpected keys")
+        if len(missing) > 0:
+            print(f"Missing Keys: {missing}")
+            print(f"Unexpected Keys: {unexpected}")
+
+    def on_train_batch_end(self, *args, **kwargs):
+        if self.use_ema:
+            self.model_ema(self)
+
+    def encode(self, x):
+        h = self.encoder(x)
+        h = self.quant_conv(h)
+        quant, emb_loss, info = self.quantize(h)
+        return quant, emb_loss, info
+
+    def encode_to_prequant(self, x):
+        h = self.encoder(x)
+        h = self.quant_conv(h)
+        return h
+
+    def decode(self, quant):
+        quant = self.post_quant_conv(quant)
+        dec = self.decoder(quant)
+        return dec
+
+    def decode_code(self, code_b):
+        quant_b = self.quantize.embed_code(code_b)
+        dec = self.decode(quant_b)
+        return dec
+
+    def forward(self, input, return_pred_indices=False):
+        quant, diff, (_,_,ind) = self.encode(input)
+        dec = self.decode(quant)
+        if return_pred_indices:
+            return dec, diff, ind
+        return dec, diff
+
+    def get_input(self, batch, k):
+        x = batch[k]
+        if len(x.shape) == 3:
+            x = x[..., None]
+        x = x.permute(0, 3, 1, 2).to(memory_format=torch.contiguous_format).float()
+        if self.batch_resize_range is not None:
+            lower_size = self.batch_resize_range[0]
+            upper_size = self.batch_resize_range[1]
+            if self.global_step <= 4:
+                # do the first few batches with max size to avoid later oom
+                new_resize = upper_size
+            else:
+                new_resize = np.random.choice(np.arange(lower_size, upper_size+16, 16))
+            if new_resize != x.shape[2]:
+                x = F.interpolate(x, size=new_resize, mode="bicubic")
+            x = x.detach()
+        return x
+
+    def training_step(self, batch, batch_idx, optimizer_idx):
+        # https://github.com/pytorch/pytorch/issues/37142
+        # try not to fool the heuristics
+        x = self.get_input(batch, self.image_key)
+        xrec, qloss, ind = self(x, return_pred_indices=True)
+
+        if optimizer_idx == 0:
+            # autoencode
+            aeloss, log_dict_ae = self.loss(qloss, x, xrec, optimizer_idx, self.global_step,
+                                            last_layer=self.get_last_layer(), split="train",
+                                            predicted_indices=ind)
+
+            self.log_dict(log_dict_ae, prog_bar=False, logger=True, on_step=True, on_epoch=True)
+            return aeloss
+
+        if optimizer_idx == 1:
+            # discriminator
+            discloss, log_dict_disc = self.loss(qloss, x, xrec, optimizer_idx, self.global_step,
+                                            last_layer=self.get_last_layer(), split="train")
+            self.log_dict(log_dict_disc, prog_bar=False, logger=True, on_step=True, on_epoch=True)
+            return discloss
+
+    def validation_step(self, batch, batch_idx):
+        log_dict = self._validation_step(batch, batch_idx)
+        with self.ema_scope():
+            log_dict_ema = self._validation_step(batch, batch_idx, suffix="_ema")
+        return log_dict
+
+    def _validation_step(self, batch, batch_idx, suffix=""):
+        x = self.get_input(batch, self.image_key)
+        xrec, qloss, ind = self(x, return_pred_indices=True)
+        aeloss, log_dict_ae = self.loss(qloss, x, xrec, 0,
+                                        self.global_step,
+                                        last_layer=self.get_last_layer(),
+                                        split="val"+suffix,
+                                        predicted_indices=ind
+                                        )
+
+        discloss, log_dict_disc = self.loss(qloss, x, xrec, 1,
+                                            self.global_step,
+                                            last_layer=self.get_last_layer(),
+                                            split="val"+suffix,
+                                            predicted_indices=ind
+                                            )
+        rec_loss = log_dict_ae[f"val{suffix}/rec_loss"]
+        self.log(f"val{suffix}/rec_loss", rec_loss,
+                   prog_bar=True, logger=True, on_step=False, on_epoch=True, sync_dist=True)
+        self.log(f"val{suffix}/aeloss", aeloss,
+                   prog_bar=True, logger=True, on_step=False, on_epoch=True, sync_dist=True)
+        if version.parse(pl.__version__) >= version.parse('1.4.0'):
+            del log_dict_ae[f"val{suffix}/rec_loss"]
+        self.log_dict(log_dict_ae)
+        self.log_dict(log_dict_disc)
+        return self.log_dict
+
+    def configure_optimizers(self):
+        lr_d = self.learning_rate
+        lr_g = self.lr_g_factor*self.learning_rate
+        print("lr_d", lr_d)
+        print("lr_g", lr_g)
+        opt_ae = torch.optim.Adam(list(self.encoder.parameters())+
+                                  list(self.decoder.parameters())+
+                                  list(self.quantize.parameters())+
+                                  list(self.quant_conv.parameters())+
+                                  list(self.post_quant_conv.parameters()),
+                                  lr=lr_g, betas=(0.5, 0.9))
+        opt_disc = torch.optim.Adam(self.loss.discriminator.parameters(),
+                                    lr=lr_d, betas=(0.5, 0.9))
+
+        if self.scheduler_config is not None:
+            scheduler = instantiate_from_config(self.scheduler_config)
+
+            print("Setting up LambdaLR scheduler...")
+            scheduler = [
+                {
+                    'scheduler': LambdaLR(opt_ae, lr_lambda=scheduler.schedule),
+                    'interval': 'step',
+                    'frequency': 1
+                },
+                {
+                    'scheduler': LambdaLR(opt_disc, lr_lambda=scheduler.schedule),
+                    'interval': 'step',
+                    'frequency': 1
+                },
+            ]
+            return [opt_ae, opt_disc], scheduler
+        return [opt_ae, opt_disc], []
+
+    def get_last_layer(self):
+        return self.decoder.conv_out.weight
+
+    def log_images(self, batch, only_inputs=False, plot_ema=False, **kwargs):
+        log = dict()
+        x = self.get_input(batch, self.image_key)
+        x = x.to(self.device)
+        if only_inputs:
+            log["inputs"] = x
+            return log
+        xrec, _ = self(x)
+        if x.shape[1] > 3:
+            # colorize with random projection
+            assert xrec.shape[1] > 3
+            x = self.to_rgb(x)
+            xrec = self.to_rgb(xrec)
+        log["inputs"] = x
+        log["reconstructions"] = xrec
+        if plot_ema:
+            with self.ema_scope():
+                xrec_ema, _ = self(x)
+                if x.shape[1] > 3: xrec_ema = self.to_rgb(xrec_ema)
+                log["reconstructions_ema"] = xrec_ema
+        return log
+
+    def to_rgb(self, x):
+        assert self.image_key == "segmentation"
+        if not hasattr(self, "colorize"):
+            self.register_buffer("colorize", torch.randn(3, x.shape[1], 1, 1).to(x))
+        x = F.conv2d(x, weight=self.colorize)
+        x = 2.*(x-x.min())/(x.max()-x.min()) - 1.
+        return x
+
+
+class VQModelInterface(VQModel):
+    def __init__(self, embed_dim, *args, **kwargs):
+        super().__init__(embed_dim=embed_dim, *args, **kwargs)
+        self.embed_dim = embed_dim
+
+    def encode(self, x):
+        h = self.encoder(x)
+        h = self.quant_conv(h)
+        return h
+
+    def decode(self, h, force_not_quantize=False):
+        # also go through quantization layer
+        if not force_not_quantize:
+            quant, emb_loss, info = self.quantize(h)
+        else:
+            quant = h
+        quant = self.post_quant_conv(quant)
+        dec = self.decoder(quant)
+        return dec
+
+
+class AutoencoderKL(pl.LightningModule):
+    def __init__(self,
+                 ddconfig,
+                 lossconfig,
+                 embed_dim,
+                 ckpt_path=None,
+                 ignore_keys=[],
+                 image_key="image",
+                 colorize_nlabels=None,
+                 monitor=None,
+                 ):
+        super().__init__()
+        self.image_key = image_key
+        self.encoder = Encoder(**ddconfig)
+        self.decoder = Decoder(**ddconfig)
+        self.loss = instantiate_from_config(lossconfig)
+        assert ddconfig["double_z"]
+        self.quant_conv = torch.nn.Conv2d(2*ddconfig["z_channels"], 2*embed_dim, 1)
+        self.post_quant_conv = torch.nn.Conv2d(embed_dim, ddconfig["z_channels"], 1)
+        self.embed_dim = embed_dim
+        if colorize_nlabels is not None:
+            assert type(colorize_nlabels)==int
+            self.register_buffer("colorize", torch.randn(3, colorize_nlabels, 1, 1))
+        if monitor is not None:
+            self.monitor = monitor
+        if ckpt_path is not None:
+            self.init_from_ckpt(ckpt_path, ignore_keys=ignore_keys)
+
+    def init_from_ckpt(self, path, ignore_keys=list()):
+        sd = torch.load(path, map_location="cpu")["state_dict"]
+        keys = list(sd.keys())
+        for k in keys:
+            for ik in ignore_keys:
+                if k.startswith(ik):
+                    print("Deleting key {} from state_dict.".format(k))
+                    del sd[k]
+        self.load_state_dict(sd, strict=False)
+        print(f"Restored from {path}")
+
+    def encode(self, x):
+        h = self.encoder(x)
+        moments = self.quant_conv(h)
+        posterior = DiagonalGaussianDistribution(moments)
+        return posterior
+
+    def decode(self, z):
+        z = self.post_quant_conv(z)
+        dec = self.decoder(z)
+        return dec
+
+    def forward(self, input, sample_posterior=True):
+        posterior = self.encode(input)
+        if sample_posterior:
+            z = posterior.sample()
+        else:
+            z = posterior.mode()
+        dec = self.decode(z)
+        return dec, posterior
+
+    def get_input(self, batch, k):
+        x = batch[k]
+        if len(x.shape) == 3:
+            x = x[..., None]
+        x = x.permute(0, 3, 1, 2).to(memory_format=torch.contiguous_format).float()
+        return x
+
+    def training_step(self, batch, batch_idx, optimizer_idx):
+        inputs = self.get_input(batch, self.image_key)
+        reconstructions, posterior = self(inputs)
+
+        if optimizer_idx == 0:
+            # train encoder+decoder+logvar
+            aeloss, log_dict_ae = self.loss(inputs, reconstructions, posterior, optimizer_idx, self.global_step,
+                                            last_layer=self.get_last_layer(), split="train")
+            self.log("aeloss", aeloss, prog_bar=True, logger=True, on_step=True, on_epoch=True)
+            self.log_dict(log_dict_ae, prog_bar=False, logger=True, on_step=True, on_epoch=False)
+            return aeloss
+
+        if optimizer_idx == 1:
+            # train the discriminator
+            discloss, log_dict_disc = self.loss(inputs, reconstructions, posterior, optimizer_idx, self.global_step,
+                                                last_layer=self.get_last_layer(), split="train")
+
+            self.log("discloss", discloss, prog_bar=True, logger=True, on_step=True, on_epoch=True)
+            self.log_dict(log_dict_disc, prog_bar=False, logger=True, on_step=True, on_epoch=False)
+            return discloss
+
+    def validation_step(self, batch, batch_idx):
+        inputs = self.get_input(batch, self.image_key)
+        reconstructions, posterior = self(inputs)
+        aeloss, log_dict_ae = self.loss(inputs, reconstructions, posterior, 0, self.global_step,
+                                        last_layer=self.get_last_layer(), split="val")
+
+        discloss, log_dict_disc = self.loss(inputs, reconstructions, posterior, 1, self.global_step,
+                                            last_layer=self.get_last_layer(), split="val")
+
+        self.log("val/rec_loss", log_dict_ae["val/rec_loss"])
+        self.log_dict(log_dict_ae)
+        self.log_dict(log_dict_disc)
+        return self.log_dict
+
+    def configure_optimizers(self):
+        lr = self.learning_rate
+        opt_ae = torch.optim.Adam(list(self.encoder.parameters())+
+                                  list(self.decoder.parameters())+
+                                  list(self.quant_conv.parameters())+
+                                  list(self.post_quant_conv.parameters()),
+                                  lr=lr, betas=(0.5, 0.9))
+        opt_disc = torch.optim.Adam(self.loss.discriminator.parameters(),
+                                    lr=lr, betas=(0.5, 0.9))
+        return [opt_ae, opt_disc], []
+
+    def get_last_layer(self):
+        return self.decoder.conv_out.weight
+
+    @torch.no_grad()
+    def log_images(self, batch, only_inputs=False, **kwargs):
+        log = dict()
+        x = self.get_input(batch, self.image_key)
+        x = x.to(self.device)
+        if not only_inputs:
+            xrec, posterior = self(x)
+            if x.shape[1] > 3:
+                # colorize with random projection
+                assert xrec.shape[1] > 3
+                x = self.to_rgb(x)
+                xrec = self.to_rgb(xrec)
+            log["samples"] = self.decode(torch.randn_like(posterior.sample()))
+            log["reconstructions"] = xrec
+        log["inputs"] = x
+        return log
+
+    def to_rgb(self, x):
+        assert self.image_key == "segmentation"
+        if not hasattr(self, "colorize"):
+            self.register_buffer("colorize", torch.randn(3, x.shape[1], 1, 1).to(x))
+        x = F.conv2d(x, weight=self.colorize)
+        x = 2.*(x-x.min())/(x.max()-x.min()) - 1.
+        return x
+
+
+class IdentityFirstStage(torch.nn.Module):
+    def __init__(self, *args, vq_interface=False, **kwargs):
+        self.vq_interface = vq_interface  # TODO: Should be true by default but check to not break older stuff
+        super().__init__()
+
+    def encode(self, x, *args, **kwargs):
+        return x
+
+    def decode(self, x, *args, **kwargs):
+        return x
+
+    def quantize(self, x, *args, **kwargs):
+        if self.vq_interface:
+            return x, None, [None, None, None]
+        return x
+
+    def forward(self, x, *args, **kwargs):
+        return x

