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import sys
import torch
import numpy as np
import streamlit as st
from PIL import Image
from omegaconf import OmegaConf
from einops import repeat, rearrange
from pytorch_lightning import seed_everything
from imwatermark import WatermarkEncoder
from scripts.txt2img import put_watermark
from ldm.models.diffusion.ddim import DDIMSampler
from ldm.models.diffusion.ddpm import LatentUpscaleDiffusion, LatentUpscaleFinetuneDiffusion
from ldm.util import exists, instantiate_from_config
torch.set_grad_enabled(False)
@st.cache(allow_output_mutation=True)
def initialize_model(config, ckpt):
config = OmegaConf.load(config)
model = instantiate_from_config(config.model)
model.load_state_dict(torch.load(ckpt)["state_dict"], strict=False)
device = torch.device("cuda") if torch.cuda.is_available() else torch.device("cpu")
model = model.to(device)
sampler = DDIMSampler(model)
return sampler
def make_batch_sd(
image,
txt,
device,
num_samples=1,
):
image = np.array(image.convert("RGB"))
image = torch.from_numpy(image).to(dtype=torch.float32) / 127.5 - 1.0
batch = {
"lr": rearrange(image, 'h w c -> 1 c h w'),
"txt": num_samples * [txt],
}
batch["lr"] = repeat(batch["lr"].to(device=device), "1 ... -> n ...", n=num_samples)
return batch
def make_noise_augmentation(model, batch, noise_level=None):
x_low = batch[model.low_scale_key]
x_low = x_low.to(memory_format=torch.contiguous_format).float()
x_aug, noise_level = model.low_scale_model(x_low, noise_level)
return x_aug, noise_level
def paint(sampler, image, prompt, seed, scale, h, w, steps, num_samples=1, callback=None, eta=0., noise_level=None):
device = torch.device("cuda") if torch.cuda.is_available() else torch.device("cpu")
model = sampler.model
seed_everything(seed)
prng = np.random.RandomState(seed)
start_code = prng.randn(num_samples, model.channels, h , w)
start_code = torch.from_numpy(start_code).to(device=device, dtype=torch.float32)
print("Creating invisible watermark encoder (see https://github.com/ShieldMnt/invisible-watermark)...")
wm = "SDV2"
wm_encoder = WatermarkEncoder()
wm_encoder.set_watermark('bytes', wm.encode('utf-8'))
with torch.no_grad(),\
torch.autocast("cuda"):
batch = make_batch_sd(image, txt=prompt, device=device, num_samples=num_samples)
c = model.cond_stage_model.encode(batch["txt"])
c_cat = list()
if isinstance(model, LatentUpscaleFinetuneDiffusion):
for ck in model.concat_keys:
cc = batch[ck]
if exists(model.reshuffle_patch_size):
assert isinstance(model.reshuffle_patch_size, int)
cc = rearrange(cc, 'b c (p1 h) (p2 w) -> b (p1 p2 c) h w',
p1=model.reshuffle_patch_size, p2=model.reshuffle_patch_size)
c_cat.append(cc)
c_cat = torch.cat(c_cat, dim=1)
# cond
cond = {"c_concat": [c_cat], "c_crossattn": [c]}
# uncond cond
uc_cross = model.get_unconditional_conditioning(num_samples, "")
uc_full = {"c_concat": [c_cat], "c_crossattn": [uc_cross]}
elif isinstance(model, LatentUpscaleDiffusion):
x_augment, noise_level = make_noise_augmentation(model, batch, noise_level)
cond = {"c_concat": [x_augment], "c_crossattn": [c], "c_adm": noise_level}
# uncond cond
uc_cross = model.get_unconditional_conditioning(num_samples, "")
uc_full = {"c_concat": [x_augment], "c_crossattn": [uc_cross], "c_adm": noise_level}
else:
raise NotImplementedError()
shape = [model.channels, h, w]
samples, intermediates = sampler.sample(
steps,
num_samples,
shape,
cond,
verbose=False,
eta=eta,
unconditional_guidance_scale=scale,
unconditional_conditioning=uc_full,
x_T=start_code,
callback=callback
)
with torch.no_grad():
x_samples_ddim = model.decode_first_stage(samples)
result = torch.clamp((x_samples_ddim + 1.0) / 2.0, min=0.0, max=1.0)
result = result.cpu().numpy().transpose(0, 2, 3, 1) * 255
st.text(f"upscaled image shape: {result.shape}")
return [put_watermark(Image.fromarray(img.astype(np.uint8)), wm_encoder) for img in result]
def run():
st.title("Stable Diffusion Upscaling")
# run via streamlit run scripts/demo/depth2img.py <path-tp-config> <path-to-ckpt>
sampler = initialize_model(sys.argv[1], sys.argv[2])
image = st.file_uploader("Image", ["jpg", "png"])
if image:
image = Image.open(image)
w, h = image.size
st.text(f"loaded input image of size ({w}, {h})")
width, height = map(lambda x: x - x % 64, (w, h)) # resize to integer multiple of 64
image = image.resize((width, height))
st.text(f"resized input image to size ({width}, {height} (w, h))")
st.image(image)
st.write(f"\n Tip: Add a description of the object that should be upscaled, e.g.: 'a professional photograph of a cat'")
prompt = st.text_input("Prompt", "a high quality professional photograph")
seed = st.number_input("Seed", min_value=0, max_value=1000000, value=0)
num_samples = st.number_input("Number of Samples", min_value=1, max_value=64, value=1)
scale = st.slider("Scale", min_value=0.1, max_value=30.0, value=9.0, step=0.1)
steps = st.slider("DDIM Steps", min_value=2, max_value=250, value=50, step=1)
eta = st.sidebar.number_input("eta (DDIM)", value=0., min_value=0., max_value=1.)
noise_level = None
if isinstance(sampler.model, LatentUpscaleDiffusion):
# TODO: make this work for all models
noise_level = st.sidebar.number_input("Noise Augmentation", min_value=0, max_value=350, value=20)
noise_level = torch.Tensor(num_samples * [noise_level]).to(sampler.model.device).long()
t_progress = st.progress(0)
def t_callback(t):
t_progress.progress(min((t + 1) / steps, 1.))
sampler.make_schedule(steps, ddim_eta=eta, verbose=True)
if st.button("Sample"):
result = paint(
sampler=sampler,
image=image,
prompt=prompt,
seed=seed,
scale=scale,
h=height, w=width, steps=steps,
num_samples=num_samples,
callback=t_callback,
noise_level=noise_level,
eta=eta
)
st.write("Result")
for image in result:
st.image(image, output_format='PNG')
if __name__ == "__main__":
run()
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