ldm/models/diffusion/sync_dreamer.py

@@ -0,0 +1,665 @@
+from pathlib import Path
+
+import pytorch_lightning as pl
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+import numpy as np
+from skimage.io import imsave
+from torch.optim.lr_scheduler import LambdaLR
+from tqdm import tqdm
+
+from ldm.base_utils import read_pickle, concat_images_list
+from ldm.models.diffusion.sync_dreamer_utils import get_warp_coordinates, create_target_volume
+from ldm.models.diffusion.sync_dreamer_network import NoisyTargetViewEncoder, SpatialTime3DNet, FrustumTV3DNet
+from ldm.modules.diffusionmodules.util import make_ddim_timesteps, timestep_embedding
+from ldm.modules.encoders.modules import FrozenCLIPImageEmbedder
+from ldm.util import instantiate_from_config
+
+def disabled_train(self, mode=True):
+    """Overwrite model.train with this function to make sure train/eval mode
+    does not change anymore."""
+    return self
+
+def disable_training_module(module: nn.Module):
+    module = module.eval()
+    module.train = disabled_train
+    for para in module.parameters():
+        para.requires_grad = False
+    return module
+
+def repeat_to_batch(tensor, B, VN):
+    t_shape = tensor.shape
+    ones = [1 for _ in range(len(t_shape)-1)]
+    tensor_new = tensor.view(B,1,*t_shape[1:]).repeat(1,VN,*ones).view(B*VN,*t_shape[1:])
+    return tensor_new
+
+class UNetWrapper(nn.Module):
+    def __init__(self, diff_model_config, drop_conditions=False, drop_scheme='default', use_zero_123=True):
+        super().__init__()
+        self.diffusion_model = instantiate_from_config(diff_model_config)
+        self.drop_conditions = drop_conditions
+        self.drop_scheme=drop_scheme
+        self.use_zero_123 = use_zero_123
+
+
+    def drop(self, cond, mask):
+        shape = cond.shape
+        B = shape[0]
+        cond = mask.view(B,*[1 for _ in range(len(shape)-1)]) * cond
+        return cond
+
+    def get_trainable_parameters(self):
+        return self.diffusion_model.get_trainable_parameters()
+
+    def get_drop_scheme(self, B, device):
+        if self.drop_scheme=='default':
+            random = torch.rand(B, dtype=torch.float32, device=device)
+            drop_clip = (random > 0.15) & (random <= 0.2)
+            drop_volume = (random > 0.1) & (random <= 0.15)
+            drop_concat = (random > 0.05) & (random <= 0.1)
+            drop_all = random <= 0.05
+        else:
+            raise NotImplementedError
+        return drop_clip, drop_volume, drop_concat, drop_all
+
+    def forward(self, x, t, clip_embed, volume_feats, x_concat, is_train=False):
+        """
+
+        @param x:             B,4,H,W
+        @param t:             B,
+        @param clip_embed:    B,M,768
+        @param volume_feats:  B,C,D,H,W
+        @param x_concat:      B,C,H,W
+        @param is_train:
+        @return:
+        """
+        if self.drop_conditions and is_train:
+            B = x.shape[0]
+            drop_clip, drop_volume, drop_concat, drop_all = self.get_drop_scheme(B, x.device)
+
+            clip_mask = 1.0 - (drop_clip | drop_all).float()
+            clip_embed = self.drop(clip_embed, clip_mask)
+
+            volume_mask = 1.0 - (drop_volume | drop_all).float()
+            for k, v in volume_feats.items():
+                volume_feats[k] = self.drop(v, mask=volume_mask)
+
+            concat_mask = 1.0 - (drop_concat | drop_all).float()
+            x_concat = self.drop(x_concat, concat_mask)
+
+        if self.use_zero_123:
+            # zero123 does not multiply this when encoding, maybe a bug for zero123
+            first_stage_scale_factor = 0.18215
+            x_concat_ = x_concat * 1.0
+            x_concat_[:, :4] = x_concat_[:, :4] / first_stage_scale_factor
+        else:
+            x_concat_ = x_concat
+
+        x = torch.cat([x, x_concat_], 1)
+        pred = self.diffusion_model(x, t, clip_embed, source_dict=volume_feats)
+        return pred
+
+    def predict_with_unconditional_scale(self, x, t, clip_embed, volume_feats, x_concat, unconditional_scale):
+        x_ = torch.cat([x] * 2, 0)
+        t_ = torch.cat([t] * 2, 0)
+        clip_embed_ = torch.cat([clip_embed, torch.zeros_like(clip_embed)], 0)
+
+        v_ = {}
+        for k, v in volume_feats.items():
+            v_[k] = torch.cat([v, torch.zeros_like(v)], 0)
+
+        x_concat_ = torch.cat([x_concat, torch.zeros_like(x_concat)], 0)
+        if self.use_zero_123:
+            # zero123 does not multiply this when encoding, maybe a bug for zero123
+            first_stage_scale_factor = 0.18215
+            x_concat_[:, :4] = x_concat_[:, :4] / first_stage_scale_factor
+        x_ = torch.cat([x_, x_concat_], 1)
+        s, s_uc = self.diffusion_model(x_, t_, clip_embed_, source_dict=v_).chunk(2)
+        s = s_uc + unconditional_scale * (s - s_uc)
+        return s
+
+
+class SpatialVolumeNet(nn.Module):
+    def __init__(self, time_dim, view_dim, view_num,
+                 input_image_size=256, frustum_volume_depth=48,
+                 spatial_volume_size=32, spatial_volume_length=0.5,
+                 frustum_volume_length=0.86603 # sqrt(3)/2
+                 ):
+        super().__init__()
+        self.target_encoder = NoisyTargetViewEncoder(time_dim, view_dim, output_dim=16)
+        self.spatial_volume_feats = SpatialTime3DNet(input_dim=16 * view_num, time_dim=time_dim, dims=(64, 128, 256, 512))
+        self.frustum_volume_feats = FrustumTV3DNet(64, time_dim, view_dim, dims=(64, 128, 256, 512))
+
+        self.frustum_volume_length = frustum_volume_length
+        self.input_image_size = input_image_size
+        self.spatial_volume_size = spatial_volume_size
+        self.spatial_volume_length = spatial_volume_length
+
+        self.frustum_volume_size = self.input_image_size // 8
+        self.frustum_volume_depth = frustum_volume_depth
+        self.time_dim = time_dim
+        self.view_dim = view_dim
+        self.default_origin_depth = 1.5 # our rendered images are 1.5 away from the origin, we assume camera is 1.5 away from the origin
+
+    def construct_spatial_volume(self, x, t_embed, v_embed, target_poses, target_Ks):
+        """
+        @param x:            B,N,4,H,W
+        @param t_embed:      B,t_dim
+        @param v_embed:      B,N,v_dim
+        @param target_poses: N,3,4
+        @param target_Ks:    N,3,3
+        @return:
+        """
+        B, N, _, H, W = x.shape
+        V = self.spatial_volume_size
+        device = x.device
+
+        spatial_volume_verts = torch.linspace(-self.spatial_volume_length, self.spatial_volume_length, V, dtype=torch.float32, device=device)
+        spatial_volume_verts = torch.stack(torch.meshgrid(spatial_volume_verts, spatial_volume_verts, spatial_volume_verts), -1)
+        spatial_volume_verts = spatial_volume_verts.reshape(1, V ** 3, 3)[:, :, (2, 1, 0)]
+        spatial_volume_verts = spatial_volume_verts.view(1, V, V, V, 3).permute(0, 4, 1, 2, 3).repeat(B, 1, 1, 1, 1)
+
+        # encode source features
+        t_embed_ = t_embed.view(B, 1, self.time_dim).repeat(1, N, 1).view(B, N, self.time_dim)
+        # v_embed_ = v_embed.view(1, N, self.view_dim).repeat(B, 1, 1).view(B, N, self.view_dim)
+        v_embed_ = v_embed
+        target_Ks = target_Ks.unsqueeze(0).repeat(B, 1, 1, 1)
+        target_poses = target_poses.unsqueeze(0).repeat(B, 1, 1, 1)
+
+        # extract 2D image features
+        spatial_volume_feats = []
+        # project source features
+        for ni in range(0, N):
+            pose_source_ = target_poses[:, ni]
+            K_source_ = target_Ks[:, ni]
+            x_ = self.target_encoder(x[:, ni], t_embed_[:, ni], v_embed_[:, ni])
+            C = x_.shape[1]
+
+            coords_source = get_warp_coordinates(spatial_volume_verts, x_.shape[-1], self.input_image_size, K_source_, pose_source_).view(B, V, V * V, 2)
+            unproj_feats_ = F.grid_sample(x_, coords_source, mode='bilinear', padding_mode='zeros', align_corners=True)
+            unproj_feats_ = unproj_feats_.view(B, C, V, V, V)
+            spatial_volume_feats.append(unproj_feats_)
+
+        spatial_volume_feats = torch.stack(spatial_volume_feats, 1) # B,N,C,V,V,V
+        N = spatial_volume_feats.shape[1]
+        spatial_volume_feats = spatial_volume_feats.view(B, N*C, V, V, V)
+
+        spatial_volume_feats = self.spatial_volume_feats(spatial_volume_feats, t_embed)  # b,64,32,32,32
+        return spatial_volume_feats
+
+    def construct_view_frustum_volume(self, spatial_volume, t_embed, v_embed, poses, Ks, target_indices):
+        """
+        @param spatial_volume:    B,C,V,V,V
+        @param t_embed:           B,t_dim
+        @param v_embed:           B,N,v_dim
+        @param poses:             N,3,4
+        @param Ks:                N,3,3
+        @param target_indices:    B,TN
+        @return: B*TN,C,H,W
+        """
+        B, TN = target_indices.shape
+        H, W = self.frustum_volume_size, self.frustum_volume_size
+        D = self.frustum_volume_depth
+        V = self.spatial_volume_size
+
+        near = torch.ones(B * TN, 1, H, W, dtype=spatial_volume.dtype, device=spatial_volume.device) * self.default_origin_depth - self.frustum_volume_length
+        far = torch.ones(B * TN, 1, H, W, dtype=spatial_volume.dtype, device=spatial_volume.device) * self.default_origin_depth + self.frustum_volume_length
+
+        target_indices = target_indices.view(B*TN) # B*TN
+        poses_ = poses[target_indices] # B*TN,3,4
+        Ks_ = Ks[target_indices] # B*TN,3,4
+        volume_xyz, volume_depth = create_target_volume(D, self.frustum_volume_size, self.input_image_size, poses_, Ks_, near, far) # B*TN,3 or 1,D,H,W
+
+        volume_xyz_ = volume_xyz / self.spatial_volume_length  # since the spatial volume is constructed in [-spatial_volume_length,spatial_volume_length]
+        volume_xyz_ = volume_xyz_.permute(0, 2, 3, 4, 1)  # B*TN,D,H,W,3
+        spatial_volume_ = spatial_volume.unsqueeze(1).repeat(1, TN, 1, 1, 1, 1).view(B * TN, -1, V, V, V)
+        volume_feats = F.grid_sample(spatial_volume_, volume_xyz_, mode='bilinear', padding_mode='zeros', align_corners=True) # B*TN,C,D,H,W
+
+        v_embed_ = v_embed[torch.arange(B)[:,None], target_indices.view(B,TN)].view(B*TN, -1) # B*TN
+        t_embed_ = t_embed.unsqueeze(1).repeat(1,TN,1).view(B*TN,-1)
+        volume_feats_dict = self.frustum_volume_feats(volume_feats, t_embed_, v_embed_)
+        return volume_feats_dict, volume_depth
+
+class SyncMultiviewDiffusion(pl.LightningModule):
+    def __init__(self, unet_config, scheduler_config,
+                 finetune_unet=False, finetune_projection=True,
+                 view_num=16, image_size=256,
+                 cfg_scale=3.0, output_num=8, batch_view_num=4,
+                 drop_conditions=False, drop_scheme='default',
+                 clip_image_encoder_path="/apdcephfs/private_rondyliu/projects/clip/ViT-L-14.pt"):
+        super().__init__()
+
+        self.finetune_unet = finetune_unet
+        self.finetune_projection = finetune_projection
+
+        self.view_num = view_num
+        self.viewpoint_dim = 4
+        self.output_num = output_num
+        self.image_size = image_size
+
+        self.batch_view_num = batch_view_num
+        self.cfg_scale = cfg_scale
+
+        self.clip_image_encoder_path = clip_image_encoder_path
+
+        self._init_time_step_embedding()
+        self._init_first_stage()
+        self._init_schedule()
+        self._init_multiview()
+        self._init_clip_image_encoder()
+        self._init_clip_projection()
+
+        self.spatial_volume = SpatialVolumeNet(self.time_embed_dim, self.viewpoint_dim, self.view_num)
+        self.model = UNetWrapper(unet_config, drop_conditions=drop_conditions, drop_scheme=drop_scheme)
+        self.scheduler_config = scheduler_config
+
+        latent_size = image_size//8
+        self.ddim = SyncDDIMSampler(self, 200, "uniform", 1.0, latent_size=latent_size)
+
+    def _init_clip_projection(self):
+        self.cc_projection = nn.Linear(772, 768)
+        nn.init.eye_(list(self.cc_projection.parameters())[0][:768, :768])
+        nn.init.zeros_(list(self.cc_projection.parameters())[1])
+        self.cc_projection.requires_grad_(True)
+
+        if not self.finetune_projection:
+            disable_training_module(self.cc_projection)
+
+    def _init_multiview(self):
+        K, azs, _, _, poses = read_pickle(f'meta_info/camera-{self.view_num}.pkl')
+        default_image_size = 256
+        ratio = self.image_size/default_image_size
+        K = np.diag([ratio,ratio,1]) @ K
+        K = torch.from_numpy(K.astype(np.float32)) # [3,3]
+        K = K.unsqueeze(0).repeat(self.view_num,1,1)        # N,3,3
+        poses = torch.from_numpy(poses.astype(np.float32))  # N,3,4
+        self.register_buffer('poses', poses)
+        self.register_buffer('Ks', K)
+        azs = (azs + np.pi) % (np.pi * 2) - np.pi # scale to [-pi,pi] and the index=0 has az=0
+        self.register_buffer('azimuth', torch.from_numpy(azs.astype(np.float32)))
+
+    def get_viewpoint_embedding(self, batch_size, elevation_ref):
+        """
+        @param batch_size:
+        @param elevation_ref: B
+        @return:
+        """
+        azimuth_input = self.azimuth[0].unsqueeze(0) # 1
+        azimuth_target = self.azimuth # N
+        elevation_input = -elevation_ref # note that zero123 use a negative elevation here!!!
+        elevation_target = -np.deg2rad(30)
+        d_e = elevation_target - elevation_input # B
+        N = self.azimuth.shape[0]
+        B = batch_size
+        d_e = d_e.unsqueeze(1).repeat(1, N)
+        d_a = azimuth_target - azimuth_input # N
+        d_a = d_a.unsqueeze(0).repeat(B, 1)
+        d_z = torch.zeros_like(d_a)
+        embedding = torch.stack([d_e, torch.sin(d_a), torch.cos(d_a), d_z], -1) # B,N,4
+        return embedding
+
+    def _init_first_stage(self):
+        first_stage_config={
+            "target": "ldm.models.autoencoder.AutoencoderKL",
+            "params": {
+                "embed_dim": 4,
+                "monitor": "val/rec_loss",
+                "ddconfig":{
+                  "double_z": True,
+                  "z_channels": 4,
+                  "resolution": self.image_size,
+                  "in_channels": 3,
+                  "out_ch": 3,
+                  "ch": 128,
+                  "ch_mult": [1,2,4,4],
+                  "num_res_blocks": 2,
+                  "attn_resolutions": [],
+                  "dropout": 0.0
+                },
+                "lossconfig": {"target": "torch.nn.Identity"},
+            }
+        }
+        self.first_stage_scale_factor = 0.18215
+        self.first_stage_model = instantiate_from_config(first_stage_config)
+        self.first_stage_model = disable_training_module(self.first_stage_model)
+
+    def _init_clip_image_encoder(self):
+        self.clip_image_encoder = FrozenCLIPImageEmbedder(model=self.clip_image_encoder_path)
+        self.clip_image_encoder = disable_training_module(self.clip_image_encoder)
+
+    def _init_schedule(self):
+        self.num_timesteps = 1000
+        linear_start = 0.00085
+        linear_end = 0.0120
+        num_timesteps = 1000
+        betas = torch.linspace(linear_start ** 0.5, linear_end ** 0.5, num_timesteps, dtype=torch.float32) ** 2 # T
+        assert betas.shape[0] == self.num_timesteps
+
+        # all in float64 first
+        alphas = 1. - betas
+        alphas_cumprod = torch.cumprod(alphas, dim=0) # T
+        alphas_cumprod_prev = torch.cat([torch.ones(1, dtype=torch.float64), alphas_cumprod[:-1]], 0)
+        posterior_variance = betas * (1. - alphas_cumprod_prev) / (1. - alphas_cumprod) # T
+        posterior_log_variance_clipped = torch.log(torch.clamp(posterior_variance, min=1e-20))
+        posterior_log_variance_clipped = torch.clamp(posterior_log_variance_clipped, min=-10)
+
+        self.register_buffer("betas", betas.float())
+        self.register_buffer("alphas", alphas.float())
+        self.register_buffer("alphas_cumprod", alphas_cumprod.float())
+        self.register_buffer("sqrt_alphas_cumprod", torch.sqrt(alphas_cumprod).float())
+        self.register_buffer("sqrt_one_minus_alphas_cumprod", torch.sqrt(1 - alphas_cumprod).float())
+        self.register_buffer("posterior_variance", posterior_variance.float())
+        self.register_buffer('posterior_log_variance_clipped', posterior_log_variance_clipped.float())
+
+    def _init_time_step_embedding(self):
+        self.time_embed_dim = 256
+        self.time_embed = nn.Sequential(
+            nn.Linear(self.time_embed_dim, self.time_embed_dim),
+            nn.SiLU(True),
+            nn.Linear(self.time_embed_dim, self.time_embed_dim),
+        )
+
+    def encode_first_stage(self, x, sample=True):
+        with torch.no_grad():
+            posterior = self.first_stage_model.encode(x)  # b,4,h//8,w//8
+            if sample:
+                return posterior.sample().detach() * self.first_stage_scale_factor
+            else:
+                return posterior.mode().detach() * self.first_stage_scale_factor
+
+    def decode_first_stage(self, z):
+        with torch.no_grad():
+            z = 1. / self.first_stage_scale_factor * z
+            return self.first_stage_model.decode(z)
+
+    def prepare(self, batch):
+        # encode target
+        if 'target_image' in batch:
+            image_target = batch['target_image'].permute(0, 1, 4, 2, 3) # b,n,3,h,w
+            N = image_target.shape[1]
+            x = [self.encode_first_stage(image_target[:,ni], True) for ni in range(N)]
+            x = torch.stack(x, 1) # b,n,4,h//8,w//8
+        else:
+            x = None
+
+        image_input = batch['input_image'].permute(0, 3, 1, 2)
+        elevation_input = batch['input_elevation'][:, 0] # b
+        x_input = self.encode_first_stage(image_input)
+        input_info = {'image': image_input, 'elevation': elevation_input, 'x': x_input}
+        with torch.no_grad():
+            clip_embed = self.clip_image_encoder.encode(image_input)
+        return x, clip_embed, input_info
+
+    def embed_time(self, t):
+        t_embed = timestep_embedding(t, self.time_embed_dim, repeat_only=False) # B,TED
+        t_embed = self.time_embed(t_embed) # B,TED
+        return t_embed
+
+    def get_target_view_feats(self, x_input, spatial_volume, clip_embed, t_embed, v_embed, target_index):
+        """
+        @param x_input:        B,4,H,W
+        @param spatial_volume: B,C,V,V,V
+        @param clip_embed:     B,1,768
+        @param t_embed:        B,t_dim
+        @param v_embed:        B,N,v_dim
+        @param target_index:   B,TN
+        @return:
+            tensors of size B*TN,*
+        """
+        B, _, H, W = x_input.shape
+        frustum_volume_feats, frustum_volume_depth = self.spatial_volume.construct_view_frustum_volume(spatial_volume, t_embed, v_embed, self.poses, self.Ks, target_index)
+
+        # clip
+        TN = target_index.shape[1]
+        v_embed_ = v_embed[torch.arange(B)[:,None], target_index].view(B*TN, self.viewpoint_dim) # B*TN,v_dim
+        clip_embed_ = clip_embed.unsqueeze(1).repeat(1,TN,1,1).view(B*TN,1,768)
+        clip_embed_ = self.cc_projection(torch.cat([clip_embed_, v_embed_.unsqueeze(1)], -1))  # B*TN,1,768
+
+        x_input_ = x_input.unsqueeze(1).repeat(1, TN, 1, 1, 1).view(B * TN, 4, H, W)
+
+        x_concat = x_input_
+        return clip_embed_, frustum_volume_feats, x_concat
+
+    def training_step(self, batch):
+        B = batch['target_image'].shape[0]
+        time_steps = torch.randint(0, self.num_timesteps, (B,), device=self.device).long()
+
+        x, clip_embed, input_info = self.prepare(batch)
+        x_noisy, noise = self.add_noise(x, time_steps)  # B,N,4,H,W
+
+        N = self.view_num
+        target_index = torch.randint(0, N, (B, 1), device=self.device).long() # B, 1
+        v_embed = self.get_viewpoint_embedding(B, input_info['elevation']) # N,v_dim
+
+        t_embed = self.embed_time(time_steps)
+        spatial_volume = self.spatial_volume.construct_spatial_volume(x_noisy, t_embed, v_embed, self.poses, self.Ks)
+
+        clip_embed, volume_feats, x_concat = self.get_target_view_feats(input_info['x'], spatial_volume, clip_embed, t_embed, v_embed, target_index)
+
+        x_noisy_ = x_noisy[torch.arange(B)[:,None],target_index][:,0] # B,4,H,W
+        noise_predict = self.model(x_noisy_, time_steps, clip_embed, volume_feats, x_concat, is_train=True) # B,4,H,W
+
+        noise_target = noise[torch.arange(B)[:,None],target_index][:,0] # B,4,H,W
+        # loss simple for diffusion
+        loss_simple = torch.nn.functional.mse_loss(noise_target, noise_predict, reduction='none')
+        loss = loss_simple.mean()
+        self.log('sim', loss_simple.mean(), prog_bar=True, logger=True, on_step=True, on_epoch=True, rank_zero_only=True)
+
+        # log others
+        lr = self.optimizers().param_groups[0]['lr']
+        self.log('lr', lr, prog_bar=True, logger=True, on_step=True, on_epoch=False, rank_zero_only=True)
+        self.log("step", self.global_step, prog_bar=True, logger=True, on_step=True, on_epoch=False, rank_zero_only=True)
+        return loss
+
+    def add_noise(self, x_start, t):
+        """
+        @param x_start: B,*
+        @param t:       B,
+        @return:
+        """
+        B = x_start.shape[0]
+        noise = torch.randn_like(x_start) # B,*
+
+        sqrt_alphas_cumprod_  = self.sqrt_alphas_cumprod[t] # B,
+        sqrt_one_minus_alphas_cumprod_ = self.sqrt_one_minus_alphas_cumprod[t] # B
+        sqrt_alphas_cumprod_ = sqrt_alphas_cumprod_.view(B, *[1 for _ in range(len(x_start.shape)-1)])
+        sqrt_one_minus_alphas_cumprod_ = sqrt_one_minus_alphas_cumprod_.view(B, *[1 for _ in range(len(x_start.shape)-1)])
+        x_noisy = sqrt_alphas_cumprod_ * x_start + sqrt_one_minus_alphas_cumprod_ * noise
+        return x_noisy, noise
+
+    def sample(self, batch, cfg_scale, batch_view_num, use_ddim=True,
+               return_inter_results=False, inter_interval=50, inter_view_interval=2):
+        _, clip_embed, input_info = self.prepare(batch)
+        if use_ddim:
+            x_sample, inter = self.ddim.sample(input_info, clip_embed, unconditional_scale=cfg_scale, log_every_t=inter_interval, batch_view_num=batch_view_num)
+        else:
+            raise NotImplementedError
+
+        N = x_sample.shape[1]
+        x_sample = torch.stack([self.decode_first_stage(x_sample[:, ni]) for ni in range(N)], 1)
+        if return_inter_results:
+            torch.cuda.synchronize()
+            torch.cuda.empty_cache()
+            inter = torch.stack(inter['x_inter'], 2) # # B,N,T,C,H,W
+            B,N,T,C,H,W = inter.shape
+            inter_results = []
+            for ni in tqdm(range(0, N, inter_view_interval)):
+                inter_results_ = []
+                for ti in range(T):
+                    inter_results_.append(self.decode_first_stage(inter[:, ni, ti]))
+                inter_results.append(torch.stack(inter_results_, 1)) # B,T,3,H,W
+            inter_results = torch.stack(inter_results,1) # B,N,T,3,H,W
+            return x_sample, inter_results
+        else:
+            return x_sample
+
+    def log_image(self,  x_sample, batch, step, output_dir):
+        process = lambda x: ((torch.clip(x, min=-1, max=1).cpu().numpy() * 0.5 + 0.5) * 255).astype(np.uint8)
+        B = x_sample.shape[0]
+        N = x_sample.shape[1]
+        image_cond = []
+        for bi in range(B):
+            img_pr_ = concat_images_list(process(batch['input_image'][bi]),*[process(x_sample[bi, ni].permute(1, 2, 0)) for ni in range(N)])
+            image_cond.append(img_pr_)
+
+        output_dir = Path(output_dir)
+        imsave(str(output_dir/f'{step}.jpg'), concat_images_list(*image_cond, vert=True))
+
+    @torch.no_grad()
+    def validation_step(self, batch, batch_idx):
+        if batch_idx==0 and self.global_rank==0:
+            self.eval()
+            step = self.global_step
+            batch_ = {}
+            for k, v in batch.items(): batch_[k] = v[:self.output_num]
+            x_sample = self.sample(batch_, self.cfg_scale, self.batch_view_num)
+            output_dir = Path(self.image_dir) / 'images' / 'val'
+            output_dir.mkdir(exist_ok=True, parents=True)
+            self.log_image(x_sample, batch, step, output_dir=output_dir)
+
+    def configure_optimizers(self):
+        lr = self.learning_rate
+        print(f'setting learning rate to {lr:.4f} ...')
+        paras = []
+        if self.finetune_projection:
+            paras.append({"params": self.cc_projection.parameters(), "lr": lr},)
+        if self.finetune_unet:
+            paras.append({"params": self.model.parameters(), "lr": lr},)
+        else:
+            paras.append({"params": self.model.get_trainable_parameters(), "lr": lr},)
+
+        paras.append({"params": self.time_embed.parameters(), "lr": lr*10.0},)
+        paras.append({"params": self.spatial_volume.parameters(), "lr": lr*10.0},)
+
+        opt = torch.optim.AdamW(paras, lr=lr)
+
+        scheduler = instantiate_from_config(self.scheduler_config)
+        print("Setting up LambdaLR scheduler...")
+        scheduler = [{'scheduler': LambdaLR(opt, lr_lambda=scheduler.schedule), 'interval': 'step', 'frequency': 1}]
+        return [opt], scheduler
+
+class SyncDDIMSampler:
+    def __init__(self, model: SyncMultiviewDiffusion, ddim_num_steps, ddim_discretize="uniform", ddim_eta=0., latent_size=32):
+        super().__init__()
+        self.model = model
+        self.ddpm_num_timesteps = model.num_timesteps
+        self.latent_size = latent_size
+        self._make_schedule(ddim_num_steps, ddim_discretize, ddim_eta)
+        self.eta = ddim_eta
+
+    def _make_schedule(self,  ddim_num_steps, ddim_discretize="uniform", ddim_eta=0., verbose=True):
+        self.ddim_timesteps = make_ddim_timesteps(ddim_discr_method=ddim_discretize, num_ddim_timesteps=ddim_num_steps, num_ddpm_timesteps=self.ddpm_num_timesteps, verbose=verbose) # DT
+        ddim_timesteps_ = torch.from_numpy(self.ddim_timesteps.astype(np.int64)) # DT
+
+        alphas_cumprod = self.model.alphas_cumprod # T
+        assert alphas_cumprod.shape[0] == self.ddpm_num_timesteps, 'alphas have to be defined for each timestep'
+        self.ddim_alphas = alphas_cumprod[ddim_timesteps_].double() # DT
+        self.ddim_alphas_prev = torch.cat([alphas_cumprod[0:1], alphas_cumprod[ddim_timesteps_[:-1]]], 0) # DT
+        self.ddim_sigmas = ddim_eta * torch.sqrt((1 - self.ddim_alphas_prev) / (1 - self.ddim_alphas) * (1 - self.ddim_alphas / self.ddim_alphas_prev))
+
+        self.ddim_alphas_raw = self.model.alphas[ddim_timesteps_].float() # DT
+        self.ddim_sigmas = self.ddim_sigmas.float()
+        self.ddim_alphas = self.ddim_alphas.float()
+        self.ddim_alphas_prev = self.ddim_alphas_prev.float()
+        self.ddim_sqrt_one_minus_alphas = torch.sqrt(1. - self.ddim_alphas).float()
+
+
+    @torch.no_grad()
+    def denoise_apply_impl(self, x_target_noisy, index, noise_pred, is_step0=False):
+        """
+        @param x_target_noisy: B,N,4,H,W
+        @param index:          index
+        @param noise_pred:     B,N,4,H,W
+        @param is_step0:       bool
+        @return:
+        """
+        device = x_target_noisy.device
+        B,N,_,H,W = x_target_noisy.shape
+
+        # apply noise
+        a_t = self.ddim_alphas[index].to(device).float().view(1,1,1,1,1)
+        a_prev = self.ddim_alphas_prev[index].to(device).float().view(1,1,1,1,1)
+        sqrt_one_minus_at = self.ddim_sqrt_one_minus_alphas[index].to(device).float().view(1,1,1,1,1)
+        sigma_t = self.ddim_sigmas[index].to(device).float().view(1,1,1,1,1)
+
+        pred_x0 = (x_target_noisy - sqrt_one_minus_at * noise_pred) / a_t.sqrt()
+        dir_xt = torch.clamp(1. - a_prev - sigma_t**2, min=1e-7).sqrt() * noise_pred
+        x_prev = a_prev.sqrt() * pred_x0 + dir_xt
+        if not is_step0:
+            noise = sigma_t * torch.randn_like(x_target_noisy)
+            x_prev = x_prev + noise
+        return x_prev
+
+    @torch.no_grad()
+    def denoise_apply(self, x_target_noisy, input_info, clip_embed, time_steps, index, unconditional_scale, batch_view_num=1, is_step0=False):
+        """
+        @param x_target_noisy:   B,N,4,H,W
+        @param input_info:
+        @param clip_embed:       B,M,768
+        @param time_steps:       B,
+        @param index:            int
+        @param unconditional_scale:
+        @param batch_view_num:   int
+        @param is_step0:         bool
+        @return:
+        """
+        x_input, elevation_input = input_info['x'], input_info['elevation']
+        B, N, C, H, W = x_target_noisy.shape
+
+        # construct source data
+        v_embed = self.model.get_viewpoint_embedding(B, elevation_input) # B,N,v_dim
+        t_embed = self.model.embed_time(time_steps)  # B,t_dim
+        spatial_volume = self.model.spatial_volume.construct_spatial_volume(x_target_noisy, t_embed, v_embed, self.model.poses, self.model.Ks)
+
+        e_t = []
+        target_indices = torch.arange(N) # N
+        for ni in range(0, N, batch_view_num):
+            x_target_noisy_ = x_target_noisy[:, ni:ni + batch_view_num]
+            VN = x_target_noisy_.shape[1]
+            x_target_noisy_ = x_target_noisy_.reshape(B*VN,C,H,W)
+
+            time_steps_ = repeat_to_batch(time_steps, B, VN)
+            target_indices_ = target_indices[ni:ni+batch_view_num].unsqueeze(0).repeat(B,1)
+            clip_embed_, volume_feats_, x_concat_ = self.model.get_target_view_feats(x_input, spatial_volume, clip_embed, t_embed, v_embed, target_indices_)
+            if unconditional_scale!=1.0:
+                noise = self.model.model.predict_with_unconditional_scale(x_target_noisy_, time_steps_, clip_embed_, volume_feats_, x_concat_, unconditional_scale)
+            else:
+                noise = self.model.model(x_target_noisy_, time_steps_, clip_embed_, volume_feats_, x_concat_, is_train=False)
+            e_t.append(noise.view(B,VN,4,H,W))
+
+        e_t = torch.cat(e_t, 1)
+        x_prev = self.denoise_apply_impl(x_target_noisy, index, e_t, is_step0)
+        return x_prev
+
+    @torch.no_grad()
+    def sample(self, input_info, clip_embed, unconditional_scale=1.0, log_every_t=50, batch_view_num=1):
+        """
+        @param input_info:      x, elevation
+        @param clip_embed:      B,M,768
+        @param unconditional_scale:
+        @param log_every_t:
+        @param batch_view_num:
+        @return:
+        """
+        print(f"unconditional scale {unconditional_scale:.1f}")
+        C, H, W = 4, self.latent_size, self.latent_size
+        B = clip_embed.shape[0]
+        N = self.model.view_num
+        device = self.model.device
+        x_target_noisy = torch.randn([B, N, C, H, W], device=device)
+
+        timesteps = self.ddim_timesteps
+        intermediates = {'x_inter': []}
+        time_range = np.flip(timesteps)
+        total_steps = timesteps.shape[0]
+
+        iterator = tqdm(time_range, desc='DDIM Sampler', total=total_steps)
+        for i, step in enumerate(iterator):
+            index = total_steps - i - 1 # index in ddim state
+            time_steps = torch.full((B,), step, device=device, dtype=torch.long)
+            x_target_noisy = self.denoise_apply(x_target_noisy, input_info, clip_embed, time_steps, index, unconditional_scale, batch_view_num=batch_view_num, is_step0=index==0)
+            if index % log_every_t == 0 or index == total_steps - 1:
+                intermediates['x_inter'].append(x_target_noisy)
+
+        return x_target_noisy, intermediates

ldm/models/diffusion/sync_dreamer_attention.py

@@ -0,0 +1,142 @@
+import torch
+import torch.nn as nn
+
+from ldm.modules.attention import default, zero_module, checkpoint
+from ldm.modules.diffusionmodules.openaimodel import UNetModel
+from ldm.modules.diffusionmodules.util import timestep_embedding
+
+class DepthAttention(nn.Module):
+    def __init__(self, query_dim, context_dim, heads, dim_head, output_bias=True):
+        super().__init__()
+        inner_dim = dim_head * heads
+        context_dim = default(context_dim, query_dim)
+
+        self.scale = dim_head ** -0.5
+        self.heads = heads
+        self.dim_head = dim_head
+
+        self.to_q = nn.Conv2d(query_dim, inner_dim, 1, 1, bias=False)
+        self.to_k = nn.Conv3d(context_dim, inner_dim, 1, 1, bias=False)
+        self.to_v = nn.Conv3d(context_dim, inner_dim, 1, 1, bias=False)
+        if output_bias:
+            self.to_out = nn.Conv2d(inner_dim, query_dim, 1, 1)
+        else:
+            self.to_out = nn.Conv2d(inner_dim, query_dim, 1, 1, bias=False)
+
+    def forward(self, x, context):
+        """
+
+        @param x:        b,f0,h,w
+        @param context:  b,f1,d,h,w
+        @return:
+        """
+        hn, hd = self.heads, self.dim_head
+        b, _, h, w = x.shape
+        b, _, d, h, w = context.shape
+
+        q = self.to_q(x).reshape(b,hn,hd,h,w) # b,t,h,w
+        k = self.to_k(context).reshape(b,hn,hd,d,h,w) # b,t,d,h,w
+        v = self.to_v(context).reshape(b,hn,hd,d,h,w) # b,t,d,h,w
+
+        sim = torch.sum(q.unsqueeze(3) * k, 2) * self.scale # b,hn,d,h,w
+        attn = sim.softmax(dim=2)
+
+        # b,hn,hd,d,h,w * b,hn,1,d,h,w
+        out = torch.sum(v * attn.unsqueeze(2), 3) # b,hn,hd,h,w
+        out = out.reshape(b,hn*hd,h,w)
+        return self.to_out(out)
+
+
+class DepthTransformer(nn.Module):
+    def __init__(self, dim, n_heads, d_head, context_dim=None, checkpoint=True):
+        super().__init__()
+        inner_dim = n_heads * d_head
+        self.proj_in = nn.Sequential(
+            nn.Conv2d(dim, inner_dim, 1, 1),
+            nn.GroupNorm(8, inner_dim),
+            nn.SiLU(True),
+        )
+        self.proj_context = nn.Sequential(
+            nn.Conv3d(context_dim, context_dim, 1, 1, bias=False), # no bias
+            nn.GroupNorm(8, context_dim),
+            nn.ReLU(True), # only relu, because we want input is 0, output is 0
+        )
+        self.depth_attn = DepthAttention(query_dim=inner_dim, heads=n_heads, dim_head=d_head, context_dim=context_dim, output_bias=False)  # is a self-attention if not self.disable_self_attn
+        self.proj_out = nn.Sequential(
+            nn.GroupNorm(8, inner_dim),
+            nn.ReLU(True),
+            nn.Conv2d(inner_dim, inner_dim, 3, 1, 1, bias=False),
+            nn.GroupNorm(8, inner_dim),
+            nn.ReLU(True),
+            zero_module(nn.Conv2d(inner_dim, dim, 3, 1, 1, bias=False)),
+        )
+        self.checkpoint = checkpoint
+
+    def forward(self, x, context=None):
+        return checkpoint(self._forward, (x, context), self.parameters(), self.checkpoint)
+
+    def _forward(self, x, context):
+        x_in = x
+        x = self.proj_in(x)
+        context = self.proj_context(context)
+        x = self.depth_attn(x, context)
+        x = self.proj_out(x) + x_in
+        return x
+
+
+class DepthWiseAttention(UNetModel):
+    def __init__(self, volume_dims=(5,16,32,64), *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        # num_heads = 4
+        model_channels = kwargs['model_channels']
+        channel_mult = kwargs['channel_mult']
+        d0,d1,d2,d3 = volume_dims
+
+        # 4
+        ch = model_channels*channel_mult[2]
+        self.middle_conditions = DepthTransformer(ch, 4, d3 // 2, context_dim=d3)
+
+        self.output_conditions=nn.ModuleList()
+        self.output_b2c = {3:0,4:1,5:2,6:3,7:4,8:5,9:6,10:7,11:8}
+        # 8
+        ch = model_channels*channel_mult[2]
+        self.output_conditions.append(DepthTransformer(ch, 4, d2 // 2, context_dim=d2)) # 0
+        self.output_conditions.append(DepthTransformer(ch, 4, d2 // 2, context_dim=d2)) # 1
+        # 16
+        self.output_conditions.append(DepthTransformer(ch, 4, d1 // 2, context_dim=d1)) # 2
+        ch = model_channels*channel_mult[1]
+        self.output_conditions.append(DepthTransformer(ch, 4, d1 // 2, context_dim=d1)) # 3
+        self.output_conditions.append(DepthTransformer(ch, 4, d1 // 2, context_dim=d1)) # 4
+        # 32
+        self.output_conditions.append(DepthTransformer(ch, 4, d0 // 2, context_dim=d0)) # 5
+        ch = model_channels*channel_mult[0]
+        self.output_conditions.append(DepthTransformer(ch, 4, d0 // 2, context_dim=d0)) # 6
+        self.output_conditions.append(DepthTransformer(ch, 4, d0 // 2, context_dim=d0)) # 7
+        self.output_conditions.append(DepthTransformer(ch, 4, d0 // 2, context_dim=d0)) # 8
+
+    def forward(self, x, timesteps=None, context=None, source_dict=None, **kwargs):
+        hs = []
+        t_emb = timestep_embedding(timesteps, self.model_channels, repeat_only=False)
+        emb = self.time_embed(t_emb)
+
+        h = x.type(self.dtype)
+        for index, module in enumerate(self.input_blocks):
+            h = module(h, emb, context)
+            hs.append(h)
+
+        h = self.middle_block(h, emb, context)
+        h = self.middle_conditions(h, context=source_dict[h.shape[-1]])
+
+        for index, module in enumerate(self.output_blocks):
+            h = torch.cat([h, hs.pop()], dim=1)
+            h = module(h, emb, context)
+            if index in self.output_b2c:
+                layer = self.output_conditions[self.output_b2c[index]]
+                h = layer(h, context=source_dict[h.shape[-1]])
+
+        h = h.type(x.dtype)
+        return self.out(h)
+
+    def get_trainable_parameters(self):
+        paras = [para for para in self.middle_conditions.parameters()] + [para for para in self.output_conditions.parameters()]
+        return paras

ldm/models/diffusion/sync_dreamer_network.py

@@ -0,0 +1,186 @@
+import torch
+import torch.nn as nn
+
+class Image2DResBlockWithTV(nn.Module):
+    def __init__(self, dim, tdim, vdim):
+        super().__init__()
+        norm = lambda c: nn.GroupNorm(8, c)
+        self.time_embed = nn.Conv2d(tdim, dim, 1, 1)
+        self.view_embed = nn.Conv2d(vdim, dim, 1, 1)
+        self.conv = nn.Sequential(
+            norm(dim),
+            nn.SiLU(True),
+            nn.Conv2d(dim, dim, 3, 1, 1),
+            norm(dim),
+            nn.SiLU(True),
+            nn.Conv2d(dim, dim, 3, 1, 1),
+        )
+
+    def forward(self, x, t, v):
+        return x+self.conv(x+self.time_embed(t)+self.view_embed(v))
+
+
+class NoisyTargetViewEncoder(nn.Module):
+    def __init__(self, time_embed_dim, viewpoint_dim, run_dim=16, output_dim=8):
+        super().__init__()
+
+        self.init_conv = nn.Conv2d(4, run_dim, 3, 1, 1)
+        self.out_conv0 = Image2DResBlockWithTV(run_dim, time_embed_dim, viewpoint_dim)
+        self.out_conv1 = Image2DResBlockWithTV(run_dim, time_embed_dim, viewpoint_dim)
+        self.out_conv2 = Image2DResBlockWithTV(run_dim, time_embed_dim, viewpoint_dim)
+        self.final_out = nn.Sequential(
+            nn.GroupNorm(8, run_dim),
+            nn.SiLU(True),
+            nn.Conv2d(run_dim, output_dim, 3, 1, 1)
+        )
+
+    def forward(self, x, t, v):
+        B, DT = t.shape
+        t = t.view(B, DT, 1, 1)
+        B, DV = v.shape
+        v = v.view(B, DV, 1, 1)
+
+        x = self.init_conv(x)
+        x = self.out_conv0(x, t, v)
+        x = self.out_conv1(x, t, v)
+        x = self.out_conv2(x, t, v)
+        x = self.final_out(x)
+        return x
+
+class SpatialUpTimeBlock(nn.Module):
+    def __init__(self, x_in_dim, t_in_dim, out_dim):
+        super().__init__()
+        norm_act = lambda c: nn.GroupNorm(8, c)
+        self.t_conv = nn.Conv3d(t_in_dim, x_in_dim, 1, 1)  # 16
+        self.norm = norm_act(x_in_dim)
+        self.silu = nn.SiLU(True)
+        self.conv = nn.ConvTranspose3d(x_in_dim, out_dim, kernel_size=3, padding=1, output_padding=1, stride=2)
+
+    def forward(self, x, t):
+        x = x + self.t_conv(t)
+        return self.conv(self.silu(self.norm(x)))
+
+class SpatialTimeBlock(nn.Module):
+    def __init__(self, x_in_dim, t_in_dim, out_dim, stride):
+        super().__init__()
+        norm_act = lambda c: nn.GroupNorm(8, c)
+        self.t_conv = nn.Conv3d(t_in_dim, x_in_dim, 1, 1)  # 16
+        self.bn = norm_act(x_in_dim)
+        self.silu = nn.SiLU(True)
+        self.conv = nn.Conv3d(x_in_dim, out_dim, 3, stride=stride, padding=1)
+
+    def forward(self, x, t):
+        x = x + self.t_conv(t)
+        return self.conv(self.silu(self.bn(x)))
+
+class SpatialTime3DNet(nn.Module):
+        def __init__(self, time_dim=256, input_dim=128, dims=(32, 64, 128, 256)):
+            super().__init__()
+            d0, d1, d2, d3 = dims
+            dt = time_dim
+
+            self.init_conv = nn.Conv3d(input_dim, d0, 3, 1, 1)  # 32
+            self.conv0 = SpatialTimeBlock(d0, dt, d0, stride=1)
+
+            self.conv1 = SpatialTimeBlock(d0, dt, d1, stride=2)
+            self.conv2_0 = SpatialTimeBlock(d1, dt, d1, stride=1)
+            self.conv2_1 = SpatialTimeBlock(d1, dt, d1, stride=1)
+
+            self.conv3 = SpatialTimeBlock(d1, dt, d2, stride=2)
+            self.conv4_0 = SpatialTimeBlock(d2, dt, d2, stride=1)
+            self.conv4_1 = SpatialTimeBlock(d2, dt, d2, stride=1)
+
+            self.conv5 = SpatialTimeBlock(d2, dt, d3, stride=2)
+            self.conv6_0 = SpatialTimeBlock(d3, dt, d3, stride=1)
+            self.conv6_1 = SpatialTimeBlock(d3, dt, d3, stride=1)
+
+            self.conv7 = SpatialUpTimeBlock(d3, dt, d2)
+            self.conv8 = SpatialUpTimeBlock(d2, dt, d1)
+            self.conv9 = SpatialUpTimeBlock(d1, dt, d0)
+
+        def forward(self, x, t):
+            B, C = t.shape
+            t = t.view(B, C, 1, 1, 1)
+
+            x = self.init_conv(x)
+            conv0 = self.conv0(x, t)
+
+            x = self.conv1(conv0, t)
+            x = self.conv2_0(x, t)
+            conv2 = self.conv2_1(x, t)
+
+            x = self.conv3(conv2, t)
+            x = self.conv4_0(x, t)
+            conv4 = self.conv4_1(x, t)
+
+            x = self.conv5(conv4, t)
+            x = self.conv6_0(x, t)
+            x = self.conv6_1(x, t)
+
+            x = conv4 + self.conv7(x, t)
+            x = conv2 + self.conv8(x, t)
+            x = conv0 + self.conv9(x, t)
+            return x
+
+class FrustumTVBlock(nn.Module):
+    def __init__(self, x_dim, t_dim, v_dim, out_dim, stride):
+        super().__init__()
+        norm_act = lambda c: nn.GroupNorm(8, c)
+        self.t_conv = nn.Conv3d(t_dim, x_dim, 1, 1) # 16
+        self.v_conv = nn.Conv3d(v_dim, x_dim, 1, 1) # 16
+        self.bn = norm_act(x_dim)
+        self.silu = nn.SiLU(True)
+        self.conv = nn.Conv3d(x_dim, out_dim, 3, stride=stride, padding=1)
+
+    def forward(self, x, t, v):
+        x = x + self.t_conv(t) + self.v_conv(v)
+        return self.conv(self.silu(self.bn(x)))
+
+class FrustumTVUpBlock(nn.Module):
+    def __init__(self, x_dim, t_dim, v_dim, out_dim):
+        super().__init__()
+        norm_act = lambda c: nn.GroupNorm(8, c)
+        self.t_conv = nn.Conv3d(t_dim, x_dim, 1, 1) # 16
+        self.v_conv = nn.Conv3d(v_dim, x_dim, 1, 1) # 16
+        self.norm = norm_act(x_dim)
+        self.silu = nn.SiLU(True)
+        self.conv = nn.ConvTranspose3d(x_dim, out_dim, kernel_size=3, padding=1, output_padding=1, stride=2)
+
+    def forward(self, x, t, v):
+        x = x + self.t_conv(t) + self.v_conv(v)
+        return self.conv(self.silu(self.norm(x)))
+
+class FrustumTV3DNet(nn.Module):
+    def __init__(self, in_dim, t_dim, v_dim, dims=(32, 64, 128, 256)):
+        super().__init__()
+        self.conv0 = nn.Conv3d(in_dim, dims[0], 3, 1, 1) # 32
+
+        self.conv1 = FrustumTVBlock(dims[0], t_dim, v_dim, dims[1], 2)
+        self.conv2 = FrustumTVBlock(dims[1], t_dim, v_dim, dims[1], 1)
+
+        self.conv3 = FrustumTVBlock(dims[1], t_dim, v_dim, dims[2], 2)
+        self.conv4 = FrustumTVBlock(dims[2], t_dim, v_dim, dims[2], 1)
+
+        self.conv5 = FrustumTVBlock(dims[2], t_dim, v_dim, dims[3], 2)
+        self.conv6 = FrustumTVBlock(dims[3], t_dim, v_dim, dims[3], 1)
+
+        self.up0 = FrustumTVUpBlock(dims[3], t_dim, v_dim, dims[2])
+        self.up1 = FrustumTVUpBlock(dims[2], t_dim, v_dim, dims[1])
+        self.up2 = FrustumTVUpBlock(dims[1], t_dim, v_dim, dims[0])
+
+    def forward(self, x, t, v):
+        B,DT = t.shape
+        t = t.view(B,DT,1,1,1)
+        B,DV = v.shape
+        v = v.view(B,DV,1,1,1)
+
+        b, _, d, h, w = x.shape
+        x0 = self.conv0(x)
+        x1 = self.conv2(self.conv1(x0, t, v), t, v)
+        x2 = self.conv4(self.conv3(x1, t, v), t, v)
+        x3 = self.conv6(self.conv5(x2, t, v), t, v)
+
+        x2 = self.up0(x3, t, v) + x2
+        x1 = self.up1(x2, t, v) + x1
+        x0 = self.up2(x1, t, v) + x0
+        return {w: x0, w//2: x1, w//4: x2, w//8: x3}

ldm/models/diffusion/sync_dreamer_utils.py

@@ -0,0 +1,103 @@
+import torch
+from kornia import create_meshgrid
+
+
+def project_and_normalize(ref_grid, src_proj, length):
+    """
+
+    @param ref_grid: b 3 n
+    @param src_proj: b 4 4
+    @param length:   int
+    @return:  b, n, 2
+    """
+    src_grid = src_proj[:, :3, :3] @ ref_grid + src_proj[:, :3, 3:] # b 3 n
+    div_val = src_grid[:, -1:]
+    div_val[div_val<1e-4] = 1e-4
+    src_grid = src_grid[:, :2] / div_val # divide by depth (b, 2, n)
+    src_grid[:, 0] = src_grid[:, 0]/((length - 1) / 2) - 1 # scale to -1~1
+    src_grid[:, 1] = src_grid[:, 1]/((length - 1) / 2) - 1 # scale to -1~1
+    src_grid = src_grid.permute(0, 2, 1) # (b, n, 2)
+    return src_grid
+
+
+def construct_project_matrix(x_ratio, y_ratio, Ks, poses):
+    """
+    @param x_ratio: float
+    @param y_ratio: float
+    @param Ks:      b,3,3
+    @param poses:   b,3,4
+    @return:
+    """
+    rfn = Ks.shape[0]
+    scale_m = torch.tensor([x_ratio, y_ratio, 1.0], dtype=torch.float32, device=Ks.device)
+    scale_m = torch.diag(scale_m)
+    ref_prj = scale_m[None, :, :] @ Ks @ poses  # rfn,3,4
+    pad_vals = torch.zeros([rfn, 1, 4], dtype=torch.float32, device=ref_prj.device)
+    pad_vals[:, :, 3] = 1.0
+    ref_prj = torch.cat([ref_prj, pad_vals], 1)  # rfn,4,4
+    return ref_prj
+
+def get_warp_coordinates(volume_xyz, warp_size, input_size, Ks, warp_pose):
+    B, _, D, H, W = volume_xyz.shape
+    ratio = warp_size / input_size
+    warp_proj = construct_project_matrix(ratio, ratio, Ks, warp_pose) # B,4,4
+    warp_coords = project_and_normalize(volume_xyz.view(B,3,D*H*W), warp_proj, warp_size).view(B, D, H, W, 2)
+    return warp_coords
+
+
+def create_target_volume(depth_size, volume_size, input_image_size, pose_target, K, near=None, far=None):
+    device, dtype = pose_target.device, pose_target.dtype
+
+    # compute a depth range on the unit sphere
+    H, W, D, B = volume_size, volume_size, depth_size, pose_target.shape[0]
+    if near is not None and far is not None :
+        # near, far b,1,h,w
+        depth_values = torch.linspace(0, 1, steps=depth_size).to(near.device).to(near.dtype) # d
+        depth_values = depth_values.view(1, D, 1, 1) # 1,d,1,1
+        depth_values = depth_values * (far - near) + near # b d h w
+        depth_values = depth_values.view(B, 1, D, H * W)
+    else:
+        near, far = near_far_from_unit_sphere_using_camera_poses(pose_target) # b 1
+        depth_values = torch.linspace(0, 1, steps=depth_size).to(near.device).to(near.dtype) # d
+        depth_values = depth_values[None,:,None] * (far[:,None,:] - near[:,None,:]) + near[:,None,:] # b d 1
+        depth_values = depth_values.view(B, 1, D, 1).expand(B, 1, D, H*W)
+
+    ratio = volume_size / input_image_size
+
+    # creat a grid on the target (reference) view
+    # H, W, D, B = volume_size, volume_size, depth_values.shape[1], depth_values.shape[0]
+
+    # creat mesh grid: note reference also means target
+    ref_grid = create_meshgrid(H, W, normalized_coordinates=False)  # (1, H, W, 2)
+    ref_grid = ref_grid.to(device).to(dtype)
+    ref_grid = ref_grid.permute(0, 3, 1, 2) # (1, 2, H, W)
+    ref_grid = ref_grid.reshape(1, 2, H*W) # (1, 2, H*W)
+    ref_grid = ref_grid.expand(B, -1, -1) # (B, 2, H*W)
+    ref_grid = torch.cat((ref_grid, torch.ones(B, 1, H*W, dtype=ref_grid.dtype, device=ref_grid.device)), dim=1) # (B, 3, H*W)
+    ref_grid = ref_grid.unsqueeze(2) * depth_values  # (B, 3, D, H*W)
+
+    # unproject to space and transfer to world coordinates.
+    Ks = K
+    ref_proj = construct_project_matrix(ratio, ratio, Ks, pose_target) # B,4,4
+    ref_proj_inv = torch.inverse(ref_proj) # B,4,4
+    ref_grid = ref_proj_inv[:,:3,:3] @ ref_grid.view(B,3,D*H*W) + ref_proj_inv[:,:3,3:] # B,3,3 @ B,3,DHW + B,3,1 => B,3,DHW
+    return ref_grid.reshape(B,3,D,H,W), depth_values.view(B,1,D,H,W)
+
+def near_far_from_unit_sphere_using_camera_poses(camera_poses):
+    """
+    @param camera_poses: b 3 4
+    @return:
+        near: b,1
+        far: b,1
+    """
+    R_w2c = camera_poses[..., :3, :3] # b 3 3
+    t_w2c = camera_poses[..., :3, 3:] # b 3 1
+    camera_origin = -R_w2c.permute(0,2,1) @ t_w2c   # b 3 1
+    # R_w2c.T @ (0,0,1) = z_dir
+    camera_orient = R_w2c.permute(0,2,1)[...,:3,2:3] # b 3 1
+    camera_origin, camera_orient = camera_origin[...,0], camera_orient[..., 0] # b 3
+    a = torch.sum(camera_orient ** 2, dim=-1, keepdim=True) # b 1
+    b = -torch.sum(camera_orient * camera_origin, dim=-1, keepdim=True) # b 1
+    mid = b / a # b 1
+    near, far = mid - 1.0, mid + 1.0
+    return near, far

ldm/modules/attention.py

@@ -0,0 +1,336 @@
+from inspect import isfunction
+import math
+import torch
+import torch.nn.functional as F
+from torch import nn, einsum
+from einops import rearrange, repeat
+
+from ldm.modules.diffusionmodules.util import checkpoint
+
+
+def exists(val):
+    return val is not None
+
+
+def uniq(arr):
+    return{el: True for el in arr}.keys()
+
+
+def default(val, d):
+    if exists(val):
+        return val
+    return d() if isfunction(d) else d
+
+
+def max_neg_value(t):
+    return -torch.finfo(t.dtype).max
+
+
+def init_(tensor):
+    dim = tensor.shape[-1]
+    std = 1 / math.sqrt(dim)
+    tensor.uniform_(-std, std)
+    return tensor
+
+
+# feedforward
+class GEGLU(nn.Module):
+    def __init__(self, dim_in, dim_out):
+        super().__init__()
+        self.proj = nn.Linear(dim_in, dim_out * 2)
+
+    def forward(self, x):
+        x, gate = self.proj(x).chunk(2, dim=-1)
+        return x * F.gelu(gate)
+# feedforward
+class ConvGEGLU(nn.Module):
+    def __init__(self, dim_in, dim_out):
+        super().__init__()
+        self.proj = nn.Conv2d(dim_in, dim_out * 2, 1, 1, 0)
+
+    def forward(self, x):
+        x, gate = self.proj(x).chunk(2, dim=1)
+        return x * F.gelu(gate)
+
+
+class FeedForward(nn.Module):
+    def __init__(self, dim, dim_out=None, mult=4, glu=False, dropout=0.):
+        super().__init__()
+        inner_dim = int(dim * mult)
+        dim_out = default(dim_out, dim)
+        project_in = nn.Sequential(
+            nn.Linear(dim, inner_dim),
+            nn.GELU()
+        ) if not glu else GEGLU(dim, inner_dim)
+
+        self.net = nn.Sequential(
+            project_in,
+            nn.Dropout(dropout),
+            nn.Linear(inner_dim, dim_out)
+        )
+
+    def forward(self, x):
+        return self.net(x)
+
+
+def zero_module(module):
+    """
+    Zero out the parameters of a module and return it.
+    """
+    for p in module.parameters():
+        p.detach().zero_()
+    return module
+
+
+def Normalize(in_channels):
+    return torch.nn.GroupNorm(num_groups=32, num_channels=in_channels, eps=1e-6, affine=True)
+
+
+class LinearAttention(nn.Module):
+    def __init__(self, dim, heads=4, dim_head=32):
+        super().__init__()
+        self.heads = heads
+        hidden_dim = dim_head * heads
+        self.to_qkv = nn.Conv2d(dim, hidden_dim * 3, 1, bias = False)
+        self.to_out = nn.Conv2d(hidden_dim, dim, 1)
+
+    def forward(self, x):
+        b, c, h, w = x.shape
+        qkv = self.to_qkv(x)
+        q, k, v = rearrange(qkv, 'b (qkv heads c) h w -> qkv b heads c (h w)', heads = self.heads, qkv=3)
+        k = k.softmax(dim=-1)  
+        context = torch.einsum('bhdn,bhen->bhde', k, v)
+        out = torch.einsum('bhde,bhdn->bhen', context, q)
+        out = rearrange(out, 'b heads c (h w) -> b (heads c) h w', heads=self.heads, h=h, w=w)
+        return self.to_out(out)
+
+
+class SpatialSelfAttention(nn.Module):
+    def __init__(self, in_channels):
+        super().__init__()
+        self.in_channels = in_channels
+
+        self.norm = Normalize(in_channels)
+        self.q = torch.nn.Conv2d(in_channels,
+                                 in_channels,
+                                 kernel_size=1,
+                                 stride=1,
+                                 padding=0)
+        self.k = torch.nn.Conv2d(in_channels,
+                                 in_channels,
+                                 kernel_size=1,
+                                 stride=1,
+                                 padding=0)
+        self.v = torch.nn.Conv2d(in_channels,
+                                 in_channels,
+                                 kernel_size=1,
+                                 stride=1,
+                                 padding=0)
+        self.proj_out = torch.nn.Conv2d(in_channels,
+                                        in_channels,
+                                        kernel_size=1,
+                                        stride=1,
+                                        padding=0)
+
+    def forward(self, x):
+        h_ = x
+        h_ = self.norm(h_)
+        q = self.q(h_)
+        k = self.k(h_)
+        v = self.v(h_)
+
+        # compute attention
+        b,c,h,w = q.shape
+        q = rearrange(q, 'b c h w -> b (h w) c')
+        k = rearrange(k, 'b c h w -> b c (h w)')
+        w_ = torch.einsum('bij,bjk->bik', q, k)
+
+        w_ = w_ * (int(c)**(-0.5))
+        w_ = torch.nn.functional.softmax(w_, dim=2)
+
+        # attend to values
+        v = rearrange(v, 'b c h w -> b c (h w)')
+        w_ = rearrange(w_, 'b i j -> b j i')
+        h_ = torch.einsum('bij,bjk->bik', v, w_)
+        h_ = rearrange(h_, 'b c (h w) -> b c h w', h=h)
+        h_ = self.proj_out(h_)
+
+        return x+h_
+
+
+class CrossAttention(nn.Module):
+    def __init__(self, query_dim, context_dim=None, heads=8, dim_head=64, dropout=0.):
+        super().__init__()
+        inner_dim = dim_head * heads
+        context_dim = default(context_dim, query_dim)
+
+        self.scale = dim_head ** -0.5
+        self.heads = heads
+
+        self.to_q = nn.Linear(query_dim, inner_dim, bias=False)
+        self.to_k = nn.Linear(context_dim, inner_dim, bias=False)
+        self.to_v = nn.Linear(context_dim, inner_dim, bias=False)
+
+        self.to_out = nn.Sequential(
+            nn.Linear(inner_dim, query_dim),
+            nn.Dropout(dropout)
+        )
+
+    def forward(self, x, context=None, mask=None):
+        h = self.heads
+
+        q = self.to_q(x)
+        context = default(context, x)
+        k = self.to_k(context)
+        v = self.to_v(context)
+
+        q, k, v = map(lambda t: rearrange(t, 'b n (h d) -> (b h) n d', h=h), (q, k, v))
+
+        sim = einsum('b i d, b j d -> b i j', q, k) * self.scale
+
+        if exists(mask):
+            mask = mask>0
+            mask = rearrange(mask, 'b ... -> b (...)')
+            max_neg_value = -torch.finfo(sim.dtype).max
+            mask = repeat(mask, 'b j -> (b h) () j', h=h)
+            sim.masked_fill_(~mask, max_neg_value)
+
+        # attention, what we cannot get enough of
+        attn = sim.softmax(dim=-1)
+
+        out = einsum('b i j, b j d -> b i d', attn, v)
+        out = rearrange(out, '(b h) n d -> b n (h d)', h=h)
+        return self.to_out(out)
+
+class BasicSpatialTransformer(nn.Module):
+    def __init__(self, dim, n_heads, d_head, context_dim=None, checkpoint=True):
+        super().__init__()
+        inner_dim = n_heads * d_head
+        self.proj_in = nn.Sequential(
+            nn.GroupNorm(8, dim),
+            nn.Conv2d(dim, inner_dim, kernel_size=1, stride=1, padding=0),
+            nn.GroupNorm(8, inner_dim),
+            nn.ReLU(True),
+        )
+        self.attn = CrossAttention(query_dim=inner_dim, heads=n_heads, dim_head=d_head, context_dim=context_dim)  # is a self-attention if not self.disable_self_attn
+        self.out_conv = nn.Sequential(
+            nn.GroupNorm(8, inner_dim),
+            nn.ReLU(True),
+            nn.Conv2d(inner_dim, inner_dim, 1, 1),
+        )
+        self.proj_out = nn.Sequential(
+            nn.GroupNorm(8, inner_dim),
+            nn.ReLU(True),
+            zero_module(nn.Conv2d(inner_dim, dim, kernel_size=1, stride=1, padding=0)),
+        )
+        self.checkpoint = checkpoint
+
+    def forward(self, x, context=None):
+        return checkpoint(self._forward, (x, context), self.parameters(), self.checkpoint)
+
+    def _forward(self, x, context):
+        # input
+        b,_,h,w = x.shape
+        x_in = x
+        x = self.proj_in(x)
+
+        # attention
+        x = rearrange(x, 'b c h w -> b (h w) c').contiguous()
+        context = rearrange(context, 'b c h w -> b (h w) c').contiguous()
+        x = self.attn(x, context) + x
+        x = rearrange(x, 'b (h w) c -> b c h w', h=h, w=w).contiguous()
+
+        # output
+        x = self.out_conv(x) + x
+        x = self.proj_out(x) + x_in
+        return x
+
+class BasicTransformerBlock(nn.Module):
+    def __init__(self, dim, n_heads, d_head, dropout=0., context_dim=None, gated_ff=True, checkpoint=True, disable_self_attn=False):
+        super().__init__()
+        self.disable_self_attn = disable_self_attn
+        self.attn1 = CrossAttention(query_dim=dim, heads=n_heads, dim_head=d_head, dropout=dropout,
+                                    context_dim=context_dim if self.disable_self_attn else None)  # is a self-attention if not self.disable_self_attn
+        self.ff = FeedForward(dim, dropout=dropout, glu=gated_ff)
+        self.attn2 = CrossAttention(query_dim=dim, context_dim=context_dim,
+                                    heads=n_heads, dim_head=d_head, dropout=dropout)  # is self-attn if context is none
+        self.norm1 = nn.LayerNorm(dim)
+        self.norm2 = nn.LayerNorm(dim)
+        self.norm3 = nn.LayerNorm(dim)
+        self.checkpoint = checkpoint
+
+    def forward(self, x, context=None):
+        return checkpoint(self._forward, (x, context), self.parameters(), self.checkpoint)
+
+    def _forward(self, x, context=None):
+        x = self.attn1(self.norm1(x), context=context if self.disable_self_attn else None) + x
+        x = self.attn2(self.norm2(x), context=context) + x
+        x = self.ff(self.norm3(x)) + x
+        return x
+
+class ConvFeedForward(nn.Module):
+    def __init__(self, dim, dim_out=None, mult=4, glu=False, dropout=0.):
+        super().__init__()
+        inner_dim = int(dim * mult)
+        dim_out = default(dim_out, dim)
+        project_in = nn.Sequential(
+            nn.Conv2d(dim, inner_dim, 1, 1, 0),
+            nn.GELU()
+        ) if not glu else ConvGEGLU(dim, inner_dim)
+
+        self.net = nn.Sequential(
+            project_in,
+            nn.Dropout(dropout),
+            nn.Conv2d(inner_dim, dim_out, 1, 1, 0)
+        )
+
+    def forward(self, x):
+        return self.net(x)
+
+
+class SpatialTransformer(nn.Module):
+    """
+    Transformer block for image-like data.
+    First, project the input (aka embedding)
+    and reshape to b, t, d.
+    Then apply standard transformer action.
+    Finally, reshape to image
+    """
+    def __init__(self, in_channels, n_heads, d_head,
+                 depth=1, dropout=0., context_dim=None,
+                 disable_self_attn=False):
+        super().__init__()
+        self.in_channels = in_channels
+        inner_dim = n_heads * d_head
+        self.norm = Normalize(in_channels)
+
+        self.proj_in = nn.Conv2d(in_channels,
+                                 inner_dim,
+                                 kernel_size=1,
+                                 stride=1,
+                                 padding=0)
+
+        self.transformer_blocks = nn.ModuleList(
+            [BasicTransformerBlock(inner_dim, n_heads, d_head, dropout=dropout, context_dim=context_dim,
+                                   disable_self_attn=disable_self_attn)
+                for d in range(depth)]
+        )
+
+        self.proj_out = zero_module(nn.Conv2d(inner_dim,
+                                              in_channels,
+                                              kernel_size=1,
+                                              stride=1,
+                                              padding=0))
+
+    def forward(self, x, context=None):
+        # note: if no context is given, cross-attention defaults to self-attention
+        b, c, h, w = x.shape
+        x_in = x
+        x = self.norm(x)
+        x = self.proj_in(x)
+        x = rearrange(x, 'b c h w -> b (h w) c').contiguous()
+        for block in self.transformer_blocks:
+            x = block(x, context=context)
+        x = rearrange(x, 'b (h w) c -> b c h w', h=h, w=w).contiguous()
+        x = self.proj_out(x)
+        return x + x_in

ldm/modules/diffusionmodules/model.py

@@ -0,0 +1,835 @@
+# pytorch_diffusion + derived encoder decoder
+import math
+import torch
+import torch.nn as nn
+import numpy as np
+from einops import rearrange
+
+from ldm.util import instantiate_from_config
+from ldm.modules.attention import LinearAttention
+
+
+def get_timestep_embedding(timesteps, embedding_dim):
+    """
+    This matches the implementation in Denoising Diffusion Probabilistic Models:
+    From Fairseq.
+    Build sinusoidal embeddings.
+    This matches the implementation in tensor2tensor, but differs slightly
+    from the description in Section 3.5 of "Attention Is All You Need".
+    """
+    assert len(timesteps.shape) == 1
+
+    half_dim = embedding_dim // 2
+    emb = math.log(10000) / (half_dim - 1)
+    emb = torch.exp(torch.arange(half_dim, dtype=torch.float32) * -emb)
+    emb = emb.to(device=timesteps.device)
+    emb = timesteps.float()[:, None] * emb[None, :]
+    emb = torch.cat([torch.sin(emb), torch.cos(emb)], dim=1)
+    if embedding_dim % 2 == 1:  # zero pad
+        emb = torch.nn.functional.pad(emb, (0,1,0,0))
+    return emb
+
+
+def nonlinearity(x):
+    # swish
+    return x*torch.sigmoid(x)
+
+
+def Normalize(in_channels, num_groups=32):
+    return torch.nn.GroupNorm(num_groups=num_groups, num_channels=in_channels, eps=1e-6, affine=True)
+
+
+class Upsample(nn.Module):
+    def __init__(self, in_channels, with_conv):
+        super().__init__()
+        self.with_conv = with_conv
+        if self.with_conv:
+            self.conv = torch.nn.Conv2d(in_channels,
+                                        in_channels,
+                                        kernel_size=3,
+                                        stride=1,
+                                        padding=1)
+
+    def forward(self, x):
+        x = torch.nn.functional.interpolate(x, scale_factor=2.0, mode="nearest")
+        if self.with_conv:
+            x = self.conv(x)
+        return x
+
+
+class Downsample(nn.Module):
+    def __init__(self, in_channels, with_conv):
+        super().__init__()
+        self.with_conv = with_conv
+        if self.with_conv:
+            # no asymmetric padding in torch conv, must do it ourselves
+            self.conv = torch.nn.Conv2d(in_channels,
+                                        in_channels,
+                                        kernel_size=3,
+                                        stride=2,
+                                        padding=0)
+
+    def forward(self, x):
+        if self.with_conv:
+            pad = (0,1,0,1)
+            x = torch.nn.functional.pad(x, pad, mode="constant", value=0)
+            x = self.conv(x)
+        else:
+            x = torch.nn.functional.avg_pool2d(x, kernel_size=2, stride=2)
+        return x
+
+
+class ResnetBlock(nn.Module):
+    def __init__(self, *, in_channels, out_channels=None, conv_shortcut=False,
+                 dropout, temb_channels=512):
+        super().__init__()
+        self.in_channels = in_channels
+        out_channels = in_channels if out_channels is None else out_channels
+        self.out_channels = out_channels
+        self.use_conv_shortcut = conv_shortcut
+
+        self.norm1 = Normalize(in_channels)
+        self.conv1 = torch.nn.Conv2d(in_channels,
+                                     out_channels,
+                                     kernel_size=3,
+                                     stride=1,
+                                     padding=1)
+        if temb_channels > 0:
+            self.temb_proj = torch.nn.Linear(temb_channels,
+                                             out_channels)
+        self.norm2 = Normalize(out_channels)
+        self.dropout = torch.nn.Dropout(dropout)
+        self.conv2 = torch.nn.Conv2d(out_channels,
+                                     out_channels,
+                                     kernel_size=3,
+                                     stride=1,
+                                     padding=1)
+        if self.in_channels != self.out_channels:
+            if self.use_conv_shortcut:
+                self.conv_shortcut = torch.nn.Conv2d(in_channels,
+                                                     out_channels,
+                                                     kernel_size=3,
+                                                     stride=1,
+                                                     padding=1)
+            else:
+                self.nin_shortcut = torch.nn.Conv2d(in_channels,
+                                                    out_channels,
+                                                    kernel_size=1,
+                                                    stride=1,
+                                                    padding=0)
+
+    def forward(self, x, temb):
+        h = x
+        h = self.norm1(h)
+        h = nonlinearity(h)
+        h = self.conv1(h)
+
+        if temb is not None:
+            h = h + self.temb_proj(nonlinearity(temb))[:,:,None,None]
+
+        h = self.norm2(h)
+        h = nonlinearity(h)
+        h = self.dropout(h)
+        h = self.conv2(h)
+
+        if self.in_channels != self.out_channels:
+            if self.use_conv_shortcut:
+                x = self.conv_shortcut(x)
+            else:
+                x = self.nin_shortcut(x)
+
+        return x+h
+
+
+class LinAttnBlock(LinearAttention):
+    """to match AttnBlock usage"""
+    def __init__(self, in_channels):
+        super().__init__(dim=in_channels, heads=1, dim_head=in_channels)
+
+
+class AttnBlock(nn.Module):
+    def __init__(self, in_channels):
+        super().__init__()
+        self.in_channels = in_channels
+
+        self.norm = Normalize(in_channels)
+        self.q = torch.nn.Conv2d(in_channels,
+                                 in_channels,
+                                 kernel_size=1,
+                                 stride=1,
+                                 padding=0)
+        self.k = torch.nn.Conv2d(in_channels,
+                                 in_channels,
+                                 kernel_size=1,
+                                 stride=1,
+                                 padding=0)
+        self.v = torch.nn.Conv2d(in_channels,
+                                 in_channels,
+                                 kernel_size=1,
+                                 stride=1,
+                                 padding=0)
+        self.proj_out = torch.nn.Conv2d(in_channels,
+                                        in_channels,
+                                        kernel_size=1,
+                                        stride=1,
+                                        padding=0)
+
+
+    def forward(self, x):
+        h_ = x
+        h_ = self.norm(h_)
+        q = self.q(h_)
+        k = self.k(h_)
+        v = self.v(h_)
+
+        # compute attention
+        b,c,h,w = q.shape
+        q = q.reshape(b,c,h*w)
+        q = q.permute(0,2,1)   # b,hw,c
+        k = k.reshape(b,c,h*w) # b,c,hw
+        w_ = torch.bmm(q,k)     # b,hw,hw    w[b,i,j]=sum_c q[b,i,c]k[b,c,j]
+        w_ = w_ * (int(c)**(-0.5))
+        w_ = torch.nn.functional.softmax(w_, dim=2)
+
+        # attend to values
+        v = v.reshape(b,c,h*w)
+        w_ = w_.permute(0,2,1)   # b,hw,hw (first hw of k, second of q)
+        h_ = torch.bmm(v,w_)     # b, c,hw (hw of q) h_[b,c,j] = sum_i v[b,c,i] w_[b,i,j]
+        h_ = h_.reshape(b,c,h,w)
+
+        h_ = self.proj_out(h_)
+
+        return x+h_
+
+
+def make_attn(in_channels, attn_type="vanilla"):
+    assert attn_type in ["vanilla", "linear", "none"], f'attn_type {attn_type} unknown'
+    print(f"making attention of type '{attn_type}' with {in_channels} in_channels")
+    if attn_type == "vanilla":
+        return AttnBlock(in_channels)
+    elif attn_type == "none":
+        return nn.Identity(in_channels)
+    else:
+        return LinAttnBlock(in_channels)
+
+
+class Model(nn.Module):
+    def __init__(self, *, ch, out_ch, ch_mult=(1,2,4,8), num_res_blocks,
+                 attn_resolutions, dropout=0.0, resamp_with_conv=True, in_channels,
+                 resolution, use_timestep=True, use_linear_attn=False, attn_type="vanilla"):
+        super().__init__()
+        if use_linear_attn: attn_type = "linear"
+        self.ch = ch
+        self.temb_ch = self.ch*4
+        self.num_resolutions = len(ch_mult)
+        self.num_res_blocks = num_res_blocks
+        self.resolution = resolution
+        self.in_channels = in_channels
+
+        self.use_timestep = use_timestep
+        if self.use_timestep:
+            # timestep embedding
+            self.temb = nn.Module()
+            self.temb.dense = nn.ModuleList([
+                torch.nn.Linear(self.ch,
+                                self.temb_ch),
+                torch.nn.Linear(self.temb_ch,
+                                self.temb_ch),
+            ])
+
+        # downsampling
+        self.conv_in = torch.nn.Conv2d(in_channels,
+                                       self.ch,
+                                       kernel_size=3,
+                                       stride=1,
+                                       padding=1)
+
+        curr_res = resolution
+        in_ch_mult = (1,)+tuple(ch_mult)
+        self.down = nn.ModuleList()
+        for i_level in range(self.num_resolutions):
+            block = nn.ModuleList()
+            attn = nn.ModuleList()
+            block_in = ch*in_ch_mult[i_level]
+            block_out = ch*ch_mult[i_level]
+            for i_block in range(self.num_res_blocks):
+                block.append(ResnetBlock(in_channels=block_in,
+                                         out_channels=block_out,
+                                         temb_channels=self.temb_ch,
+                                         dropout=dropout))
+                block_in = block_out
+                if curr_res in attn_resolutions:
+                    attn.append(make_attn(block_in, attn_type=attn_type))
+            down = nn.Module()
+            down.block = block
+            down.attn = attn
+            if i_level != self.num_resolutions-1:
+                down.downsample = Downsample(block_in, resamp_with_conv)
+                curr_res = curr_res // 2
+            self.down.append(down)
+
+        # middle
+        self.mid = nn.Module()
+        self.mid.block_1 = ResnetBlock(in_channels=block_in,
+                                       out_channels=block_in,
+                                       temb_channels=self.temb_ch,
+                                       dropout=dropout)
+        self.mid.attn_1 = make_attn(block_in, attn_type=attn_type)
+        self.mid.block_2 = ResnetBlock(in_channels=block_in,
+                                       out_channels=block_in,
+                                       temb_channels=self.temb_ch,
+                                       dropout=dropout)
+
+        # upsampling
+        self.up = nn.ModuleList()
+        for i_level in reversed(range(self.num_resolutions)):
+            block = nn.ModuleList()
+            attn = nn.ModuleList()
+            block_out = ch*ch_mult[i_level]
+            skip_in = ch*ch_mult[i_level]
+            for i_block in range(self.num_res_blocks+1):
+                if i_block == self.num_res_blocks:
+                    skip_in = ch*in_ch_mult[i_level]
+                block.append(ResnetBlock(in_channels=block_in+skip_in,
+                                         out_channels=block_out,
+                                         temb_channels=self.temb_ch,
+                                         dropout=dropout))
+                block_in = block_out
+                if curr_res in attn_resolutions:
+                    attn.append(make_attn(block_in, attn_type=attn_type))
+            up = nn.Module()
+            up.block = block
+            up.attn = attn
+            if i_level != 0:
+                up.upsample = Upsample(block_in, resamp_with_conv)
+                curr_res = curr_res * 2
+            self.up.insert(0, up) # prepend to get consistent order
+
+        # end
+        self.norm_out = Normalize(block_in)
+        self.conv_out = torch.nn.Conv2d(block_in,
+                                        out_ch,
+                                        kernel_size=3,
+                                        stride=1,
+                                        padding=1)
+
+    def forward(self, x, t=None, context=None):
+        #assert x.shape[2] == x.shape[3] == self.resolution
+        if context is not None:
+            # assume aligned context, cat along channel axis
+            x = torch.cat((x, context), dim=1)
+        if self.use_timestep:
+            # timestep embedding
+            assert t is not None
+            temb = get_timestep_embedding(t, self.ch)
+            temb = self.temb.dense[0](temb)
+            temb = nonlinearity(temb)
+            temb = self.temb.dense[1](temb)
+        else:
+            temb = None
+
+        # downsampling
+        hs = [self.conv_in(x)]
+        for i_level in range(self.num_resolutions):
+            for i_block in range(self.num_res_blocks):
+                h = self.down[i_level].block[i_block](hs[-1], temb)
+                if len(self.down[i_level].attn) > 0:
+                    h = self.down[i_level].attn[i_block](h)
+                hs.append(h)
+            if i_level != self.num_resolutions-1:
+                hs.append(self.down[i_level].downsample(hs[-1]))
+
+        # middle
+        h = hs[-1]
+        h = self.mid.block_1(h, temb)
+        h = self.mid.attn_1(h)
+        h = self.mid.block_2(h, temb)
+
+        # upsampling
+        for i_level in reversed(range(self.num_resolutions)):
+            for i_block in range(self.num_res_blocks+1):
+                h = self.up[i_level].block[i_block](
+                    torch.cat([h, hs.pop()], dim=1), temb)
+                if len(self.up[i_level].attn) > 0:
+                    h = self.up[i_level].attn[i_block](h)
+            if i_level != 0:
+                h = self.up[i_level].upsample(h)
+
+        # end
+        h = self.norm_out(h)
+        h = nonlinearity(h)
+        h = self.conv_out(h)
+        return h
+
+    def get_last_layer(self):
+        return self.conv_out.weight
+
+
+class Encoder(nn.Module):
+    def __init__(self, *, ch, out_ch, ch_mult=(1,2,4,8), num_res_blocks,
+                 attn_resolutions, dropout=0.0, resamp_with_conv=True, in_channels,
+                 resolution, z_channels, double_z=True, use_linear_attn=False, attn_type="vanilla",
+                 **ignore_kwargs):
+        super().__init__()
+        if use_linear_attn: attn_type = "linear"
+        self.ch = ch
+        self.temb_ch = 0
+        self.num_resolutions = len(ch_mult)
+        self.num_res_blocks = num_res_blocks
+        self.resolution = resolution
+        self.in_channels = in_channels
+
+        # downsampling
+        self.conv_in = torch.nn.Conv2d(in_channels,
+                                       self.ch,
+                                       kernel_size=3,
+                                       stride=1,
+                                       padding=1)
+
+        curr_res = resolution
+        in_ch_mult = (1,)+tuple(ch_mult)
+        self.in_ch_mult = in_ch_mult
+        self.down = nn.ModuleList()
+        for i_level in range(self.num_resolutions):
+            block = nn.ModuleList()
+            attn = nn.ModuleList()
+            block_in = ch*in_ch_mult[i_level]
+            block_out = ch*ch_mult[i_level]
+            for i_block in range(self.num_res_blocks):
+                block.append(ResnetBlock(in_channels=block_in,
+                                         out_channels=block_out,
+                                         temb_channels=self.temb_ch,
+                                         dropout=dropout))
+                block_in = block_out
+                if curr_res in attn_resolutions:
+                    attn.append(make_attn(block_in, attn_type=attn_type))
+            down = nn.Module()
+            down.block = block
+            down.attn = attn
+            if i_level != self.num_resolutions-1:
+                down.downsample = Downsample(block_in, resamp_with_conv)
+                curr_res = curr_res // 2
+            self.down.append(down)
+
+        # middle
+        self.mid = nn.Module()
+        self.mid.block_1 = ResnetBlock(in_channels=block_in,
+                                       out_channels=block_in,
+                                       temb_channels=self.temb_ch,
+                                       dropout=dropout)
+        self.mid.attn_1 = make_attn(block_in, attn_type=attn_type)
+        self.mid.block_2 = ResnetBlock(in_channels=block_in,
+                                       out_channels=block_in,
+                                       temb_channels=self.temb_ch,
+                                       dropout=dropout)
+
+        # end
+        self.norm_out = Normalize(block_in)
+        self.conv_out = torch.nn.Conv2d(block_in,
+                                        2*z_channels if double_z else z_channels,
+                                        kernel_size=3,
+                                        stride=1,
+                                        padding=1)
+
+    def forward(self, x):
+        # timestep embedding
+        temb = None
+
+        # downsampling
+        hs = [self.conv_in(x)]
+        for i_level in range(self.num_resolutions):
+            for i_block in range(self.num_res_blocks):
+                h = self.down[i_level].block[i_block](hs[-1], temb)
+                if len(self.down[i_level].attn) > 0:
+                    h = self.down[i_level].attn[i_block](h)
+                hs.append(h)
+            if i_level != self.num_resolutions-1:
+                hs.append(self.down[i_level].downsample(hs[-1]))
+
+        # middle
+        h = hs[-1]
+        h = self.mid.block_1(h, temb)
+        h = self.mid.attn_1(h)
+        h = self.mid.block_2(h, temb)
+
+        # end
+        h = self.norm_out(h)
+        h = nonlinearity(h)
+        h = self.conv_out(h)
+        return h
+
+
+class Decoder(nn.Module):
+    def __init__(self, *, ch, out_ch, ch_mult=(1,2,4,8), num_res_blocks,
+                 attn_resolutions, dropout=0.0, resamp_with_conv=True, in_channels,
+                 resolution, z_channels, give_pre_end=False, tanh_out=False, use_linear_attn=False,
+                 attn_type="vanilla", **ignorekwargs):
+        super().__init__()
+        if use_linear_attn: attn_type = "linear"
+        self.ch = ch
+        self.temb_ch = 0
+        self.num_resolutions = len(ch_mult)
+        self.num_res_blocks = num_res_blocks
+        self.resolution = resolution
+        self.in_channels = in_channels
+        self.give_pre_end = give_pre_end
+        self.tanh_out = tanh_out
+
+        # compute in_ch_mult, block_in and curr_res at lowest res
+        in_ch_mult = (1,)+tuple(ch_mult)
+        block_in = ch*ch_mult[self.num_resolutions-1]
+        curr_res = resolution // 2**(self.num_resolutions-1)
+        self.z_shape = (1,z_channels,curr_res,curr_res)
+        print("Working with z of shape {} = {} dimensions.".format(
+            self.z_shape, np.prod(self.z_shape)))
+
+        # z to block_in
+        self.conv_in = torch.nn.Conv2d(z_channels,
+                                       block_in,
+                                       kernel_size=3,
+                                       stride=1,
+                                       padding=1)
+
+        # middle
+        self.mid = nn.Module()
+        self.mid.block_1 = ResnetBlock(in_channels=block_in,
+                                       out_channels=block_in,
+                                       temb_channels=self.temb_ch,
+                                       dropout=dropout)
+        self.mid.attn_1 = make_attn(block_in, attn_type=attn_type)
+        self.mid.block_2 = ResnetBlock(in_channels=block_in,
+                                       out_channels=block_in,
+                                       temb_channels=self.temb_ch,
+                                       dropout=dropout)
+
+        # upsampling
+        self.up = nn.ModuleList()
+        for i_level in reversed(range(self.num_resolutions)):
+            block = nn.ModuleList()
+            attn = nn.ModuleList()
+            block_out = ch*ch_mult[i_level]
+            for i_block in range(self.num_res_blocks+1):
+                block.append(ResnetBlock(in_channels=block_in,
+                                         out_channels=block_out,
+                                         temb_channels=self.temb_ch,
+                                         dropout=dropout))
+                block_in = block_out
+                if curr_res in attn_resolutions:
+                    attn.append(make_attn(block_in, attn_type=attn_type))
+            up = nn.Module()
+            up.block = block
+            up.attn = attn
+            if i_level != 0:
+                up.upsample = Upsample(block_in, resamp_with_conv)
+                curr_res = curr_res * 2
+            self.up.insert(0, up) # prepend to get consistent order
+
+        # end
+        self.norm_out = Normalize(block_in)
+        self.conv_out = torch.nn.Conv2d(block_in,
+                                        out_ch,
+                                        kernel_size=3,
+                                        stride=1,
+                                        padding=1)
+
+    def forward(self, z):
+        #assert z.shape[1:] == self.z_shape[1:]
+        self.last_z_shape = z.shape
+
+        # timestep embedding
+        temb = None
+
+        # z to block_in
+        h = self.conv_in(z)
+
+        # middle
+        h = self.mid.block_1(h, temb)
+        h = self.mid.attn_1(h)
+        h = self.mid.block_2(h, temb)
+
+        # upsampling
+        for i_level in reversed(range(self.num_resolutions)):
+            for i_block in range(self.num_res_blocks+1):
+                h = self.up[i_level].block[i_block](h, temb)
+                if len(self.up[i_level].attn) > 0:
+                    h = self.up[i_level].attn[i_block](h)
+            if i_level != 0:
+                h = self.up[i_level].upsample(h)
+
+        # end
+        if self.give_pre_end:
+            return h
+
+        h = self.norm_out(h)
+        h = nonlinearity(h)
+        h = self.conv_out(h)
+        if self.tanh_out:
+            h = torch.tanh(h)
+        return h
+
+
+class SimpleDecoder(nn.Module):
+    def __init__(self, in_channels, out_channels, *args, **kwargs):
+        super().__init__()
+        self.model = nn.ModuleList([nn.Conv2d(in_channels, in_channels, 1),
+                                     ResnetBlock(in_channels=in_channels,
+                                                 out_channels=2 * in_channels,
+                                                 temb_channels=0, dropout=0.0),
+                                     ResnetBlock(in_channels=2 * in_channels,
+                                                out_channels=4 * in_channels,
+                                                temb_channels=0, dropout=0.0),
+                                     ResnetBlock(in_channels=4 * in_channels,
+                                                out_channels=2 * in_channels,
+                                                temb_channels=0, dropout=0.0),
+                                     nn.Conv2d(2*in_channels, in_channels, 1),
+                                     Upsample(in_channels, with_conv=True)])
+        # end
+        self.norm_out = Normalize(in_channels)
+        self.conv_out = torch.nn.Conv2d(in_channels,
+                                        out_channels,
+                                        kernel_size=3,
+                                        stride=1,
+                                        padding=1)
+
+    def forward(self, x):
+        for i, layer in enumerate(self.model):
+            if i in [1,2,3]:
+                x = layer(x, None)
+            else:
+                x = layer(x)
+
+        h = self.norm_out(x)
+        h = nonlinearity(h)
+        x = self.conv_out(h)
+        return x
+
+
+class UpsampleDecoder(nn.Module):
+    def __init__(self, in_channels, out_channels, ch, num_res_blocks, resolution,
+                 ch_mult=(2,2), dropout=0.0):
+        super().__init__()
+        # upsampling
+        self.temb_ch = 0
+        self.num_resolutions = len(ch_mult)
+        self.num_res_blocks = num_res_blocks
+        block_in = in_channels
+        curr_res = resolution // 2 ** (self.num_resolutions - 1)
+        self.res_blocks = nn.ModuleList()
+        self.upsample_blocks = nn.ModuleList()
+        for i_level in range(self.num_resolutions):
+            res_block = []
+            block_out = ch * ch_mult[i_level]
+            for i_block in range(self.num_res_blocks + 1):
+                res_block.append(ResnetBlock(in_channels=block_in,
+                                         out_channels=block_out,
+                                         temb_channels=self.temb_ch,
+                                         dropout=dropout))
+                block_in = block_out
+            self.res_blocks.append(nn.ModuleList(res_block))
+            if i_level != self.num_resolutions - 1:
+                self.upsample_blocks.append(Upsample(block_in, True))
+                curr_res = curr_res * 2
+
+        # end
+        self.norm_out = Normalize(block_in)
+        self.conv_out = torch.nn.Conv2d(block_in,
+                                        out_channels,
+                                        kernel_size=3,
+                                        stride=1,
+                                        padding=1)
+
+    def forward(self, x):
+        # upsampling
+        h = x
+        for k, i_level in enumerate(range(self.num_resolutions)):
+            for i_block in range(self.num_res_blocks + 1):
+                h = self.res_blocks[i_level][i_block](h, None)
+            if i_level != self.num_resolutions - 1:
+                h = self.upsample_blocks[k](h)
+        h = self.norm_out(h)
+        h = nonlinearity(h)
+        h = self.conv_out(h)
+        return h
+
+
+class LatentRescaler(nn.Module):
+    def __init__(self, factor, in_channels, mid_channels, out_channels, depth=2):
+        super().__init__()
+        # residual block, interpolate, residual block
+        self.factor = factor
+        self.conv_in = nn.Conv2d(in_channels,
+                                 mid_channels,
+                                 kernel_size=3,
+                                 stride=1,
+                                 padding=1)
+        self.res_block1 = nn.ModuleList([ResnetBlock(in_channels=mid_channels,
+                                                     out_channels=mid_channels,
+                                                     temb_channels=0,
+                                                     dropout=0.0) for _ in range(depth)])
+        self.attn = AttnBlock(mid_channels)
+        self.res_block2 = nn.ModuleList([ResnetBlock(in_channels=mid_channels,
+                                                     out_channels=mid_channels,
+                                                     temb_channels=0,
+                                                     dropout=0.0) for _ in range(depth)])
+
+        self.conv_out = nn.Conv2d(mid_channels,
+                                  out_channels,
+                                  kernel_size=1,
+                                  )
+
+    def forward(self, x):
+        x = self.conv_in(x)
+        for block in self.res_block1:
+            x = block(x, None)
+        x = torch.nn.functional.interpolate(x, size=(int(round(x.shape[2]*self.factor)), int(round(x.shape[3]*self.factor))))
+        x = self.attn(x)
+        for block in self.res_block2:
+            x = block(x, None)
+        x = self.conv_out(x)
+        return x
+
+
+class MergedRescaleEncoder(nn.Module):
+    def __init__(self, in_channels, ch, resolution, out_ch, num_res_blocks,
+                 attn_resolutions, dropout=0.0, resamp_with_conv=True,
+                 ch_mult=(1,2,4,8), rescale_factor=1.0, rescale_module_depth=1):
+        super().__init__()
+        intermediate_chn = ch * ch_mult[-1]
+        self.encoder = Encoder(in_channels=in_channels, num_res_blocks=num_res_blocks, ch=ch, ch_mult=ch_mult,
+                               z_channels=intermediate_chn, double_z=False, resolution=resolution,
+                               attn_resolutions=attn_resolutions, dropout=dropout, resamp_with_conv=resamp_with_conv,
+                               out_ch=None)
+        self.rescaler = LatentRescaler(factor=rescale_factor, in_channels=intermediate_chn,
+                                       mid_channels=intermediate_chn, out_channels=out_ch, depth=rescale_module_depth)
+
+    def forward(self, x):
+        x = self.encoder(x)
+        x = self.rescaler(x)
+        return x
+
+
+class MergedRescaleDecoder(nn.Module):
+    def __init__(self, z_channels, out_ch, resolution, num_res_blocks, attn_resolutions, ch, ch_mult=(1,2,4,8),
+                 dropout=0.0, resamp_with_conv=True, rescale_factor=1.0, rescale_module_depth=1):
+        super().__init__()
+        tmp_chn = z_channels*ch_mult[-1]
+        self.decoder = Decoder(out_ch=out_ch, z_channels=tmp_chn, attn_resolutions=attn_resolutions, dropout=dropout,
+                               resamp_with_conv=resamp_with_conv, in_channels=None, num_res_blocks=num_res_blocks,
+                               ch_mult=ch_mult, resolution=resolution, ch=ch)
+        self.rescaler = LatentRescaler(factor=rescale_factor, in_channels=z_channels, mid_channels=tmp_chn,
+                                       out_channels=tmp_chn, depth=rescale_module_depth)
+
+    def forward(self, x):
+        x = self.rescaler(x)
+        x = self.decoder(x)
+        return x
+
+
+class Upsampler(nn.Module):
+    def __init__(self, in_size, out_size, in_channels, out_channels, ch_mult=2):
+        super().__init__()
+        assert out_size >= in_size
+        num_blocks = int(np.log2(out_size//in_size))+1
+        factor_up = 1.+ (out_size % in_size)
+        print(f"Building {self.__class__.__name__} with in_size: {in_size} --> out_size {out_size} and factor {factor_up}")
+        self.rescaler = LatentRescaler(factor=factor_up, in_channels=in_channels, mid_channels=2*in_channels,
+                                       out_channels=in_channels)
+        self.decoder = Decoder(out_ch=out_channels, resolution=out_size, z_channels=in_channels, num_res_blocks=2,
+                               attn_resolutions=[], in_channels=None, ch=in_channels,
+                               ch_mult=[ch_mult for _ in range(num_blocks)])
+
+    def forward(self, x):
+        x = self.rescaler(x)
+        x = self.decoder(x)
+        return x
+
+
+class Resize(nn.Module):
+    def __init__(self, in_channels=None, learned=False, mode="bilinear"):
+        super().__init__()
+        self.with_conv = learned
+        self.mode = mode
+        if self.with_conv:
+            print(f"Note: {self.__class__.__name} uses learned downsampling and will ignore the fixed {mode} mode")
+            raise NotImplementedError()
+            assert in_channels is not None
+            # no asymmetric padding in torch conv, must do it ourselves
+            self.conv = torch.nn.Conv2d(in_channels,
+                                        in_channels,
+                                        kernel_size=4,
+                                        stride=2,
+                                        padding=1)
+
+    def forward(self, x, scale_factor=1.0):
+        if scale_factor==1.0:
+            return x
+        else:
+            x = torch.nn.functional.interpolate(x, mode=self.mode, align_corners=False, scale_factor=scale_factor)
+        return x
+
+class FirstStagePostProcessor(nn.Module):
+
+    def __init__(self, ch_mult:list, in_channels,
+                 pretrained_model:nn.Module=None,
+                 reshape=False,
+                 n_channels=None,
+                 dropout=0.,
+                 pretrained_config=None):
+        super().__init__()
+        if pretrained_config is None:
+            assert pretrained_model is not None, 'Either "pretrained_model" or "pretrained_config" must not be None'
+            self.pretrained_model = pretrained_model
+        else:
+            assert pretrained_config is not None, 'Either "pretrained_model" or "pretrained_config" must not be None'
+            self.instantiate_pretrained(pretrained_config)
+
+        self.do_reshape = reshape
+
+        if n_channels is None:
+            n_channels = self.pretrained_model.encoder.ch
+
+        self.proj_norm = Normalize(in_channels,num_groups=in_channels//2)
+        self.proj = nn.Conv2d(in_channels,n_channels,kernel_size=3,
+                            stride=1,padding=1)
+
+        blocks = []
+        downs = []
+        ch_in = n_channels
+        for m in ch_mult:
+            blocks.append(ResnetBlock(in_channels=ch_in,out_channels=m*n_channels,dropout=dropout))
+            ch_in = m * n_channels
+            downs.append(Downsample(ch_in, with_conv=False))
+
+        self.model = nn.ModuleList(blocks)
+        self.downsampler = nn.ModuleList(downs)
+
+
+    def instantiate_pretrained(self, config):
+        model = instantiate_from_config(config)
+        self.pretrained_model = model.eval()
+        # self.pretrained_model.train = False
+        for param in self.pretrained_model.parameters():
+            param.requires_grad = False
+
+
+    @torch.no_grad()
+    def encode_with_pretrained(self,x):
+        c = self.pretrained_model.encode(x)
+        if isinstance(c, DiagonalGaussianDistribution):
+            c = c.mode()
+        return  c
+
+    def forward(self,x):
+        z_fs = self.encode_with_pretrained(x)
+        z = self.proj_norm(z_fs)
+        z = self.proj(z)
+        z = nonlinearity(z)
+
+        for submodel, downmodel in zip(self.model,self.downsampler):
+            z = submodel(z,temb=None)
+            z = downmodel(z)
+
+        if self.do_reshape:
+            z = rearrange(z,'b c h w -> b (h w) c')
+        return z
+

ldm/modules/diffusionmodules/openaimodel.py

@@ -0,0 +1,996 @@
+from abc import abstractmethod
+from functools import partial
+import math
+from typing import Iterable
+
+import numpy as np
+import torch as th
+import torch.nn as nn
+import torch.nn.functional as F
+
+from ldm.modules.diffusionmodules.util import (
+    checkpoint,
+    conv_nd,
+    linear,
+    avg_pool_nd,
+    zero_module,
+    normalization,
+    timestep_embedding,
+)
+from ldm.modules.attention import SpatialTransformer
+from ldm.util import exists
+
+
+# dummy replace
+def convert_module_to_f16(x):
+    pass
+
+def convert_module_to_f32(x):
+    pass
+
+
+## go
+class AttentionPool2d(nn.Module):
+    """
+    Adapted from CLIP: https://github.com/openai/CLIP/blob/main/clip/model.py
+    """
+
+    def __init__(
+        self,
+        spacial_dim: int,
+        embed_dim: int,
+        num_heads_channels: int,
+        output_dim: int = None,
+    ):
+        super().__init__()
+        self.positional_embedding = nn.Parameter(th.randn(embed_dim, spacial_dim ** 2 + 1) / embed_dim ** 0.5)
+        self.qkv_proj = conv_nd(1, embed_dim, 3 * embed_dim, 1)
+        self.c_proj = conv_nd(1, embed_dim, output_dim or embed_dim, 1)
+        self.num_heads = embed_dim // num_heads_channels
+        self.attention = QKVAttention(self.num_heads)
+
+    def forward(self, x):
+        b, c, *_spatial = x.shape
+        x = x.reshape(b, c, -1)  # NC(HW)
+        x = th.cat([x.mean(dim=-1, keepdim=True), x], dim=-1)  # NC(HW+1)
+        x = x + self.positional_embedding[None, :, :].to(x.dtype)  # NC(HW+1)
+        x = self.qkv_proj(x)
+        x = self.attention(x)
+        x = self.c_proj(x)
+        return x[:, :, 0]
+
+
+class TimestepBlock(nn.Module):
+    """
+    Any module where forward() takes timestep embeddings as a second argument.
+    """
+
+    @abstractmethod
+    def forward(self, x, emb):
+        """
+        Apply the module to `x` given `emb` timestep embeddings.
+        """
+
+
+class TimestepEmbedSequential(nn.Sequential, TimestepBlock):
+    """
+    A sequential module that passes timestep embeddings to the children that
+    support it as an extra input.
+    """
+
+    def forward(self, x, emb, context=None):
+        for layer in self:
+            if isinstance(layer, TimestepBlock):
+                x = layer(x, emb)
+            elif isinstance(layer, SpatialTransformer):
+                x = layer(x, context)
+            else:
+                x = layer(x)
+        return x
+
+
+class Upsample(nn.Module):
+    """
+    An upsampling layer with an optional convolution.
+    :param channels: channels in the inputs and outputs.
+    :param use_conv: a bool determining if a convolution is applied.
+    :param dims: determines if the signal is 1D, 2D, or 3D. If 3D, then
+                 upsampling occurs in the inner-two dimensions.
+    """
+
+    def __init__(self, channels, use_conv, dims=2, out_channels=None, padding=1):
+        super().__init__()
+        self.channels = channels
+        self.out_channels = out_channels or channels
+        self.use_conv = use_conv
+        self.dims = dims
+        if use_conv:
+            self.conv = conv_nd(dims, self.channels, self.out_channels, 3, padding=padding)
+
+    def forward(self, x):
+        assert x.shape[1] == self.channels
+        if self.dims == 3:
+            x = F.interpolate(
+                x, (x.shape[2], x.shape[3] * 2, x.shape[4] * 2), mode="nearest"
+            )
+        else:
+            x = F.interpolate(x, scale_factor=2, mode="nearest")
+        if self.use_conv:
+            x = self.conv(x)
+        return x
+
+class TransposedUpsample(nn.Module):
+    'Learned 2x upsampling without padding'
+    def __init__(self, channels, out_channels=None, ks=5):
+        super().__init__()
+        self.channels = channels
+        self.out_channels = out_channels or channels
+
+        self.up = nn.ConvTranspose2d(self.channels,self.out_channels,kernel_size=ks,stride=2)
+
+    def forward(self,x):
+        return self.up(x)
+
+
+class Downsample(nn.Module):
+    """
+    A downsampling layer with an optional convolution.
+    :param channels: channels in the inputs and outputs.
+    :param use_conv: a bool determining if a convolution is applied.
+    :param dims: determines if the signal is 1D, 2D, or 3D. If 3D, then
+                 downsampling occurs in the inner-two dimensions.
+    """
+
+    def __init__(self, channels, use_conv, dims=2, out_channels=None,padding=1):
+        super().__init__()
+        self.channels = channels
+        self.out_channels = out_channels or channels
+        self.use_conv = use_conv
+        self.dims = dims
+        stride = 2 if dims != 3 else (1, 2, 2)
+        if use_conv:
+            self.op = conv_nd(
+                dims, self.channels, self.out_channels, 3, stride=stride, padding=padding
+            )
+        else:
+            assert self.channels == self.out_channels
+            self.op = avg_pool_nd(dims, kernel_size=stride, stride=stride)
+
+    def forward(self, x):
+        assert x.shape[1] == self.channels
+        return self.op(x)
+
+
+class ResBlock(TimestepBlock):
+    """
+    A residual block that can optionally change the number of channels.
+    :param channels: the number of input channels.
+    :param emb_channels: the number of timestep embedding channels.
+    :param dropout: the rate of dropout.
+    :param out_channels: if specified, the number of out channels.
+    :param use_conv: if True and out_channels is specified, use a spatial
+        convolution instead of a smaller 1x1 convolution to change the
+        channels in the skip connection.
+    :param dims: determines if the signal is 1D, 2D, or 3D.
+    :param use_checkpoint: if True, use gradient checkpointing on this module.
+    :param up: if True, use this block for upsampling.
+    :param down: if True, use this block for downsampling.
+    """
+
+    def __init__(
+        self,
+        channels,
+        emb_channels,
+        dropout,
+        out_channels=None,
+        use_conv=False,
+        use_scale_shift_norm=False,
+        dims=2,
+        use_checkpoint=False,
+        up=False,
+        down=False,
+    ):
+        super().__init__()
+        self.channels = channels
+        self.emb_channels = emb_channels
+        self.dropout = dropout
+        self.out_channels = out_channels or channels
+        self.use_conv = use_conv
+        self.use_checkpoint = use_checkpoint
+        self.use_scale_shift_norm = use_scale_shift_norm
+
+        self.in_layers = nn.Sequential(
+            normalization(channels),
+            nn.SiLU(),
+            conv_nd(dims, channels, self.out_channels, 3, padding=1),
+        )
+
+        self.updown = up or down
+
+        if up:
+            self.h_upd = Upsample(channels, False, dims)
+            self.x_upd = Upsample(channels, False, dims)
+        elif down:
+            self.h_upd = Downsample(channels, False, dims)
+            self.x_upd = Downsample(channels, False, dims)
+        else:
+            self.h_upd = self.x_upd = nn.Identity()
+
+        self.emb_layers = nn.Sequential(
+            nn.SiLU(),
+            linear(
+                emb_channels,
+                2 * self.out_channels if use_scale_shift_norm else self.out_channels,
+            ),
+        )
+        self.out_layers = nn.Sequential(
+            normalization(self.out_channels),
+            nn.SiLU(),
+            nn.Dropout(p=dropout),
+            zero_module(
+                conv_nd(dims, self.out_channels, self.out_channels, 3, padding=1)
+            ),
+        )
+
+        if self.out_channels == channels:
+            self.skip_connection = nn.Identity()
+        elif use_conv:
+            self.skip_connection = conv_nd(
+                dims, channels, self.out_channels, 3, padding=1
+            )
+        else:
+            self.skip_connection = conv_nd(dims, channels, self.out_channels, 1)
+
+    def forward(self, x, emb):
+        """
+        Apply the block to a Tensor, conditioned on a timestep embedding.
+        :param x: an [N x C x ...] Tensor of features.
+        :param emb: an [N x emb_channels] Tensor of timestep embeddings.
+        :return: an [N x C x ...] Tensor of outputs.
+        """
+        return checkpoint(
+            self._forward, (x, emb), self.parameters(), self.use_checkpoint
+        )
+
+
+    def _forward(self, x, emb):
+        if self.updown:
+            in_rest, in_conv = self.in_layers[:-1], self.in_layers[-1]
+            h = in_rest(x)
+            h = self.h_upd(h)
+            x = self.x_upd(x)
+            h = in_conv(h)
+        else:
+            h = self.in_layers(x)
+        emb_out = self.emb_layers(emb).type(h.dtype)
+        while len(emb_out.shape) < len(h.shape):
+            emb_out = emb_out[..., None]
+        if self.use_scale_shift_norm: # False
+            out_norm, out_rest = self.out_layers[0], self.out_layers[1:]
+            scale, shift = th.chunk(emb_out, 2, dim=1)
+            h = out_norm(h) * (1 + scale) + shift
+            h = out_rest(h)
+        else:
+            h = h + emb_out
+            h = self.out_layers(h)
+        return self.skip_connection(x) + h
+
+
+class AttentionBlock(nn.Module):
+    """
+    An attention block that allows spatial positions to attend to each other.
+    Originally ported from here, but adapted to the N-d case.
+    https://github.com/hojonathanho/diffusion/blob/1e0dceb3b3495bbe19116a5e1b3596cd0706c543/diffusion_tf/models/unet.py#L66.
+    """
+
+    def __init__(
+        self,
+        channels,
+        num_heads=1,
+        num_head_channels=-1,
+        use_checkpoint=False,
+        use_new_attention_order=False,
+    ):
+        super().__init__()
+        self.channels = channels
+        if num_head_channels == -1:
+            self.num_heads = num_heads
+        else:
+            assert (
+                channels % num_head_channels == 0
+            ), f"q,k,v channels {channels} is not divisible by num_head_channels {num_head_channels}"
+            self.num_heads = channels // num_head_channels
+        self.use_checkpoint = use_checkpoint
+        self.norm = normalization(channels)
+        self.qkv = conv_nd(1, channels, channels * 3, 1)
+        if use_new_attention_order:
+            # split qkv before split heads
+            self.attention = QKVAttention(self.num_heads)
+        else:
+            # split heads before split qkv
+            self.attention = QKVAttentionLegacy(self.num_heads)
+
+        self.proj_out = zero_module(conv_nd(1, channels, channels, 1))
+
+    def forward(self, x):
+        return checkpoint(self._forward, (x,), self.parameters(), True)   # TODO: check checkpoint usage, is True # TODO: fix the .half call!!!
+        #return pt_checkpoint(self._forward, x)  # pytorch
+
+    def _forward(self, x):
+        b, c, *spatial = x.shape
+        x = x.reshape(b, c, -1)
+        qkv = self.qkv(self.norm(x))
+        h = self.attention(qkv)
+        h = self.proj_out(h)
+        return (x + h).reshape(b, c, *spatial)
+
+
+def count_flops_attn(model, _x, y):
+    """
+    A counter for the `thop` package to count the operations in an
+    attention operation.
+    Meant to be used like:
+        macs, params = thop.profile(
+            model,
+            inputs=(inputs, timestamps),
+            custom_ops={QKVAttention: QKVAttention.count_flops},
+        )
+    """
+    b, c, *spatial = y[0].shape
+    num_spatial = int(np.prod(spatial))
+    # We perform two matmuls with the same number of ops.
+    # The first computes the weight matrix, the second computes
+    # the combination of the value vectors.
+    matmul_ops = 2 * b * (num_spatial ** 2) * c
+    model.total_ops += th.DoubleTensor([matmul_ops])
+
+
+class QKVAttentionLegacy(nn.Module):
+    """
+    A module which performs QKV attention. Matches legacy QKVAttention + input/ouput heads shaping
+    """
+
+    def __init__(self, n_heads):
+        super().__init__()
+        self.n_heads = n_heads
+
+    def forward(self, qkv):
+        """
+        Apply QKV attention.
+        :param qkv: an [N x (H * 3 * C) x T] tensor of Qs, Ks, and Vs.
+        :return: an [N x (H * C) x T] tensor after attention.
+        """
+        bs, width, length = qkv.shape
+        assert width % (3 * self.n_heads) == 0
+        ch = width // (3 * self.n_heads)
+        q, k, v = qkv.reshape(bs * self.n_heads, ch * 3, length).split(ch, dim=1)
+        scale = 1 / math.sqrt(math.sqrt(ch))
+        weight = th.einsum(
+            "bct,bcs->bts", q * scale, k * scale
+        )  # More stable with f16 than dividing afterwards
+        weight = th.softmax(weight.float(), dim=-1).type(weight.dtype)
+        a = th.einsum("bts,bcs->bct", weight, v)
+        return a.reshape(bs, -1, length)
+
+    @staticmethod
+    def count_flops(model, _x, y):
+        return count_flops_attn(model, _x, y)
+
+
+class QKVAttention(nn.Module):
+    """
+    A module which performs QKV attention and splits in a different order.
+    """
+
+    def __init__(self, n_heads):
+        super().__init__()
+        self.n_heads = n_heads
+
+    def forward(self, qkv):
+        """
+        Apply QKV attention.
+        :param qkv: an [N x (3 * H * C) x T] tensor of Qs, Ks, and Vs.
+        :return: an [N x (H * C) x T] tensor after attention.
+        """
+        bs, width, length = qkv.shape
+        assert width % (3 * self.n_heads) == 0
+        ch = width // (3 * self.n_heads)
+        q, k, v = qkv.chunk(3, dim=1)
+        scale = 1 / math.sqrt(math.sqrt(ch))
+        weight = th.einsum(
+            "bct,bcs->bts",
+            (q * scale).view(bs * self.n_heads, ch, length),
+            (k * scale).view(bs * self.n_heads, ch, length),
+        )  # More stable with f16 than dividing afterwards
+        weight = th.softmax(weight.float(), dim=-1).type(weight.dtype)
+        a = th.einsum("bts,bcs->bct", weight, v.reshape(bs * self.n_heads, ch, length))
+        return a.reshape(bs, -1, length)
+
+    @staticmethod
+    def count_flops(model, _x, y):
+        return count_flops_attn(model, _x, y)
+
+
+class UNetModel(nn.Module):
+    """
+    The full UNet model with attention and timestep embedding.
+    :param in_channels: channels in the input Tensor.
+    :param model_channels: base channel count for the model.
+    :param out_channels: channels in the output Tensor.
+    :param num_res_blocks: number of residual blocks per downsample.
+    :param attention_resolutions: a collection of downsample rates at which
+        attention will take place. May be a set, list, or tuple.
+        For example, if this contains 4, then at 4x downsampling, attention
+        will be used.
+    :param dropout: the dropout probability.
+    :param channel_mult: channel multiplier for each level of the UNet.
+    :param conv_resample: if True, use learned convolutions for upsampling and
+        downsampling.
+    :param dims: determines if the signal is 1D, 2D, or 3D.
+    :param num_classes: if specified (as an int), then this model will be
+        class-conditional with `num_classes` classes.
+    :param use_checkpoint: use gradient checkpointing to reduce memory usage.
+    :param num_heads: the number of attention heads in each attention layer.
+    :param num_heads_channels: if specified, ignore num_heads and instead use
+                               a fixed channel width per attention head.
+    :param num_heads_upsample: works with num_heads to set a different number
+                               of heads for upsampling. Deprecated.
+    :param use_scale_shift_norm: use a FiLM-like conditioning mechanism.
+    :param resblock_updown: use residual blocks for up/downsampling.
+    :param use_new_attention_order: use a different attention pattern for potentially
+                                    increased efficiency.
+    """
+
+    def __init__(
+        self,
+        image_size,
+        in_channels,
+        model_channels,
+        out_channels,
+        num_res_blocks,
+        attention_resolutions,
+        dropout=0,
+        channel_mult=(1, 2, 4, 8),
+        conv_resample=True,
+        dims=2,
+        num_classes=None,
+        use_checkpoint=False,
+        use_fp16=False,
+        num_heads=-1,
+        num_head_channels=-1,
+        num_heads_upsample=-1,
+        use_scale_shift_norm=False,
+        resblock_updown=False,
+        use_new_attention_order=False,
+        use_spatial_transformer=False,    # custom transformer support
+        transformer_depth=1,              # custom transformer support
+        context_dim=None,                 # custom transformer support
+        n_embed=None,                     # custom support for prediction of discrete ids into codebook of first stage vq model
+        legacy=True,
+        disable_self_attentions=None,
+        num_attention_blocks=None
+    ):
+        super().__init__()
+        if use_spatial_transformer:
+            assert context_dim is not None, 'Fool!! You forgot to include the dimension of your cross-attention conditioning...'
+
+        if context_dim is not None:
+            assert use_spatial_transformer, 'Fool!! You forgot to use the spatial transformer for your cross-attention conditioning...'
+            from omegaconf.listconfig import ListConfig
+            if type(context_dim) == ListConfig:
+                context_dim = list(context_dim)
+
+        if num_heads_upsample == -1:
+            num_heads_upsample = num_heads
+
+        if num_heads == -1:
+            assert num_head_channels != -1, 'Either num_heads or num_head_channels has to be set'
+
+        if num_head_channels == -1:
+            assert num_heads != -1, 'Either num_heads or num_head_channels has to be set'
+
+        self.image_size = image_size
+        self.in_channels = in_channels
+        self.model_channels = model_channels
+        self.out_channels = out_channels
+        if isinstance(num_res_blocks, int):
+            self.num_res_blocks = len(channel_mult) * [num_res_blocks]
+        else:
+            if len(num_res_blocks) != len(channel_mult):
+                raise ValueError("provide num_res_blocks either as an int (globally constant) or "
+                                 "as a list/tuple (per-level) with the same length as channel_mult")
+            self.num_res_blocks = num_res_blocks
+        #self.num_res_blocks = num_res_blocks
+        if disable_self_attentions is not None:
+            # should be a list of booleans, indicating whether to disable self-attention in TransformerBlocks or not
+            assert len(disable_self_attentions) == len(channel_mult)
+        if num_attention_blocks is not None:
+            assert len(num_attention_blocks) == len(self.num_res_blocks)
+            assert all(map(lambda i: self.num_res_blocks[i] >= num_attention_blocks[i], range(len(num_attention_blocks))))
+            print(f"Constructor of UNetModel received num_attention_blocks={num_attention_blocks}. "
+                  f"This option has LESS priority than attention_resolutions {attention_resolutions}, "
+                  f"i.e., in cases where num_attention_blocks[i] > 0 but 2**i not in attention_resolutions, "
+                  f"attention will still not be set.")  # todo: convert to warning
+
+        self.attention_resolutions = attention_resolutions
+        self.dropout = dropout
+        self.channel_mult = channel_mult
+        self.conv_resample = conv_resample
+        self.num_classes = num_classes
+        self.use_checkpoint = use_checkpoint
+        self.dtype = th.float16 if use_fp16 else th.float32
+        self.num_heads = num_heads
+        self.num_head_channels = num_head_channels
+        self.num_heads_upsample = num_heads_upsample
+        self.predict_codebook_ids = n_embed is not None
+
+        time_embed_dim = model_channels * 4
+        self.time_embed = nn.Sequential(
+            linear(model_channels, time_embed_dim),
+            nn.SiLU(),
+            linear(time_embed_dim, time_embed_dim),
+        )
+
+        if self.num_classes is not None:
+            self.label_emb = nn.Embedding(num_classes, time_embed_dim)
+
+        self.input_blocks = nn.ModuleList(
+            [
+                TimestepEmbedSequential(
+                    conv_nd(dims, in_channels, model_channels, 3, padding=1)
+                )
+            ]
+        ) # 0
+        self._feature_size = model_channels
+        input_block_chans = [model_channels]
+        ch = model_channels
+        ds = 1
+        for level, mult in enumerate(channel_mult):
+            for nr in range(self.num_res_blocks[level]):
+                layers = [
+                    ResBlock(
+                        ch,
+                        time_embed_dim,
+                        dropout,
+                        out_channels=mult * model_channels,
+                        dims=dims,
+                        use_checkpoint=use_checkpoint,
+                        use_scale_shift_norm=use_scale_shift_norm,
+                    )
+                ]
+                ch = mult * model_channels
+                if ds in attention_resolutions: # always True
+                    if num_head_channels == -1:
+                        dim_head = ch // num_heads
+                    else:
+                        num_heads = ch // num_head_channels
+                        dim_head = num_head_channels
+                    if legacy:
+                        #num_heads = 1
+                        dim_head = ch // num_heads if use_spatial_transformer else num_head_channels
+                    if exists(disable_self_attentions):
+                        disabled_sa = disable_self_attentions[level]
+                    else:
+                        disabled_sa = False
+
+                    if not exists(num_attention_blocks) or nr < num_attention_blocks[level]:
+                        layers.append(
+                            AttentionBlock(
+                                ch,
+                                use_checkpoint=use_checkpoint,
+                                num_heads=num_heads,
+                                num_head_channels=dim_head,
+                                use_new_attention_order=use_new_attention_order,
+                            ) if not use_spatial_transformer else SpatialTransformer(
+                                ch, num_heads, dim_head, depth=transformer_depth, context_dim=context_dim,
+                                disable_self_attn=disabled_sa
+                            )
+                        )
+                self.input_blocks.append(TimestepEmbedSequential(*layers))
+                self._feature_size += ch
+                input_block_chans.append(ch)
+            if level != len(channel_mult) - 1:
+                out_ch = ch
+                self.input_blocks.append(
+                    TimestepEmbedSequential(
+                        ResBlock(
+                            ch,
+                            time_embed_dim,
+                            dropout,
+                            out_channels=out_ch,
+                            dims=dims,
+                            use_checkpoint=use_checkpoint,
+                            use_scale_shift_norm=use_scale_shift_norm,
+                            down=True,
+                        )
+                        if resblock_updown
+                        else Downsample(
+                            ch, conv_resample, dims=dims, out_channels=out_ch
+                        )
+                    )
+                )
+                ch = out_ch
+                input_block_chans.append(ch)
+                ds *= 2
+                self._feature_size += ch
+
+        if num_head_channels == -1:
+            dim_head = ch // num_heads
+        else:
+            num_heads = ch // num_head_channels
+            dim_head = num_head_channels
+        if legacy:
+            #num_heads = 1
+            dim_head = ch // num_heads if use_spatial_transformer else num_head_channels
+        self.middle_block = TimestepEmbedSequential(
+            ResBlock(
+                ch,
+                time_embed_dim,
+                dropout,
+                dims=dims,
+                use_checkpoint=use_checkpoint,
+                use_scale_shift_norm=use_scale_shift_norm,
+            ),
+            AttentionBlock(
+                ch,
+                use_checkpoint=use_checkpoint,
+                num_heads=num_heads,
+                num_head_channels=dim_head,
+                use_new_attention_order=use_new_attention_order,
+            ) if not use_spatial_transformer else SpatialTransformer(  # always uses a self-attn
+                            ch, num_heads, dim_head, depth=transformer_depth, context_dim=context_dim
+                        ),
+            ResBlock(
+                ch,
+                time_embed_dim,
+                dropout,
+                dims=dims,
+                use_checkpoint=use_checkpoint,
+                use_scale_shift_norm=use_scale_shift_norm,
+            ),
+        )
+        self._feature_size += ch
+
+        self.output_blocks = nn.ModuleList([])
+        for level, mult in list(enumerate(channel_mult))[::-1]:
+            for i in range(self.num_res_blocks[level] + 1):
+                ich = input_block_chans.pop()
+                layers = [
+                    ResBlock(
+                        ch + ich,
+                        time_embed_dim,
+                        dropout,
+                        out_channels=model_channels * mult,
+                        dims=dims,
+                        use_checkpoint=use_checkpoint,
+                        use_scale_shift_norm=use_scale_shift_norm,
+                    )
+                ]
+                ch = model_channels * mult
+                if ds in attention_resolutions:
+                    if num_head_channels == -1:
+                        dim_head = ch // num_heads
+                    else:
+                        num_heads = ch // num_head_channels
+                        dim_head = num_head_channels
+                    if legacy:
+                        #num_heads = 1
+                        dim_head = ch // num_heads if use_spatial_transformer else num_head_channels
+                    if exists(disable_self_attentions):
+                        disabled_sa = disable_self_attentions[level]
+                    else:
+                        disabled_sa = False
+
+                    if not exists(num_attention_blocks) or i < num_attention_blocks[level]:
+                        layers.append(
+                            AttentionBlock(
+                                ch,
+                                use_checkpoint=use_checkpoint,
+                                num_heads=num_heads_upsample,
+                                num_head_channels=dim_head,
+                                use_new_attention_order=use_new_attention_order,
+                            ) if not use_spatial_transformer else SpatialTransformer(
+                                ch, num_heads, dim_head, depth=transformer_depth, context_dim=context_dim,
+                                disable_self_attn=disabled_sa
+                            )
+                        )
+                if level and i == self.num_res_blocks[level]:
+                    out_ch = ch
+                    layers.append(
+                        ResBlock(
+                            ch,
+                            time_embed_dim,
+                            dropout,
+                            out_channels=out_ch,
+                            dims=dims,
+                            use_checkpoint=use_checkpoint,
+                            use_scale_shift_norm=use_scale_shift_norm,
+                            up=True,
+                        )
+                        if resblock_updown
+                        else Upsample(ch, conv_resample, dims=dims, out_channels=out_ch)
+                    )
+                    ds //= 2
+                self.output_blocks.append(TimestepEmbedSequential(*layers))
+                self._feature_size += ch
+
+        self.out = nn.Sequential(
+            normalization(ch),
+            nn.SiLU(),
+            zero_module(conv_nd(dims, model_channels, out_channels, 3, padding=1)),
+        )
+        if self.predict_codebook_ids:
+            self.id_predictor = nn.Sequential(
+            normalization(ch),
+            conv_nd(dims, model_channels, n_embed, 1),
+            #nn.LogSoftmax(dim=1)  # change to cross_entropy and produce non-normalized logits
+        )
+
+    def convert_to_fp16(self):
+        """
+        Convert the torso of the model to float16.
+        """
+        self.input_blocks.apply(convert_module_to_f16)
+        self.middle_block.apply(convert_module_to_f16)
+        self.output_blocks.apply(convert_module_to_f16)
+
+    def convert_to_fp32(self):
+        """
+        Convert the torso of the model to float32.
+        """
+        self.input_blocks.apply(convert_module_to_f32)
+        self.middle_block.apply(convert_module_to_f32)
+        self.output_blocks.apply(convert_module_to_f32)
+
+    def forward(self, x, timesteps=None, context=None, y=None,**kwargs):
+        """
+        Apply the model to an input batch.
+        :param x: an [N x C x ...] Tensor of inputs.
+        :param timesteps: a 1-D batch of timesteps.
+        :param context: conditioning plugged in via crossattn
+        :param y: an [N] Tensor of labels, if class-conditional.
+        :return: an [N x C x ...] Tensor of outputs.
+        """
+        assert (y is not None) == (
+            self.num_classes is not None
+        ), "must specify y if and only if the model is class-conditional"
+        hs = []
+        t_emb = timestep_embedding(timesteps, self.model_channels, repeat_only=False) # N
+        emb = self.time_embed(t_emb) #
+
+        if self.num_classes is not None:
+            assert y.shape == (x.shape[0],)
+            emb = emb + self.label_emb(y)
+
+        h = x.type(self.dtype)
+        for module in self.input_blocks:
+            h = module(h, emb, context) # conv
+            hs.append(h)
+        h = self.middle_block(h, emb, context)
+        for module in self.output_blocks:
+            h = th.cat([h, hs.pop()], dim=1)
+            h = module(h, emb, context)
+        h = h.type(x.dtype)
+        if self.predict_codebook_ids:
+            return self.id_predictor(h)
+        else:
+            return self.out(h)
+
+
+class EncoderUNetModel(nn.Module):
+    """
+    The half UNet model with attention and timestep embedding.
+    For usage, see UNet.
+    """
+
+    def __init__(
+        self,
+        image_size,
+        in_channels,
+        model_channels,
+        out_channels,
+        num_res_blocks,
+        attention_resolutions,
+        dropout=0,
+        channel_mult=(1, 2, 4, 8),
+        conv_resample=True,
+        dims=2,
+        use_checkpoint=False,
+        use_fp16=False,
+        num_heads=1,
+        num_head_channels=-1,
+        num_heads_upsample=-1,
+        use_scale_shift_norm=False,
+        resblock_updown=False,
+        use_new_attention_order=False,
+        pool="adaptive",
+        *args,
+        **kwargs
+    ):
+        super().__init__()
+
+        if num_heads_upsample == -1:
+            num_heads_upsample = num_heads
+
+        self.in_channels = in_channels
+        self.model_channels = model_channels
+        self.out_channels = out_channels
+        self.num_res_blocks = num_res_blocks
+        self.attention_resolutions = attention_resolutions
+        self.dropout = dropout
+        self.channel_mult = channel_mult
+        self.conv_resample = conv_resample
+        self.use_checkpoint = use_checkpoint
+        self.dtype = th.float16 if use_fp16 else th.float32
+        self.num_heads = num_heads
+        self.num_head_channels = num_head_channels
+        self.num_heads_upsample = num_heads_upsample
+
+        time_embed_dim = model_channels * 4
+        self.time_embed = nn.Sequential(
+            linear(model_channels, time_embed_dim),
+            nn.SiLU(),
+            linear(time_embed_dim, time_embed_dim),
+        )
+
+        self.input_blocks = nn.ModuleList(
+            [
+                TimestepEmbedSequential(
+                    conv_nd(dims, in_channels, model_channels, 3, padding=1)
+                )
+            ]
+        )
+        self._feature_size = model_channels
+        input_block_chans = [model_channels]
+        ch = model_channels
+        ds = 1
+        for level, mult in enumerate(channel_mult):
+            for _ in range(num_res_blocks):
+                layers = [
+                    ResBlock(
+                        ch,
+                        time_embed_dim,
+                        dropout,
+                        out_channels=mult * model_channels,
+                        dims=dims,
+                        use_checkpoint=use_checkpoint,
+                        use_scale_shift_norm=use_scale_shift_norm,
+                    )
+                ]
+                ch = mult * model_channels
+                if ds in attention_resolutions:
+                    layers.append(
+                        AttentionBlock(
+                            ch,
+                            use_checkpoint=use_checkpoint,
+                            num_heads=num_heads,
+                            num_head_channels=num_head_channels,
+                            use_new_attention_order=use_new_attention_order,
+                        )
+                    )
+                self.input_blocks.append(TimestepEmbedSequential(*layers))
+                self._feature_size += ch
+                input_block_chans.append(ch)
+            if level != len(channel_mult) - 1:
+                out_ch = ch
+                self.input_blocks.append(
+                    TimestepEmbedSequential(
+                        ResBlock(
+                            ch,
+                            time_embed_dim,
+                            dropout,
+                            out_channels=out_ch,
+                            dims=dims,
+                            use_checkpoint=use_checkpoint,
+                            use_scale_shift_norm=use_scale_shift_norm,
+                            down=True,
+                        )
+                        if resblock_updown
+                        else Downsample(
+                            ch, conv_resample, dims=dims, out_channels=out_ch
+                        )
+                    )
+                )
+                ch = out_ch
+                input_block_chans.append(ch)
+                ds *= 2
+                self._feature_size += ch
+
+        self.middle_block = TimestepEmbedSequential(
+            ResBlock(
+                ch,
+                time_embed_dim,
+                dropout,
+                dims=dims,
+                use_checkpoint=use_checkpoint,
+                use_scale_shift_norm=use_scale_shift_norm,
+            ),
+            AttentionBlock(
+                ch,
+                use_checkpoint=use_checkpoint,
+                num_heads=num_heads,
+                num_head_channels=num_head_channels,
+                use_new_attention_order=use_new_attention_order,
+            ),
+            ResBlock(
+                ch,
+                time_embed_dim,
+                dropout,
+                dims=dims,
+                use_checkpoint=use_checkpoint,
+                use_scale_shift_norm=use_scale_shift_norm,
+            ),
+        )
+        self._feature_size += ch
+        self.pool = pool
+        if pool == "adaptive":
+            self.out = nn.Sequential(
+                normalization(ch),
+                nn.SiLU(),
+                nn.AdaptiveAvgPool2d((1, 1)),
+                zero_module(conv_nd(dims, ch, out_channels, 1)),
+                nn.Flatten(),
+            )
+        elif pool == "attention":
+            assert num_head_channels != -1
+            self.out = nn.Sequential(
+                normalization(ch),
+                nn.SiLU(),
+                AttentionPool2d(
+                    (image_size // ds), ch, num_head_channels, out_channels
+                ),
+            )
+        elif pool == "spatial":
+            self.out = nn.Sequential(
+                nn.Linear(self._feature_size, 2048),
+                nn.ReLU(),
+                nn.Linear(2048, self.out_channels),
+            )
+        elif pool == "spatial_v2":
+            self.out = nn.Sequential(
+                nn.Linear(self._feature_size, 2048),
+                normalization(2048),
+                nn.SiLU(),
+                nn.Linear(2048, self.out_channels),
+            )
+        else:
+            raise NotImplementedError(f"Unexpected {pool} pooling")
+
+    def convert_to_fp16(self):
+        """
+        Convert the torso of the model to float16.
+        """
+        self.input_blocks.apply(convert_module_to_f16)
+        self.middle_block.apply(convert_module_to_f16)
+
+    def convert_to_fp32(self):
+        """
+        Convert the torso of the model to float32.
+        """
+        self.input_blocks.apply(convert_module_to_f32)
+        self.middle_block.apply(convert_module_to_f32)
+
+    def forward(self, x, timesteps):
+        """
+        Apply the model to an input batch.
+        :param x: an [N x C x ...] Tensor of inputs.
+        :param timesteps: a 1-D batch of timesteps.
+        :return: an [N x K] Tensor of outputs.
+        """
+        emb = self.time_embed(timestep_embedding(timesteps, self.model_channels))
+
+        results = []
+        h = x.type(self.dtype)
+        for module in self.input_blocks:
+            h = module(h, emb)
+            if self.pool.startswith("spatial"):
+                results.append(h.type(x.dtype).mean(dim=(2, 3)))
+        h = self.middle_block(h, emb)
+        if self.pool.startswith("spatial"):
+            results.append(h.type(x.dtype).mean(dim=(2, 3)))
+            h = th.cat(results, axis=-1)
+            return self.out(h)
+        else:
+            h = h.type(x.dtype)
+            return self.out(h)
+

ldm/modules/diffusionmodules/util.py

@@ -0,0 +1,267 @@
+# adopted from
+# https://github.com/openai/improved-diffusion/blob/main/improved_diffusion/gaussian_diffusion.py
+# and
+# https://github.com/lucidrains/denoising-diffusion-pytorch/blob/7706bdfc6f527f58d33f84b7b522e61e6e3164b3/denoising_diffusion_pytorch/denoising_diffusion_pytorch.py
+# and
+# https://github.com/openai/guided-diffusion/blob/0ba878e517b276c45d1195eb29f6f5f72659a05b/guided_diffusion/nn.py
+#
+# thanks!
+
+
+import os
+import math
+import torch
+import torch.nn as nn
+import numpy as np
+from einops import repeat
+
+from ldm.util import instantiate_from_config
+
+
+def make_beta_schedule(schedule, n_timestep, linear_start=1e-4, linear_end=2e-2, cosine_s=8e-3):
+    if schedule == "linear":
+        betas = (
+                torch.linspace(linear_start ** 0.5, linear_end ** 0.5, n_timestep, dtype=torch.float64) ** 2
+        )
+
+    elif schedule == "cosine":
+        timesteps = (
+                torch.arange(n_timestep + 1, dtype=torch.float64) / n_timestep + cosine_s
+        )
+        alphas = timesteps / (1 + cosine_s) * np.pi / 2
+        alphas = torch.cos(alphas).pow(2)
+        alphas = alphas / alphas[0]
+        betas = 1 - alphas[1:] / alphas[:-1]
+        betas = np.clip(betas, a_min=0, a_max=0.999)
+
+    elif schedule == "sqrt_linear":
+        betas = torch.linspace(linear_start, linear_end, n_timestep, dtype=torch.float64)
+    elif schedule == "sqrt":
+        betas = torch.linspace(linear_start, linear_end, n_timestep, dtype=torch.float64) ** 0.5
+    else:
+        raise ValueError(f"schedule '{schedule}' unknown.")
+    return betas.numpy()
+
+
+def make_ddim_timesteps(ddim_discr_method, num_ddim_timesteps, num_ddpm_timesteps, verbose=True):
+    if ddim_discr_method == 'uniform':
+        c = num_ddpm_timesteps // num_ddim_timesteps
+        ddim_timesteps = np.asarray(list(range(0, num_ddpm_timesteps, c)))
+    elif ddim_discr_method == 'quad':
+        ddim_timesteps = ((np.linspace(0, np.sqrt(num_ddpm_timesteps * .8), num_ddim_timesteps)) ** 2).astype(int)
+    else:
+        raise NotImplementedError(f'There is no ddim discretization method called "{ddim_discr_method}"')
+
+    # assert ddim_timesteps.shape[0] == num_ddim_timesteps
+    # add one to get the final alpha values right (the ones from first scale to data during sampling)
+    steps_out = ddim_timesteps + 1
+    if verbose:
+        print(f'Selected timesteps for ddim sampler: {steps_out}')
+    return steps_out
+
+
+def make_ddim_sampling_parameters(alphacums, ddim_timesteps, eta, verbose=True):
+    # select alphas for computing the variance schedule
+    alphas = alphacums[ddim_timesteps]
+    alphas_prev = np.asarray([alphacums[0]] + alphacums[ddim_timesteps[:-1]].tolist())
+
+    # according the the formula provided in https://arxiv.org/abs/2010.02502
+    sigmas = eta * np.sqrt((1 - alphas_prev) / (1 - alphas) * (1 - alphas / alphas_prev))
+    if verbose:
+        print(f'Selected alphas for ddim sampler: a_t: {alphas}; a_(t-1): {alphas_prev}')
+        print(f'For the chosen value of eta, which is {eta}, '
+              f'this results in the following sigma_t schedule for ddim sampler {sigmas}')
+    return sigmas, alphas, alphas_prev
+
+
+def betas_for_alpha_bar(num_diffusion_timesteps, alpha_bar, max_beta=0.999):
+    """
+    Create a beta schedule that discretizes the given alpha_t_bar function,
+    which defines the cumulative product of (1-beta) over time from t = [0,1].
+    :param num_diffusion_timesteps: the number of betas to produce.
+    :param alpha_bar: a lambda that takes an argument t from 0 to 1 and
+                      produces the cumulative product of (1-beta) up to that
+                      part of the diffusion process.
+    :param max_beta: the maximum beta to use; use values lower than 1 to
+                     prevent singularities.
+    """
+    betas = []
+    for i in range(num_diffusion_timesteps):
+        t1 = i / num_diffusion_timesteps
+        t2 = (i + 1) / num_diffusion_timesteps
+        betas.append(min(1 - alpha_bar(t2) / alpha_bar(t1), max_beta))
+    return np.array(betas)
+
+
+def extract_into_tensor(a, t, x_shape):
+    b, *_ = t.shape
+    out = a.gather(-1, t)
+    return out.reshape(b, *((1,) * (len(x_shape) - 1)))
+
+
+def checkpoint(func, inputs, params, flag):
+    """
+    Evaluate a function without caching intermediate activations, allowing for
+    reduced memory at the expense of extra compute in the backward pass.
+    :param func: the function to evaluate.
+    :param inputs: the argument sequence to pass to `func`.
+    :param params: a sequence of parameters `func` depends on but does not
+                   explicitly take as arguments.
+    :param flag: if False, disable gradient checkpointing.
+    """
+    if flag:
+        args = tuple(inputs) + tuple(params)
+        return CheckpointFunction.apply(func, len(inputs), *args)
+    else:
+        return func(*inputs)
+
+
+class CheckpointFunction(torch.autograd.Function):
+    @staticmethod
+    def forward(ctx, run_function, length, *args):
+        ctx.run_function = run_function
+        ctx.input_tensors = list(args[:length])
+        ctx.input_params = list(args[length:])
+
+        with torch.no_grad():
+            output_tensors = ctx.run_function(*ctx.input_tensors)
+        return output_tensors
+
+    @staticmethod
+    def backward(ctx, *output_grads):
+        ctx.input_tensors = [x.detach().requires_grad_(True) for x in ctx.input_tensors]
+        with torch.enable_grad():
+            # Fixes a bug where the first op in run_function modifies the
+            # Tensor storage in place, which is not allowed for detach()'d
+            # Tensors.
+            shallow_copies = [x.view_as(x) for x in ctx.input_tensors]
+            output_tensors = ctx.run_function(*shallow_copies)
+        input_grads = torch.autograd.grad(
+            output_tensors,
+            ctx.input_tensors + ctx.input_params,
+            output_grads,
+            allow_unused=True,
+        )
+        del ctx.input_tensors
+        del ctx.input_params
+        del output_tensors
+        return (None, None) + input_grads
+
+
+def timestep_embedding(timesteps, dim, max_period=10000, repeat_only=False):
+    """
+    Create sinusoidal timestep embeddings.
+    :param timesteps: a 1-D Tensor of N indices, one per batch element.
+                      These may be fractional.
+    :param dim: the dimension of the output.
+    :param max_period: controls the minimum frequency of the embeddings.
+    :return: an [N x dim] Tensor of positional embeddings.
+    """
+    if not repeat_only:
+        half = dim // 2
+        freqs = torch.exp(
+            -math.log(max_period) * torch.arange(start=0, end=half, dtype=torch.float32) / half
+        ).to(device=timesteps.device)
+        args = timesteps[:, None].float() * freqs[None]
+        embedding = torch.cat([torch.cos(args), torch.sin(args)], dim=-1)
+        if dim % 2:
+            embedding = torch.cat([embedding, torch.zeros_like(embedding[:, :1])], dim=-1)
+    else:
+        embedding = repeat(timesteps, 'b -> b d', d=dim)
+    return embedding
+
+
+def zero_module(module):
+    """
+    Zero out the parameters of a module and return it.
+    """
+    for p in module.parameters():
+        p.detach().zero_()
+    return module
+
+
+def scale_module(module, scale):
+    """
+    Scale the parameters of a module and return it.
+    """
+    for p in module.parameters():
+        p.detach().mul_(scale)
+    return module
+
+
+def mean_flat(tensor):
+    """
+    Take the mean over all non-batch dimensions.
+    """
+    return tensor.mean(dim=list(range(1, len(tensor.shape))))
+
+
+def normalization(channels):
+    """
+    Make a standard normalization layer.
+    :param channels: number of input channels.
+    :return: an nn.Module for normalization.
+    """
+    return GroupNorm32(32, channels)
+
+
+# PyTorch 1.7 has SiLU, but we support PyTorch 1.5.
+class SiLU(nn.Module):
+    def forward(self, x):
+        return x * torch.sigmoid(x)
+
+
+class GroupNorm32(nn.GroupNorm):
+    def forward(self, x):
+        return super().forward(x.float()).type(x.dtype)
+
+def conv_nd(dims, *args, **kwargs):
+    """
+    Create a 1D, 2D, or 3D convolution module.
+    """
+    if dims == 1:
+        return nn.Conv1d(*args, **kwargs)
+    elif dims == 2:
+        return nn.Conv2d(*args, **kwargs)
+    elif dims == 3:
+        return nn.Conv3d(*args, **kwargs)
+    raise ValueError(f"unsupported dimensions: {dims}")
+
+
+def linear(*args, **kwargs):
+    """
+    Create a linear module.
+    """
+    return nn.Linear(*args, **kwargs)
+
+
+def avg_pool_nd(dims, *args, **kwargs):
+    """
+    Create a 1D, 2D, or 3D average pooling module.
+    """
+    if dims == 1:
+        return nn.AvgPool1d(*args, **kwargs)
+    elif dims == 2:
+        return nn.AvgPool2d(*args, **kwargs)
+    elif dims == 3:
+        return nn.AvgPool3d(*args, **kwargs)
+    raise ValueError(f"unsupported dimensions: {dims}")
+
+
+class HybridConditioner(nn.Module):
+
+    def __init__(self, c_concat_config, c_crossattn_config):
+        super().__init__()
+        self.concat_conditioner = instantiate_from_config(c_concat_config)
+        self.crossattn_conditioner = instantiate_from_config(c_crossattn_config)
+
+    def forward(self, c_concat, c_crossattn):
+        c_concat = self.concat_conditioner(c_concat)
+        c_crossattn = self.crossattn_conditioner(c_crossattn)
+        return {'c_concat': [c_concat], 'c_crossattn': [c_crossattn]}
+
+
+def noise_like(shape, device, repeat=False):
+    repeat_noise = lambda: torch.randn((1, *shape[1:]), device=device).repeat(shape[0], *((1,) * (len(shape) - 1)))
+    noise = lambda: torch.randn(shape, device=device)
+    return repeat_noise() if repeat else noise()

ldm/modules/distributions/distributions.py

@@ -0,0 +1,92 @@
+import torch
+import numpy as np
+
+
+class AbstractDistribution:
+    def sample(self):
+        raise NotImplementedError()
+
+    def mode(self):
+        raise NotImplementedError()
+
+
+class DiracDistribution(AbstractDistribution):
+    def __init__(self, value):
+        self.value = value
+
+    def sample(self):
+        return self.value
+
+    def mode(self):
+        return self.value
+
+
+class DiagonalGaussianDistribution(object):
+    def __init__(self, parameters, deterministic=False):
+        self.parameters = parameters
+        self.mean, self.logvar = torch.chunk(parameters, 2, dim=1)
+        self.logvar = torch.clamp(self.logvar, -30.0, 20.0)
+        self.deterministic = deterministic
+        self.std = torch.exp(0.5 * self.logvar)
+        self.var = torch.exp(self.logvar)
+        if self.deterministic:
+            self.var = self.std = torch.zeros_like(self.mean).to(device=self.parameters.device)
+
+    def sample(self):
+        x = self.mean + self.std * torch.randn(self.mean.shape).to(device=self.parameters.device)
+        return x
+
+    def kl(self, other=None):
+        if self.deterministic:
+            return torch.Tensor([0.])
+        else:
+            if other is None:
+                return 0.5 * torch.sum(torch.pow(self.mean, 2)
+                                       + self.var - 1.0 - self.logvar,
+                                       dim=[1, 2, 3])
+            else:
+                return 0.5 * torch.sum(
+                    torch.pow(self.mean - other.mean, 2) / other.var
+                    + self.var / other.var - 1.0 - self.logvar + other.logvar,
+                    dim=[1, 2, 3])
+
+    def nll(self, sample, dims=[1,2,3]):
+        if self.deterministic:
+            return torch.Tensor([0.])
+        logtwopi = np.log(2.0 * np.pi)
+        return 0.5 * torch.sum(
+            logtwopi + self.logvar + torch.pow(sample - self.mean, 2) / self.var,
+            dim=dims)
+
+    def mode(self):
+        return self.mean
+
+
+def normal_kl(mean1, logvar1, mean2, logvar2):
+    """
+    source: https://github.com/openai/guided-diffusion/blob/27c20a8fab9cb472df5d6bdd6c8d11c8f430b924/guided_diffusion/losses.py#L12
+    Compute the KL divergence between two gaussians.
+    Shapes are automatically broadcasted, so batches can be compared to
+    scalars, among other use cases.
+    """
+    tensor = None
+    for obj in (mean1, logvar1, mean2, logvar2):
+        if isinstance(obj, torch.Tensor):
+            tensor = obj
+            break
+    assert tensor is not None, "at least one argument must be a Tensor"
+
+    # Force variances to be Tensors. Broadcasting helps convert scalars to
+    # Tensors, but it does not work for torch.exp().
+    logvar1, logvar2 = [
+        x if isinstance(x, torch.Tensor) else torch.tensor(x).to(tensor)
+        for x in (logvar1, logvar2)
+    ]
+
+    return 0.5 * (
+        -1.0
+        + logvar2
+        - logvar1
+        + torch.exp(logvar1 - logvar2)
+        + ((mean1 - mean2) ** 2) * torch.exp(-logvar2)
+    )

ldm/modules/encoders/modules.py

@@ -0,0 +1,550 @@
+import torch
+import torch.nn as nn
+import numpy as np
+from functools import partial
+import kornia
+
+from ldm.modules.x_transformer import Encoder, TransformerWrapper  # TODO: can we directly rely on lucidrains code and simply add this as a reuirement? --> test
+from ldm.util import default
+import clip
+
+
+class AbstractEncoder(nn.Module):
+    def __init__(self):
+        super().__init__()
+
+    def encode(self, *args, **kwargs):
+        raise NotImplementedError
+
+class IdentityEncoder(AbstractEncoder):
+
+    def encode(self, x):
+        return x
+
+class FaceClipEncoder(AbstractEncoder):
+    def __init__(self, augment=True, retreival_key=None):
+        super().__init__()
+        self.encoder = FrozenCLIPImageEmbedder()
+        self.augment = augment
+        self.retreival_key = retreival_key
+
+    def forward(self, img):
+        encodings = []
+        with torch.no_grad():
+            x_offset = 125
+            if self.retreival_key:
+                # Assumes retrieved image are packed into the second half of channels
+                face = img[:,3:,190:440,x_offset:(512-x_offset)]
+                other = img[:,:3,...].clone()
+            else:
+                face = img[:,:,190:440,x_offset:(512-x_offset)]
+                other = img.clone()
+
+            if self.augment:
+                face = K.RandomHorizontalFlip()(face)
+
+            other[:,:,190:440,x_offset:(512-x_offset)] *= 0
+            encodings = [
+                self.encoder.encode(face),
+                self.encoder.encode(other),
+            ]
+
+        return torch.cat(encodings, dim=1)
+
+    def encode(self, img):
+        if isinstance(img, list):
+            # Uncondition
+            return torch.zeros((1, 2, 768), device=self.encoder.model.visual.conv1.weight.device)
+
+        return self(img)
+
+class FaceIdClipEncoder(AbstractEncoder):
+    def __init__(self):
+        super().__init__()
+        self.encoder = FrozenCLIPImageEmbedder()
+        for p in self.encoder.parameters():
+            p.requires_grad = False
+        self.id = FrozenFaceEncoder("/home/jpinkney/code/stable-diffusion/model_ir_se50.pth", augment=True)
+
+    def forward(self, img):
+        encodings = []
+        with torch.no_grad():
+            face = kornia.geometry.resize(img, (256, 256),
+                            interpolation='bilinear', align_corners=True)
+
+            other = img.clone()
+            other[:,:,184:452,122:396] *= 0
+            encodings = [
+                self.id.encode(face),
+                self.encoder.encode(other),
+            ]
+
+        return torch.cat(encodings, dim=1)
+
+    def encode(self, img):
+        if isinstance(img, list):
+            # Uncondition
+            return torch.zeros((1, 2, 768), device=self.encoder.model.visual.conv1.weight.device)
+
+        return self(img)
+
+class ClassEmbedder(nn.Module):
+    def __init__(self, embed_dim, n_classes=1000, key='class'):
+        super().__init__()
+        self.key = key
+        self.embedding = nn.Embedding(n_classes, embed_dim)
+
+    def forward(self, batch, key=None):
+        if key is None:
+            key = self.key
+        # this is for use in crossattn
+        c = batch[key][:, None]
+        c = self.embedding(c)
+        return c
+
+
+class TransformerEmbedder(AbstractEncoder):
+    """Some transformer encoder layers"""
+    def __init__(self, n_embed, n_layer, vocab_size, max_seq_len=77, device="cuda"):
+        super().__init__()
+        self.device = device
+        self.transformer = TransformerWrapper(num_tokens=vocab_size, max_seq_len=max_seq_len,
+                                              attn_layers=Encoder(dim=n_embed, depth=n_layer))
+
+    def forward(self, tokens):
+        tokens = tokens.to(self.device)  # meh
+        z = self.transformer(tokens, return_embeddings=True)
+        return z
+
+    def encode(self, x):
+        return self(x)
+
+
+class BERTTokenizer(AbstractEncoder):
+    """ Uses a pretrained BERT tokenizer by huggingface. Vocab size: 30522 (?)"""
+    def __init__(self, device="cuda", vq_interface=True, max_length=77):
+        super().__init__()
+        from transformers import BertTokenizerFast  # TODO: add to reuquirements
+        self.tokenizer = BertTokenizerFast.from_pretrained("bert-base-uncased")
+        self.device = device
+        self.vq_interface = vq_interface
+        self.max_length = max_length
+
+    def forward(self, text):
+        batch_encoding = self.tokenizer(text, truncation=True, max_length=self.max_length, return_length=True,
+                                        return_overflowing_tokens=False, padding="max_length", return_tensors="pt")
+        tokens = batch_encoding["input_ids"].to(self.device)
+        return tokens
+
+    @torch.no_grad()
+    def encode(self, text):
+        tokens = self(text)
+        if not self.vq_interface:
+            return tokens
+        return None, None, [None, None, tokens]
+
+    def decode(self, text):
+        return text
+
+
+class BERTEmbedder(AbstractEncoder):
+    """Uses the BERT tokenizr model and add some transformer encoder layers"""
+    def __init__(self, n_embed, n_layer, vocab_size=30522, max_seq_len=77,
+                 device="cuda",use_tokenizer=True, embedding_dropout=0.0):
+        super().__init__()
+        self.use_tknz_fn = use_tokenizer
+        if self.use_tknz_fn:
+            self.tknz_fn = BERTTokenizer(vq_interface=False, max_length=max_seq_len)
+        self.device = device
+        self.transformer = TransformerWrapper(num_tokens=vocab_size, max_seq_len=max_seq_len,
+                                              attn_layers=Encoder(dim=n_embed, depth=n_layer),
+                                              emb_dropout=embedding_dropout)
+
+    def forward(self, text):
+        if self.use_tknz_fn:
+            tokens = self.tknz_fn(text)#.to(self.device)
+        else:
+            tokens = text
+        z = self.transformer(tokens, return_embeddings=True)
+        return z
+
+    def encode(self, text):
+        # output of length 77
+        return self(text)
+
+
+from transformers import T5Tokenizer, T5EncoderModel, CLIPTokenizer, CLIPTextModel
+
+def disabled_train(self, mode=True):
+    """Overwrite model.train with this function to make sure train/eval mode
+    does not change anymore."""
+    return self
+
+
+class FrozenT5Embedder(AbstractEncoder):
+    """Uses the T5 transformer encoder for text"""
+    def __init__(self, version="google/t5-v1_1-large", device="cuda", max_length=77):  # others are google/t5-v1_1-xl and google/t5-v1_1-xxl
+        super().__init__()
+        self.tokenizer = T5Tokenizer.from_pretrained(version, cache_dir='/apdcephfs/private_rondyliu/projects/huggingface_models')
+        self.transformer = T5EncoderModel.from_pretrained(version, cache_dir='/apdcephfs/private_rondyliu/projects/huggingface_models')
+        self.device = device
+        self.max_length = max_length   # TODO: typical value?
+        self.freeze()
+
+    def freeze(self):
+        self.transformer = self.transformer.eval()
+        #self.train = disabled_train
+        for param in self.parameters():
+            param.requires_grad = False
+
+    def forward(self, text):
+        batch_encoding = self.tokenizer(text, truncation=True, max_length=self.max_length, return_length=True,
+                                        return_overflowing_tokens=False, padding="max_length", return_tensors="pt")
+        tokens = batch_encoding["input_ids"].to(self.device)
+        outputs = self.transformer(input_ids=tokens)
+
+        z = outputs.last_hidden_state
+        return z
+
+    def encode(self, text):
+        return self(text)
+
+from ldm.thirdp.psp.id_loss import IDFeatures
+import kornia.augmentation as K
+
+class FrozenFaceEncoder(AbstractEncoder):
+    def __init__(self, model_path, augment=False):
+        super().__init__()
+        self.loss_fn = IDFeatures(model_path)
+        # face encoder is frozen
+        for p in self.loss_fn.parameters():
+            p.requires_grad = False
+        # Mapper is trainable
+        self.mapper = torch.nn.Linear(512, 768)
+        p = 0.25
+        if augment:
+            self.augment = K.AugmentationSequential(
+                K.RandomHorizontalFlip(p=0.5),
+                K.RandomEqualize(p=p),
+                # K.RandomPlanckianJitter(p=p),
+                # K.RandomPlasmaBrightness(p=p),
+                # K.RandomPlasmaContrast(p=p),
+                # K.ColorJiggle(0.02, 0.2, 0.2, p=p),
+            )
+        else:
+            self.augment = False
+
+    def forward(self, img):
+        if isinstance(img, list):
+            # Uncondition
+            return torch.zeros((1, 1, 768), device=self.mapper.weight.device)
+
+        if self.augment is not None:
+            # Transforms require 0-1
+            img = self.augment((img + 1)/2)
+            img = 2*img - 1
+
+        feat = self.loss_fn(img, crop=True)
+        feat = self.mapper(feat.unsqueeze(1))
+        return feat
+
+    def encode(self, img):
+        return self(img)
+
+class FrozenCLIPEmbedder(AbstractEncoder):
+    """Uses the CLIP transformer encoder for text (from huggingface)"""
+    def __init__(self, version="openai/clip-vit-large-patch14", device="cuda", max_length=77):  # clip-vit-base-patch32
+        super().__init__()
+        self.tokenizer = CLIPTokenizer.from_pretrained(version, cache_dir='/apdcephfs/private_rondyliu/projects/huggingface_models')
+        self.transformer = CLIPTextModel.from_pretrained(version, cache_dir='/apdcephfs/private_rondyliu/projects/huggingface_models')
+        self.device = device
+        self.max_length = max_length   # TODO: typical value?
+        self.freeze()
+
+    def freeze(self):
+        self.transformer = self.transformer.eval()
+        #self.train = disabled_train
+        for param in self.parameters():
+            param.requires_grad = False
+
+    def forward(self, text):
+        batch_encoding = self.tokenizer(text, truncation=True, max_length=self.max_length, return_length=True,
+                                        return_overflowing_tokens=False, padding="max_length", return_tensors="pt")
+        tokens = batch_encoding["input_ids"].to(self.device)
+        outputs = self.transformer(input_ids=tokens)
+
+        z = outputs.last_hidden_state
+        return z
+
+    def encode(self, text):
+        return self(text)
+
+import torch.nn.functional as F
+from transformers import CLIPVisionModel
+class ClipImageProjector(AbstractEncoder):
+    """
+        Uses the CLIP image encoder.
+        """
+    def __init__(self, version="openai/clip-vit-large-patch14", max_length=77):  # clip-vit-base-patch32
+        super().__init__()
+        self.model = CLIPVisionModel.from_pretrained(version)
+        self.model.train()
+        self.max_length = max_length   # TODO: typical value?
+        self.antialias = True
+        self.mapper = torch.nn.Linear(1024, 768)
+        self.register_buffer('mean', torch.Tensor([0.48145466, 0.4578275, 0.40821073]), persistent=False)
+        self.register_buffer('std', torch.Tensor([0.26862954, 0.26130258, 0.27577711]), persistent=False)
+        null_cond = self.get_null_cond(version, max_length)
+        self.register_buffer('null_cond', null_cond)
+
+    @torch.no_grad()
+    def get_null_cond(self, version, max_length):
+        device = self.mean.device
+        embedder = FrozenCLIPEmbedder(version=version, device=device, max_length=max_length)
+        null_cond = embedder([""])
+        return null_cond
+
+    def preprocess(self, x):
+        # Expects inputs in the range -1, 1
+        x = kornia.geometry.resize(x, (224, 224),
+                                   interpolation='bicubic',align_corners=True,
+                                   antialias=self.antialias)
+        x = (x + 1.) / 2.
+        # renormalize according to clip
+        x = kornia.enhance.normalize(x, self.mean, self.std)
+        return x
+
+    def forward(self, x):
+        if isinstance(x, list):
+            return self.null_cond
+        # x is assumed to be in range [-1,1]
+        x = self.preprocess(x)
+        outputs = self.model(pixel_values=x)
+        last_hidden_state = outputs.last_hidden_state
+        last_hidden_state = self.mapper(last_hidden_state)
+        return F.pad(last_hidden_state, [0,0, 0,self.max_length-last_hidden_state.shape[1], 0,0])
+
+    def encode(self, im):
+        return self(im)
+
+class ProjectedFrozenCLIPEmbedder(AbstractEncoder):
+    def __init__(self, version="openai/clip-vit-large-patch14", device="cuda", max_length=77):  # clip-vit-base-patch32
+        super().__init__()
+        self.embedder = FrozenCLIPEmbedder(version=version, device=device, max_length=max_length)
+        self.projection = torch.nn.Linear(768, 768)
+
+    def forward(self, text):
+        z = self.embedder(text)
+        return self.projection(z)
+
+    def encode(self, text):
+        return self(text)
+
+class FrozenCLIPImageEmbedder(AbstractEncoder):
+    """
+        Uses the CLIP image encoder.
+        Not actually frozen... If you want that set cond_stage_trainable=False in cfg
+        """
+    def __init__(
+            self,
+            model='ViT-L/14',
+            jit=False,
+            device='cpu',
+            antialias=False,
+        ):
+        super().__init__()
+        self.model, _ = clip.load(name=model, device=device, jit=jit)
+        # We don't use the text part so delete it
+        del self.model.transformer
+        self.antialias = antialias
+        self.register_buffer('mean', torch.Tensor([0.48145466, 0.4578275, 0.40821073]), persistent=False)
+        self.register_buffer('std', torch.Tensor([0.26862954, 0.26130258, 0.27577711]), persistent=False)
+
+    def preprocess(self, x):
+        # Expects inputs in the range -1, 1
+        x = kornia.geometry.resize(x, (224, 224),
+                                   interpolation='bicubic',align_corners=True,
+                                   antialias=self.antialias)
+        x = (x + 1.) / 2.
+        # renormalize according to clip
+        x = kornia.enhance.normalize(x, self.mean, self.std)
+        return x
+
+    def forward(self, x):
+        # x is assumed to be in range [-1,1]
+        if isinstance(x, list):
+            # [""] denotes condition dropout for ucg
+            device = self.model.visual.conv1.weight.device
+            return torch.zeros(1, 768, device=device)
+        return self.model.encode_image(self.preprocess(x)).float()
+
+    def encode(self, im):
+        return self(im).unsqueeze(1)
+
+from torchvision import transforms
+import random
+
+class FrozenCLIPImageMutliEmbedder(AbstractEncoder):
+    """
+        Uses the CLIP image encoder.
+        Not actually frozen... If you want that set cond_stage_trainable=False in cfg
+        """
+    def __init__(
+            self,
+            model='ViT-L/14',
+            jit=False,
+            device='cpu',
+            antialias=True,
+            max_crops=5,
+        ):
+        super().__init__()
+        self.model, _ = clip.load(name=model, device=device, jit=jit)
+        # We don't use the text part so delete it
+        del self.model.transformer
+        self.antialias = antialias
+        self.register_buffer('mean', torch.Tensor([0.48145466, 0.4578275, 0.40821073]), persistent=False)
+        self.register_buffer('std', torch.Tensor([0.26862954, 0.26130258, 0.27577711]), persistent=False)
+        self.max_crops = max_crops
+
+    def preprocess(self, x):
+
+        # Expects inputs in the range -1, 1
+        randcrop = transforms.RandomResizedCrop(224, scale=(0.085, 1.0), ratio=(1,1))
+        max_crops = self.max_crops
+        patches = []
+        crops = [randcrop(x) for _ in range(max_crops)]
+        patches.extend(crops)
+        x = torch.cat(patches, dim=0)
+        x = (x + 1.) / 2.
+        # renormalize according to clip
+        x = kornia.enhance.normalize(x, self.mean, self.std)
+        return x
+
+    def forward(self, x):
+        # x is assumed to be in range [-1,1]
+        if isinstance(x, list):
+            # [""] denotes condition dropout for ucg
+            device = self.model.visual.conv1.weight.device
+            return torch.zeros(1, self.max_crops, 768, device=device)
+        batch_tokens = []
+        for im in x:
+            patches = self.preprocess(im.unsqueeze(0))
+            tokens = self.model.encode_image(patches).float()
+            for t in tokens:
+                if random.random() < 0.1:
+                    t *= 0
+            batch_tokens.append(tokens.unsqueeze(0))
+
+        return torch.cat(batch_tokens, dim=0)
+
+    def encode(self, im):
+        return self(im)
+
+class SpatialRescaler(nn.Module):
+    def __init__(self,
+                 n_stages=1,
+                 method='bilinear',
+                 multiplier=0.5,
+                 in_channels=3,
+                 out_channels=None,
+                 bias=False):
+        super().__init__()
+        self.n_stages = n_stages
+        assert self.n_stages >= 0
+        assert method in ['nearest','linear','bilinear','trilinear','bicubic','area']
+        self.multiplier = multiplier
+        self.interpolator = partial(torch.nn.functional.interpolate, mode=method)
+        self.remap_output = out_channels is not None
+        if self.remap_output:
+            print(f'Spatial Rescaler mapping from {in_channels} to {out_channels} channels after resizing.')
+            self.channel_mapper = nn.Conv2d(in_channels,out_channels,1,bias=bias)
+
+    def forward(self,x):
+        for stage in range(self.n_stages):
+            x = self.interpolator(x, scale_factor=self.multiplier)
+
+
+        if self.remap_output:
+            x = self.channel_mapper(x)
+        return x
+
+    def encode(self, x):
+        return self(x)
+
+
+from ldm.util import instantiate_from_config
+from ldm.modules.diffusionmodules.util import make_beta_schedule, extract_into_tensor, noise_like
+
+
+class LowScaleEncoder(nn.Module):
+    def __init__(self, model_config, linear_start, linear_end, timesteps=1000, max_noise_level=250, output_size=64,
+                 scale_factor=1.0):
+        super().__init__()
+        self.max_noise_level = max_noise_level
+        self.model = instantiate_from_config(model_config)
+        self.augmentation_schedule = self.register_schedule(timesteps=timesteps, linear_start=linear_start,
+                                                            linear_end=linear_end)
+        self.out_size = output_size
+        self.scale_factor = scale_factor
+
+    def register_schedule(self, beta_schedule="linear", timesteps=1000,
+                          linear_start=1e-4, linear_end=2e-2, cosine_s=8e-3):
+        betas = make_beta_schedule(beta_schedule, timesteps, linear_start=linear_start, linear_end=linear_end,
+                                   cosine_s=cosine_s)
+        alphas = 1. - betas
+        alphas_cumprod = np.cumprod(alphas, axis=0)
+        alphas_cumprod_prev = np.append(1., alphas_cumprod[:-1])
+
+        timesteps, = betas.shape
+        self.num_timesteps = int(timesteps)
+        self.linear_start = linear_start
+        self.linear_end = linear_end
+        assert alphas_cumprod.shape[0] == self.num_timesteps, 'alphas have to be defined for each timestep'
+
+        to_torch = partial(torch.tensor, dtype=torch.float32)
+
+        self.register_buffer('betas', to_torch(betas))
+        self.register_buffer('alphas_cumprod', to_torch(alphas_cumprod))
+        self.register_buffer('alphas_cumprod_prev', to_torch(alphas_cumprod_prev))
+
+        # calculations for diffusion q(x_t | x_{t-1}) and others
+        self.register_buffer('sqrt_alphas_cumprod', to_torch(np.sqrt(alphas_cumprod)))
+        self.register_buffer('sqrt_one_minus_alphas_cumprod', to_torch(np.sqrt(1. - alphas_cumprod)))
+        self.register_buffer('log_one_minus_alphas_cumprod', to_torch(np.log(1. - alphas_cumprod)))
+        self.register_buffer('sqrt_recip_alphas_cumprod', to_torch(np.sqrt(1. / alphas_cumprod)))
+        self.register_buffer('sqrt_recipm1_alphas_cumprod', to_torch(np.sqrt(1. / alphas_cumprod - 1)))
+
+    def q_sample(self, x_start, t, noise=None):
+        noise = default(noise, lambda: torch.randn_like(x_start))
+        return (extract_into_tensor(self.sqrt_alphas_cumprod, t, x_start.shape) * x_start +
+                extract_into_tensor(self.sqrt_one_minus_alphas_cumprod, t, x_start.shape) * noise)
+
+    def forward(self, x):
+        z = self.model.encode(x).sample()
+        z = z * self.scale_factor
+        noise_level = torch.randint(0, self.max_noise_level, (x.shape[0],), device=x.device).long()
+        z = self.q_sample(z, noise_level)
+        if self.out_size is not None:
+            z = torch.nn.functional.interpolate(z, size=self.out_size, mode="nearest")  # TODO: experiment with mode
+        # z = z.repeat_interleave(2, -2).repeat_interleave(2, -1)
+        return z, noise_level
+
+    def decode(self, z):
+        z = z / self.scale_factor
+        return self.model.decode(z)
+
+
+if __name__ == "__main__":
+    from ldm.util import count_params
+    sentences = ["a hedgehog drinking a whiskey", "der mond ist aufgegangen", "Ein Satz mit vielen Sonderzeichen: äöü ß ?! : 'xx-y/@s'"]
+    model = FrozenT5Embedder(version="google/t5-v1_1-xl").cuda()
+    count_params(model, True)
+    z = model(sentences)
+    print(z.shape)
+
+    model = FrozenCLIPEmbedder().cuda()
+    count_params(model, True)
+    z = model(sentences)
+    print(z.shape)
+
+    print("done.")

ldm/modules/x_transformer.py

@@ -0,0 +1,641 @@
+"""shout-out to https://github.com/lucidrains/x-transformers/tree/main/x_transformers"""
+import torch
+from torch import nn, einsum
+import torch.nn.functional as F
+from functools import partial
+from inspect import isfunction
+from collections import namedtuple
+from einops import rearrange, repeat, reduce
+
+# constants
+
+DEFAULT_DIM_HEAD = 64
+
+Intermediates = namedtuple('Intermediates', [
+    'pre_softmax_attn',
+    'post_softmax_attn'
+])
+
+LayerIntermediates = namedtuple('Intermediates', [
+    'hiddens',
+    'attn_intermediates'
+])
+
+
+class AbsolutePositionalEmbedding(nn.Module):
+    def __init__(self, dim, max_seq_len):
+        super().__init__()
+        self.emb = nn.Embedding(max_seq_len, dim)
+        self.init_()
+
+    def init_(self):
+        nn.init.normal_(self.emb.weight, std=0.02)
+
+    def forward(self, x):
+        n = torch.arange(x.shape[1], device=x.device)
+        return self.emb(n)[None, :, :]
+
+
+class FixedPositionalEmbedding(nn.Module):
+    def __init__(self, dim):
+        super().__init__()
+        inv_freq = 1. / (10000 ** (torch.arange(0, dim, 2).float() / dim))
+        self.register_buffer('inv_freq', inv_freq)
+
+    def forward(self, x, seq_dim=1, offset=0):
+        t = torch.arange(x.shape[seq_dim], device=x.device).type_as(self.inv_freq) + offset
+        sinusoid_inp = torch.einsum('i , j -> i j', t, self.inv_freq)
+        emb = torch.cat((sinusoid_inp.sin(), sinusoid_inp.cos()), dim=-1)
+        return emb[None, :, :]
+
+
+# helpers
+
+def exists(val):
+    return val is not None
+
+
+def default(val, d):
+    if exists(val):
+        return val
+    return d() if isfunction(d) else d
+
+
+def always(val):
+    def inner(*args, **kwargs):
+        return val
+    return inner
+
+
+def not_equals(val):
+    def inner(x):
+        return x != val
+    return inner
+
+
+def equals(val):
+    def inner(x):
+        return x == val
+    return inner
+
+
+def max_neg_value(tensor):
+    return -torch.finfo(tensor.dtype).max
+
+
+# keyword argument helpers
+
+def pick_and_pop(keys, d):
+    values = list(map(lambda key: d.pop(key), keys))
+    return dict(zip(keys, values))
+
+
+def group_dict_by_key(cond, d):
+    return_val = [dict(), dict()]
+    for key in d.keys():
+        match = bool(cond(key))
+        ind = int(not match)
+        return_val[ind][key] = d[key]
+    return (*return_val,)
+
+
+def string_begins_with(prefix, str):
+    return str.startswith(prefix)
+
+
+def group_by_key_prefix(prefix, d):
+    return group_dict_by_key(partial(string_begins_with, prefix), d)
+
+
+def groupby_prefix_and_trim(prefix, d):
+    kwargs_with_prefix, kwargs = group_dict_by_key(partial(string_begins_with, prefix), d)
+    kwargs_without_prefix = dict(map(lambda x: (x[0][len(prefix):], x[1]), tuple(kwargs_with_prefix.items())))
+    return kwargs_without_prefix, kwargs
+
+
+# classes
+class Scale(nn.Module):
+    def __init__(self, value, fn):
+        super().__init__()
+        self.value = value
+        self.fn = fn
+
+    def forward(self, x, **kwargs):
+        x, *rest = self.fn(x, **kwargs)
+        return (x * self.value, *rest)
+
+
+class Rezero(nn.Module):
+    def __init__(self, fn):
+        super().__init__()
+        self.fn = fn
+        self.g = nn.Parameter(torch.zeros(1))
+
+    def forward(self, x, **kwargs):
+        x, *rest = self.fn(x, **kwargs)
+        return (x * self.g, *rest)
+
+
+class ScaleNorm(nn.Module):
+    def __init__(self, dim, eps=1e-5):
+        super().__init__()
+        self.scale = dim ** -0.5
+        self.eps = eps
+        self.g = nn.Parameter(torch.ones(1))
+
+    def forward(self, x):
+        norm = torch.norm(x, dim=-1, keepdim=True) * self.scale
+        return x / norm.clamp(min=self.eps) * self.g
+
+
+class RMSNorm(nn.Module):
+    def __init__(self, dim, eps=1e-8):
+        super().__init__()
+        self.scale = dim ** -0.5
+        self.eps = eps
+        self.g = nn.Parameter(torch.ones(dim))
+
+    def forward(self, x):
+        norm = torch.norm(x, dim=-1, keepdim=True) * self.scale
+        return x / norm.clamp(min=self.eps) * self.g
+
+
+class Residual(nn.Module):
+    def forward(self, x, residual):
+        return x + residual
+
+
+class GRUGating(nn.Module):
+    def __init__(self, dim):
+        super().__init__()
+        self.gru = nn.GRUCell(dim, dim)
+
+    def forward(self, x, residual):
+        gated_output = self.gru(
+            rearrange(x, 'b n d -> (b n) d'),
+            rearrange(residual, 'b n d -> (b n) d')
+        )
+
+        return gated_output.reshape_as(x)
+
+
+# feedforward
+
+class GEGLU(nn.Module):
+    def __init__(self, dim_in, dim_out):
+        super().__init__()
+        self.proj = nn.Linear(dim_in, dim_out * 2)
+
+    def forward(self, x):
+        x, gate = self.proj(x).chunk(2, dim=-1)
+        return x * F.gelu(gate)
+
+
+class FeedForward(nn.Module):
+    def __init__(self, dim, dim_out=None, mult=4, glu=False, dropout=0.):
+        super().__init__()
+        inner_dim = int(dim * mult)
+        dim_out = default(dim_out, dim)
+        project_in = nn.Sequential(
+            nn.Linear(dim, inner_dim),
+            nn.GELU()
+        ) if not glu else GEGLU(dim, inner_dim)
+
+        self.net = nn.Sequential(
+            project_in,
+            nn.Dropout(dropout),
+            nn.Linear(inner_dim, dim_out)
+        )
+
+    def forward(self, x):
+        return self.net(x)
+
+
+# attention.
+class Attention(nn.Module):
+    def __init__(
+            self,
+            dim,
+            dim_head=DEFAULT_DIM_HEAD,
+            heads=8,
+            causal=False,
+            mask=None,
+            talking_heads=False,
+            sparse_topk=None,
+            use_entmax15=False,
+            num_mem_kv=0,
+            dropout=0.,
+            on_attn=False
+    ):
+        super().__init__()
+        if use_entmax15:
+            raise NotImplementedError("Check out entmax activation instead of softmax activation!")
+        self.scale = dim_head ** -0.5
+        self.heads = heads
+        self.causal = causal
+        self.mask = mask
+
+        inner_dim = dim_head * heads
+
+        self.to_q = nn.Linear(dim, inner_dim, bias=False)
+        self.to_k = nn.Linear(dim, inner_dim, bias=False)
+        self.to_v = nn.Linear(dim, inner_dim, bias=False)
+        self.dropout = nn.Dropout(dropout)
+
+        # talking heads
+        self.talking_heads = talking_heads
+        if talking_heads:
+            self.pre_softmax_proj = nn.Parameter(torch.randn(heads, heads))
+            self.post_softmax_proj = nn.Parameter(torch.randn(heads, heads))
+
+        # explicit topk sparse attention
+        self.sparse_topk = sparse_topk
+
+        # entmax
+        #self.attn_fn = entmax15 if use_entmax15 else F.softmax
+        self.attn_fn = F.softmax
+
+        # add memory key / values
+        self.num_mem_kv = num_mem_kv
+        if num_mem_kv > 0:
+            self.mem_k = nn.Parameter(torch.randn(heads, num_mem_kv, dim_head))
+            self.mem_v = nn.Parameter(torch.randn(heads, num_mem_kv, dim_head))
+
+        # attention on attention
+        self.attn_on_attn = on_attn
+        self.to_out = nn.Sequential(nn.Linear(inner_dim, dim * 2), nn.GLU()) if on_attn else nn.Linear(inner_dim, dim)
+
+    def forward(
+            self,
+            x,
+            context=None,
+            mask=None,
+            context_mask=None,
+            rel_pos=None,
+            sinusoidal_emb=None,
+            prev_attn=None,
+            mem=None
+    ):
+        b, n, _, h, talking_heads, device = *x.shape, self.heads, self.talking_heads, x.device
+        kv_input = default(context, x)
+
+        q_input = x
+        k_input = kv_input
+        v_input = kv_input
+
+        if exists(mem):
+            k_input = torch.cat((mem, k_input), dim=-2)
+            v_input = torch.cat((mem, v_input), dim=-2)
+
+        if exists(sinusoidal_emb):
+            # in shortformer, the query would start at a position offset depending on the past cached memory
+            offset = k_input.shape[-2] - q_input.shape[-2]
+            q_input = q_input + sinusoidal_emb(q_input, offset=offset)
+            k_input = k_input + sinusoidal_emb(k_input)
+
+        q = self.to_q(q_input)
+        k = self.to_k(k_input)
+        v = self.to_v(v_input)
+
+        q, k, v = map(lambda t: rearrange(t, 'b n (h d) -> b h n d', h=h), (q, k, v))
+
+        input_mask = None
+        if any(map(exists, (mask, context_mask))):
+            q_mask = default(mask, lambda: torch.ones((b, n), device=device).bool())
+            k_mask = q_mask if not exists(context) else context_mask
+            k_mask = default(k_mask, lambda: torch.ones((b, k.shape[-2]), device=device).bool())
+            q_mask = rearrange(q_mask, 'b i -> b () i ()')
+            k_mask = rearrange(k_mask, 'b j -> b () () j')
+            input_mask = q_mask * k_mask
+
+        if self.num_mem_kv > 0:
+            mem_k, mem_v = map(lambda t: repeat(t, 'h n d -> b h n d', b=b), (self.mem_k, self.mem_v))
+            k = torch.cat((mem_k, k), dim=-2)
+            v = torch.cat((mem_v, v), dim=-2)
+            if exists(input_mask):
+                input_mask = F.pad(input_mask, (self.num_mem_kv, 0), value=True)
+
+        dots = einsum('b h i d, b h j d -> b h i j', q, k) * self.scale
+        mask_value = max_neg_value(dots)
+
+        if exists(prev_attn):
+            dots = dots + prev_attn
+
+        pre_softmax_attn = dots
+
+        if talking_heads:
+            dots = einsum('b h i j, h k -> b k i j', dots, self.pre_softmax_proj).contiguous()
+
+        if exists(rel_pos):
+            dots = rel_pos(dots)
+
+        if exists(input_mask):
+            dots.masked_fill_(~input_mask, mask_value)
+            del input_mask
+
+        if self.causal:
+            i, j = dots.shape[-2:]
+            r = torch.arange(i, device=device)
+            mask = rearrange(r, 'i -> () () i ()') < rearrange(r, 'j -> () () () j')
+            mask = F.pad(mask, (j - i, 0), value=False)
+            dots.masked_fill_(mask, mask_value)
+            del mask
+
+        if exists(self.sparse_topk) and self.sparse_topk < dots.shape[-1]:
+            top, _ = dots.topk(self.sparse_topk, dim=-1)
+            vk = top[..., -1].unsqueeze(-1).expand_as(dots)
+            mask = dots < vk
+            dots.masked_fill_(mask, mask_value)
+            del mask
+
+        attn = self.attn_fn(dots, dim=-1)
+        post_softmax_attn = attn
+
+        attn = self.dropout(attn)
+
+        if talking_heads:
+            attn = einsum('b h i j, h k -> b k i j', attn, self.post_softmax_proj).contiguous()
+
+        out = einsum('b h i j, b h j d -> b h i d', attn, v)
+        out = rearrange(out, 'b h n d -> b n (h d)')
+
+        intermediates = Intermediates(
+            pre_softmax_attn=pre_softmax_attn,
+            post_softmax_attn=post_softmax_attn
+        )
+
+        return self.to_out(out), intermediates
+
+
+class AttentionLayers(nn.Module):
+    def __init__(
+            self,
+            dim,
+            depth,
+            heads=8,
+            causal=False,
+            cross_attend=False,
+            only_cross=False,
+            use_scalenorm=False,
+            use_rmsnorm=False,
+            use_rezero=False,
+            rel_pos_num_buckets=32,
+            rel_pos_max_distance=128,
+            position_infused_attn=False,
+            custom_layers=None,
+            sandwich_coef=None,
+            par_ratio=None,
+            residual_attn=False,
+            cross_residual_attn=False,
+            macaron=False,
+            pre_norm=True,
+            gate_residual=False,
+            **kwargs
+    ):
+        super().__init__()
+        ff_kwargs, kwargs = groupby_prefix_and_trim('ff_', kwargs)
+        attn_kwargs, _ = groupby_prefix_and_trim('attn_', kwargs)
+
+        dim_head = attn_kwargs.get('dim_head', DEFAULT_DIM_HEAD)
+
+        self.dim = dim
+        self.depth = depth
+        self.layers = nn.ModuleList([])
+
+        self.has_pos_emb = position_infused_attn
+        self.pia_pos_emb = FixedPositionalEmbedding(dim) if position_infused_attn else None
+        self.rotary_pos_emb = always(None)
+
+        assert rel_pos_num_buckets <= rel_pos_max_distance, 'number of relative position buckets must be less than the relative position max distance'
+        self.rel_pos = None
+
+        self.pre_norm = pre_norm
+
+        self.residual_attn = residual_attn
+        self.cross_residual_attn = cross_residual_attn
+
+        norm_class = ScaleNorm if use_scalenorm else nn.LayerNorm
+        norm_class = RMSNorm if use_rmsnorm else norm_class
+        norm_fn = partial(norm_class, dim)
+
+        norm_fn = nn.Identity if use_rezero else norm_fn
+        branch_fn = Rezero if use_rezero else None
+
+        if cross_attend and not only_cross:
+            default_block = ('a', 'c', 'f')
+        elif cross_attend and only_cross:
+            default_block = ('c', 'f')
+        else:
+            default_block = ('a', 'f')
+
+        if macaron:
+            default_block = ('f',) + default_block
+
+        if exists(custom_layers):
+            layer_types = custom_layers
+        elif exists(par_ratio):
+            par_depth = depth * len(default_block)
+            assert 1 < par_ratio <= par_depth, 'par ratio out of range'
+            default_block = tuple(filter(not_equals('f'), default_block))
+            par_attn = par_depth // par_ratio
+            depth_cut = par_depth * 2 // 3  # 2 / 3 attention layer cutoff suggested by PAR paper
+            par_width = (depth_cut + depth_cut // par_attn) // par_attn
+            assert len(default_block) <= par_width, 'default block is too large for par_ratio'
+            par_block = default_block + ('f',) * (par_width - len(default_block))
+            par_head = par_block * par_attn
+            layer_types = par_head + ('f',) * (par_depth - len(par_head))
+        elif exists(sandwich_coef):
+            assert sandwich_coef > 0 and sandwich_coef <= depth, 'sandwich coefficient should be less than the depth'
+            layer_types = ('a',) * sandwich_coef + default_block * (depth - sandwich_coef) + ('f',) * sandwich_coef
+        else:
+            layer_types = default_block * depth
+
+        self.layer_types = layer_types
+        self.num_attn_layers = len(list(filter(equals('a'), layer_types)))
+
+        for layer_type in self.layer_types:
+            if layer_type == 'a':
+                layer = Attention(dim, heads=heads, causal=causal, **attn_kwargs)
+            elif layer_type == 'c':
+                layer = Attention(dim, heads=heads, **attn_kwargs)
+            elif layer_type == 'f':
+                layer = FeedForward(dim, **ff_kwargs)
+                layer = layer if not macaron else Scale(0.5, layer)
+            else:
+                raise Exception(f'invalid layer type {layer_type}')
+
+            if isinstance(layer, Attention) and exists(branch_fn):
+                layer = branch_fn(layer)
+
+            if gate_residual:
+                residual_fn = GRUGating(dim)
+            else:
+                residual_fn = Residual()
+
+            self.layers.append(nn.ModuleList([
+                norm_fn(),
+                layer,
+                residual_fn
+            ]))
+
+    def forward(
+            self,
+            x,
+            context=None,
+            mask=None,
+            context_mask=None,
+            mems=None,
+            return_hiddens=False
+    ):
+        hiddens = []
+        intermediates = []
+        prev_attn = None
+        prev_cross_attn = None
+
+        mems = mems.copy() if exists(mems) else [None] * self.num_attn_layers
+
+        for ind, (layer_type, (norm, block, residual_fn)) in enumerate(zip(self.layer_types, self.layers)):
+            is_last = ind == (len(self.layers) - 1)
+
+            if layer_type == 'a':
+                hiddens.append(x)
+                layer_mem = mems.pop(0)
+
+            residual = x
+
+            if self.pre_norm:
+                x = norm(x)
+
+            if layer_type == 'a':
+                out, inter = block(x, mask=mask, sinusoidal_emb=self.pia_pos_emb, rel_pos=self.rel_pos,
+                                   prev_attn=prev_attn, mem=layer_mem)
+            elif layer_type == 'c':
+                out, inter = block(x, context=context, mask=mask, context_mask=context_mask, prev_attn=prev_cross_attn)
+            elif layer_type == 'f':
+                out = block(x)
+
+            x = residual_fn(out, residual)
+
+            if layer_type in ('a', 'c'):
+                intermediates.append(inter)
+
+            if layer_type == 'a' and self.residual_attn:
+                prev_attn = inter.pre_softmax_attn
+            elif layer_type == 'c' and self.cross_residual_attn:
+                prev_cross_attn = inter.pre_softmax_attn
+
+            if not self.pre_norm and not is_last:
+                x = norm(x)
+
+        if return_hiddens:
+            intermediates = LayerIntermediates(
+                hiddens=hiddens,
+                attn_intermediates=intermediates
+            )
+
+            return x, intermediates
+
+        return x
+
+
+class Encoder(AttentionLayers):
+    def __init__(self, **kwargs):
+        assert 'causal' not in kwargs, 'cannot set causality on encoder'
+        super().__init__(causal=False, **kwargs)
+
+
+
+class TransformerWrapper(nn.Module):
+    def __init__(
+            self,
+            *,
+            num_tokens,
+            max_seq_len,
+            attn_layers,
+            emb_dim=None,
+            max_mem_len=0.,
+            emb_dropout=0.,
+            num_memory_tokens=None,
+            tie_embedding=False,
+            use_pos_emb=True
+    ):
+        super().__init__()
+        assert isinstance(attn_layers, AttentionLayers), 'attention layers must be one of Encoder or Decoder'
+
+        dim = attn_layers.dim
+        emb_dim = default(emb_dim, dim)
+
+        self.max_seq_len = max_seq_len
+        self.max_mem_len = max_mem_len
+        self.num_tokens = num_tokens
+
+        self.token_emb = nn.Embedding(num_tokens, emb_dim)
+        self.pos_emb = AbsolutePositionalEmbedding(emb_dim, max_seq_len) if (
+                    use_pos_emb and not attn_layers.has_pos_emb) else always(0)
+        self.emb_dropout = nn.Dropout(emb_dropout)
+
+        self.project_emb = nn.Linear(emb_dim, dim) if emb_dim != dim else nn.Identity()
+        self.attn_layers = attn_layers
+        self.norm = nn.LayerNorm(dim)
+
+        self.init_()
+
+        self.to_logits = nn.Linear(dim, num_tokens) if not tie_embedding else lambda t: t @ self.token_emb.weight.t()
+
+        # memory tokens (like [cls]) from Memory Transformers paper
+        num_memory_tokens = default(num_memory_tokens, 0)
+        self.num_memory_tokens = num_memory_tokens
+        if num_memory_tokens > 0:
+            self.memory_tokens = nn.Parameter(torch.randn(num_memory_tokens, dim))
+
+            # let funnel encoder know number of memory tokens, if specified
+            if hasattr(attn_layers, 'num_memory_tokens'):
+                attn_layers.num_memory_tokens = num_memory_tokens
+
+    def init_(self):
+        nn.init.normal_(self.token_emb.weight, std=0.02)
+
+    def forward(
+            self,
+            x,
+            return_embeddings=False,
+            mask=None,
+            return_mems=False,
+            return_attn=False,
+            mems=None,
+            **kwargs
+    ):
+        b, n, device, num_mem = *x.shape, x.device, self.num_memory_tokens
+        x = self.token_emb(x)
+        x += self.pos_emb(x)
+        x = self.emb_dropout(x)
+
+        x = self.project_emb(x)
+
+        if num_mem > 0:
+            mem = repeat(self.memory_tokens, 'n d -> b n d', b=b)
+            x = torch.cat((mem, x), dim=1)
+
+            # auto-handle masking after appending memory tokens
+            if exists(mask):
+                mask = F.pad(mask, (num_mem, 0), value=True)
+
+        x, intermediates = self.attn_layers(x, mask=mask, mems=mems, return_hiddens=True, **kwargs)
+        x = self.norm(x)
+
+        mem, x = x[:, :num_mem], x[:, num_mem:]
+
+        out = self.to_logits(x) if not return_embeddings else x
+
+        if return_mems:
+            hiddens = intermediates.hiddens
+            new_mems = list(map(lambda pair: torch.cat(pair, dim=-2), zip(mems, hiddens))) if exists(mems) else hiddens
+            new_mems = list(map(lambda t: t[..., -self.max_mem_len:, :].detach(), new_mems))
+            return out, new_mems
+
+        if return_attn:
+            attn_maps = list(map(lambda t: t.post_softmax_attn, intermediates.attn_intermediates))
+            return out, attn_maps
+
+        return out
+

ldm/thirdp/psp/helpers.py

@@ -0,0 +1,121 @@
+# https://github.com/eladrich/pixel2style2pixel
+
+from collections import namedtuple
+import torch
+from torch.nn import Conv2d, BatchNorm2d, PReLU, ReLU, Sigmoid, MaxPool2d, AdaptiveAvgPool2d, Sequential, Module
+
+"""
+ArcFace implementation from [TreB1eN](https://github.com/TreB1eN/InsightFace_Pytorch)
+"""
+
+
+class Flatten(Module):
+	def forward(self, input):
+		return input.view(input.size(0), -1)
+
+
+def l2_norm(input, axis=1):
+	norm = torch.norm(input, 2, axis, True)
+	output = torch.div(input, norm)
+	return output
+
+
+class Bottleneck(namedtuple('Block', ['in_channel', 'depth', 'stride'])):
+	""" A named tuple describing a ResNet block. """
+
+
+def get_block(in_channel, depth, num_units, stride=2):
+	return [Bottleneck(in_channel, depth, stride)] + [Bottleneck(depth, depth, 1) for i in range(num_units - 1)]
+
+
+def get_blocks(num_layers):
+	if num_layers == 50:
+		blocks = [
+			get_block(in_channel=64, depth=64, num_units=3),
+			get_block(in_channel=64, depth=128, num_units=4),
+			get_block(in_channel=128, depth=256, num_units=14),
+			get_block(in_channel=256, depth=512, num_units=3)
+		]
+	elif num_layers == 100:
+		blocks = [
+			get_block(in_channel=64, depth=64, num_units=3),
+			get_block(in_channel=64, depth=128, num_units=13),
+			get_block(in_channel=128, depth=256, num_units=30),
+			get_block(in_channel=256, depth=512, num_units=3)
+		]
+	elif num_layers == 152:
+		blocks = [
+			get_block(in_channel=64, depth=64, num_units=3),
+			get_block(in_channel=64, depth=128, num_units=8),
+			get_block(in_channel=128, depth=256, num_units=36),
+			get_block(in_channel=256, depth=512, num_units=3)
+		]
+	else:
+		raise ValueError("Invalid number of layers: {}. Must be one of [50, 100, 152]".format(num_layers))
+	return blocks
+
+
+class SEModule(Module):
+	def __init__(self, channels, reduction):
+		super(SEModule, self).__init__()
+		self.avg_pool = AdaptiveAvgPool2d(1)
+		self.fc1 = Conv2d(channels, channels // reduction, kernel_size=1, padding=0, bias=False)
+		self.relu = ReLU(inplace=True)
+		self.fc2 = Conv2d(channels // reduction, channels, kernel_size=1, padding=0, bias=False)
+		self.sigmoid = Sigmoid()
+
+	def forward(self, x):
+		module_input = x
+		x = self.avg_pool(x)
+		x = self.fc1(x)
+		x = self.relu(x)
+		x = self.fc2(x)
+		x = self.sigmoid(x)
+		return module_input * x
+
+
+class bottleneck_IR(Module):
+	def __init__(self, in_channel, depth, stride):
+		super(bottleneck_IR, self).__init__()
+		if in_channel == depth:
+			self.shortcut_layer = MaxPool2d(1, stride)
+		else:
+			self.shortcut_layer = Sequential(
+				Conv2d(in_channel, depth, (1, 1), stride, bias=False),
+				BatchNorm2d(depth)
+			)
+		self.res_layer = Sequential(
+			BatchNorm2d(in_channel),
+			Conv2d(in_channel, depth, (3, 3), (1, 1), 1, bias=False), PReLU(depth),
+			Conv2d(depth, depth, (3, 3), stride, 1, bias=False), BatchNorm2d(depth)
+		)
+
+	def forward(self, x):
+		shortcut = self.shortcut_layer(x)
+		res = self.res_layer(x)
+		return res + shortcut
+
+
+class bottleneck_IR_SE(Module):
+	def __init__(self, in_channel, depth, stride):
+		super(bottleneck_IR_SE, self).__init__()
+		if in_channel == depth:
+			self.shortcut_layer = MaxPool2d(1, stride)
+		else:
+			self.shortcut_layer = Sequential(
+				Conv2d(in_channel, depth, (1, 1), stride, bias=False),
+				BatchNorm2d(depth)
+			)
+		self.res_layer = Sequential(
+			BatchNorm2d(in_channel),
+			Conv2d(in_channel, depth, (3, 3), (1, 1), 1, bias=False),
+			PReLU(depth),
+			Conv2d(depth, depth, (3, 3), stride, 1, bias=False),
+			BatchNorm2d(depth),
+			SEModule(depth, 16)
+		)
+
+	def forward(self, x):
+		shortcut = self.shortcut_layer(x)
+		res = self.res_layer(x)
+		return res + shortcut

ldm/thirdp/psp/id_loss.py

@@ -0,0 +1,23 @@
+# https://github.com/eladrich/pixel2style2pixel
+import torch
+from torch import nn
+from ldm.thirdp.psp.model_irse import Backbone
+
+
+class IDFeatures(nn.Module):
+    def __init__(self, model_path):
+        super(IDFeatures, self).__init__()
+        print('Loading ResNet ArcFace')
+        self.facenet = Backbone(input_size=112, num_layers=50, drop_ratio=0.6, mode='ir_se')
+        self.facenet.load_state_dict(torch.load(model_path, map_location="cpu"))
+        self.face_pool = torch.nn.AdaptiveAvgPool2d((112, 112))
+        self.facenet.eval()
+
+    def forward(self, x, crop=False):
+        # Not sure of the image range here
+        if crop:
+            x = torch.nn.functional.interpolate(x, (256, 256), mode="area")
+            x = x[:, :, 35:223, 32:220]
+        x = self.face_pool(x)
+        x_feats = self.facenet(x)
+        return x_feats

ldm/thirdp/psp/model_irse.py

@@ -0,0 +1,86 @@
+# https://github.com/eladrich/pixel2style2pixel
+
+from torch.nn import Linear, Conv2d, BatchNorm1d, BatchNorm2d, PReLU, Dropout, Sequential, Module
+from ldm.thirdp.psp.helpers import get_blocks, Flatten, bottleneck_IR, bottleneck_IR_SE, l2_norm
+
+"""
+Modified Backbone implementation from [TreB1eN](https://github.com/TreB1eN/InsightFace_Pytorch)
+"""
+
+
+class Backbone(Module):
+	def __init__(self, input_size, num_layers, mode='ir', drop_ratio=0.4, affine=True):
+		super(Backbone, self).__init__()
+		assert input_size in [112, 224], "input_size should be 112 or 224"
+		assert num_layers in [50, 100, 152], "num_layers should be 50, 100 or 152"
+		assert mode in ['ir', 'ir_se'], "mode should be ir or ir_se"
+		blocks = get_blocks(num_layers)
+		if mode == 'ir':
+			unit_module = bottleneck_IR
+		elif mode == 'ir_se':
+			unit_module = bottleneck_IR_SE
+		self.input_layer = Sequential(Conv2d(3, 64, (3, 3), 1, 1, bias=False),
+									  BatchNorm2d(64),
+									  PReLU(64))
+		if input_size == 112:
+			self.output_layer = Sequential(BatchNorm2d(512),
+			                               Dropout(drop_ratio),
+			                               Flatten(),
+			                               Linear(512 * 7 * 7, 512),
+			                               BatchNorm1d(512, affine=affine))
+		else:
+			self.output_layer = Sequential(BatchNorm2d(512),
+			                               Dropout(drop_ratio),
+			                               Flatten(),
+			                               Linear(512 * 14 * 14, 512),
+			                               BatchNorm1d(512, affine=affine))
+
+		modules = []
+		for block in blocks:
+			for bottleneck in block:
+				modules.append(unit_module(bottleneck.in_channel,
+										   bottleneck.depth,
+										   bottleneck.stride))
+		self.body = Sequential(*modules)
+
+	def forward(self, x):
+		x = self.input_layer(x)
+		x = self.body(x)
+		x = self.output_layer(x)
+		return l2_norm(x)
+
+
+def IR_50(input_size):
+	"""Constructs a ir-50 model."""
+	model = Backbone(input_size, num_layers=50, mode='ir', drop_ratio=0.4, affine=False)
+	return model
+
+
+def IR_101(input_size):
+	"""Constructs a ir-101 model."""
+	model = Backbone(input_size, num_layers=100, mode='ir', drop_ratio=0.4, affine=False)
+	return model
+
+
+def IR_152(input_size):
+	"""Constructs a ir-152 model."""
+	model = Backbone(input_size, num_layers=152, mode='ir', drop_ratio=0.4, affine=False)
+	return model
+
+
+def IR_SE_50(input_size):
+	"""Constructs a ir_se-50 model."""
+	model = Backbone(input_size, num_layers=50, mode='ir_se', drop_ratio=0.4, affine=False)
+	return model
+
+
+def IR_SE_101(input_size):
+	"""Constructs a ir_se-101 model."""
+	model = Backbone(input_size, num_layers=100, mode='ir_se', drop_ratio=0.4, affine=False)
+	return model
+
+
+def IR_SE_152(input_size):
+	"""Constructs a ir_se-152 model."""
+	model = Backbone(input_size, num_layers=152, mode='ir_se', drop_ratio=0.4, affine=False)
+	return model

ldm/util.py

@@ -0,0 +1,302 @@
+import importlib
+
+import torchvision
+import torch
+from torch import optim
+import numpy as np
+
+from inspect import isfunction
+from PIL import Image, ImageDraw, ImageFont
+
+import os
+import numpy as np
+import matplotlib.pyplot as plt
+from PIL import Image
+import torch
+import time
+import cv2
+import PIL
+
+def pil_rectangle_crop(im):
+    width, height = im.size   # Get dimensions
+    
+    if width <= height:
+        left = 0
+        right = width
+        top = (height - width)/2
+        bottom = (height + width)/2
+    else:
+        
+        top = 0
+        bottom = height
+        left = (width - height) / 2
+        bottom = (width + height) / 2
+
+    # Crop the center of the image
+    im = im.crop((left, top, right, bottom))
+    return im
+
+def add_margin(pil_img, color=0, size=256):
+    width, height = pil_img.size
+    result = Image.new(pil_img.mode, (size, size), color)
+    result.paste(pil_img, ((size - width) // 2, (size - height) // 2))
+    return result
+
+
+def create_carvekit_interface():
+    from carvekit.api.high import HiInterface
+    # Check doc strings for more information
+    interface = HiInterface(object_type="object",  # Can be "object" or "hairs-like".
+                            batch_size_seg=5,
+                            batch_size_matting=1,
+                            device='cuda' if torch.cuda.is_available() else 'cpu',
+                            seg_mask_size=640,  # Use 640 for Tracer B7 and 320 for U2Net
+                            matting_mask_size=2048,
+                            trimap_prob_threshold=231,
+                            trimap_dilation=30,
+                            trimap_erosion_iters=5,
+                            fp16=False)
+
+    return interface
+
+
+def load_and_preprocess(interface, input_im):
+    '''
+    :param input_im (PIL Image).
+    :return image (H, W, 3) array in [0, 1].
+    '''
+    # See https://github.com/Ir1d/image-background-remove-tool
+    image = input_im.convert('RGB')
+
+    image_without_background = interface([image])[0]
+    image_without_background = np.array(image_without_background)
+    est_seg = image_without_background > 127
+    image = np.array(image)
+    foreground = est_seg[:, : , -1].astype(np.bool_)
+    image[~foreground] = [255., 255., 255.]
+    x, y, w, h = cv2.boundingRect(foreground.astype(np.uint8))
+    image = image[y:y+h, x:x+w, :]
+    image = PIL.Image.fromarray(np.array(image))
+    
+    # resize image such that long edge is 512
+    image.thumbnail([200, 200], Image.LANCZOS)
+    image = add_margin(image, (255, 255, 255), size=256)
+    image = np.array(image)
+    
+    return image
+
+
+def log_txt_as_img(wh, xc, size=10):
+    # wh a tuple of (width, height)
+    # xc a list of captions to plot
+    b = len(xc)
+    txts = list()
+    for bi in range(b):
+        txt = Image.new("RGB", wh, color="white")
+        draw = ImageDraw.Draw(txt)
+        font = ImageFont.truetype('data/DejaVuSans.ttf', size=size)
+        nc = int(40 * (wh[0] / 256))
+        lines = "\n".join(xc[bi][start:start + nc] for start in range(0, len(xc[bi]), nc))
+
+        try:
+            draw.text((0, 0), lines, fill="black", font=font)
+        except UnicodeEncodeError:
+            print("Cant encode string for logging. Skipping.")
+
+        txt = np.array(txt).transpose(2, 0, 1) / 127.5 - 1.0
+        txts.append(txt)
+    txts = np.stack(txts)
+    txts = torch.tensor(txts)
+    return txts
+
+
+def ismap(x):
+    if not isinstance(x, torch.Tensor):
+        return False
+    return (len(x.shape) == 4) and (x.shape[1] > 3)
+
+
+def isimage(x):
+    if not isinstance(x,torch.Tensor):
+        return False
+    return (len(x.shape) == 4) and (x.shape[1] == 3 or x.shape[1] == 1)
+
+
+def exists(x):
+    return x is not None
+
+
+def default(val, d):
+    if exists(val):
+        return val
+    return d() if isfunction(d) else d
+
+
+def mean_flat(tensor):
+    """
+    https://github.com/openai/guided-diffusion/blob/27c20a8fab9cb472df5d6bdd6c8d11c8f430b924/guided_diffusion/nn.py#L86
+    Take the mean over all non-batch dimensions.
+    """
+    return tensor.mean(dim=list(range(1, len(tensor.shape))))
+
+
+def count_params(model, verbose=False):
+    total_params = sum(p.numel() for p in model.parameters())
+    if verbose:
+        print(f"{model.__class__.__name__} has {total_params*1.e-6:.2f} M params.")
+    return total_params
+
+
+def instantiate_from_config(config):
+    if not "target" in config:
+        if config == '__is_first_stage__':
+            return None
+        elif config == "__is_unconditional__":
+            return None
+        raise KeyError("Expected key `target` to instantiate.")
+    return get_obj_from_str(config["target"])(**config.get("params", dict()))
+
+
+def get_obj_from_str(string, reload=False):
+    module, cls = string.rsplit(".", 1)
+    if reload:
+        module_imp = importlib.import_module(module)
+        importlib.reload(module_imp)
+    return getattr(importlib.import_module(module, package=None), cls)
+
+
+class AdamWwithEMAandWings(optim.Optimizer):
+    # credit to https://gist.github.com/crowsonkb/65f7265353f403714fce3b2595e0b298
+    def __init__(self, params, lr=1.e-3, betas=(0.9, 0.999), eps=1.e-8,  # TODO: check hyperparameters before using
+                 weight_decay=1.e-2, amsgrad=False, ema_decay=0.9999,   # ema decay to match previous code
+                 ema_power=1., param_names=()):
+        """AdamW that saves EMA versions of the parameters."""
+        if not 0.0 <= lr:
+            raise ValueError("Invalid learning rate: {}".format(lr))
+        if not 0.0 <= eps:
+            raise ValueError("Invalid epsilon value: {}".format(eps))
+        if not 0.0 <= betas[0] < 1.0:
+            raise ValueError("Invalid beta parameter at index 0: {}".format(betas[0]))
+        if not 0.0 <= betas[1] < 1.0:
+            raise ValueError("Invalid beta parameter at index 1: {}".format(betas[1]))
+        if not 0.0 <= weight_decay:
+            raise ValueError("Invalid weight_decay value: {}".format(weight_decay))
+        if not 0.0 <= ema_decay <= 1.0:
+            raise ValueError("Invalid ema_decay value: {}".format(ema_decay))
+        defaults = dict(lr=lr, betas=betas, eps=eps,
+                        weight_decay=weight_decay, amsgrad=amsgrad, ema_decay=ema_decay,
+                        ema_power=ema_power, param_names=param_names)
+        super().__init__(params, defaults)
+
+    def __setstate__(self, state):
+        super().__setstate__(state)
+        for group in self.param_groups:
+            group.setdefault('amsgrad', False)
+
+    @torch.no_grad()
+    def step(self, closure=None):
+        """Performs a single optimization step.
+        Args:
+            closure (callable, optional): A closure that reevaluates the model
+                and returns the loss.
+        """
+        loss = None
+        if closure is not None:
+            with torch.enable_grad():
+                loss = closure()
+
+        for group in self.param_groups:
+            params_with_grad = []
+            grads = []
+            exp_avgs = []
+            exp_avg_sqs = []
+            ema_params_with_grad = []
+            state_sums = []
+            max_exp_avg_sqs = []
+            state_steps = []
+            amsgrad = group['amsgrad']
+            beta1, beta2 = group['betas']
+            ema_decay = group['ema_decay']
+            ema_power = group['ema_power']
+
+            for p in group['params']:
+                if p.grad is None:
+                    continue
+                params_with_grad.append(p)
+                if p.grad.is_sparse:
+                    raise RuntimeError('AdamW does not support sparse gradients')
+                grads.append(p.grad)
+
+                state = self.state[p]
+
+                # State initialization
+                if len(state) == 0:
+                    state['step'] = 0
+                    # Exponential moving average of gradient values
+                    state['exp_avg'] = torch.zeros_like(p, memory_format=torch.preserve_format)
+                    # Exponential moving average of squared gradient values
+                    state['exp_avg_sq'] = torch.zeros_like(p, memory_format=torch.preserve_format)
+                    if amsgrad:
+                        # Maintains max of all exp. moving avg. of sq. grad. values
+                        state['max_exp_avg_sq'] = torch.zeros_like(p, memory_format=torch.preserve_format)
+                    # Exponential moving average of parameter values
+                    state['param_exp_avg'] = p.detach().float().clone()
+
+                exp_avgs.append(state['exp_avg'])
+                exp_avg_sqs.append(state['exp_avg_sq'])
+                ema_params_with_grad.append(state['param_exp_avg'])
+
+                if amsgrad:
+                    max_exp_avg_sqs.append(state['max_exp_avg_sq'])
+
+                # update the steps for each param group update
+                state['step'] += 1
+                # record the step after step update
+                state_steps.append(state['step'])
+
+            optim._functional.adamw(params_with_grad,
+                    grads,
+                    exp_avgs,
+                    exp_avg_sqs,
+                    max_exp_avg_sqs,
+                    state_steps,
+                    amsgrad=amsgrad,
+                    beta1=beta1,
+                    beta2=beta2,
+                    lr=group['lr'],
+                    weight_decay=group['weight_decay'],
+                    eps=group['eps'],
+                    maximize=False)
+
+            cur_ema_decay = min(ema_decay, 1 - state['step'] ** -ema_power)
+            for param, ema_param in zip(params_with_grad, ema_params_with_grad):
+                ema_param.mul_(cur_ema_decay).add_(param.float(), alpha=1 - cur_ema_decay)
+
+        return loss
+
+def prepare_inputs(image_path, elevation_input, crop_size=-1, image_size=256):
+    image_input = Image.open(image_path)
+
+    if crop_size!=-1:
+        alpha_np = np.asarray(image_input)[:, :, 3]
+        coords = np.stack(np.nonzero(alpha_np), 1)[:, (1, 0)]
+        min_x, min_y = np.min(coords, 0)
+        max_x, max_y = np.max(coords, 0)
+        ref_img_ = image_input.crop((min_x, min_y, max_x, max_y))
+        h, w = ref_img_.height, ref_img_.width
+        scale = crop_size / max(h, w)
+        h_, w_ = int(scale * h), int(scale * w)
+        ref_img_ = ref_img_.resize((w_, h_), resample=Image.BICUBIC)
+        image_input = add_margin(ref_img_, size=image_size)
+    else:
+        image_input = add_margin(image_input, size=max(image_input.height, image_input.width))
+        image_input = image_input.resize((image_size, image_size), resample=Image.BICUBIC)
+
+    image_input = np.asarray(image_input)
+    image_input = image_input.astype(np.float32) / 255.0
+    ref_mask = image_input[:, :, 3:]
+    image_input[:, :, :3] = image_input[:, :, :3] * ref_mask + 1 - ref_mask  # white background
+    image_input = image_input[:, :, :3] * 2.0 - 1.0
+    image_input = torch.from_numpy(image_input.astype(np.float32))
+    elevation_input = torch.from_numpy(np.asarray([np.deg2rad(elevation_input)], np.float32))
+    return {"input_image": image_input, "input_elevation": elevation_input}

meta_info/camera-16.pkl

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:d46537ff53982fd57a7b987673cd759e3a892f11b9f7ee44566f5612d6da6357
+size 2142