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import os
import torch
import collections
import torch.nn as nn
from functools import partial
from transformers import CLIPTextModel, CLIPTokenizer, logging
from diffusers import AutoencoderKL, PNDMScheduler, EulerDiscreteScheduler, DPMSolverMultistepScheduler
from models.unet_2d_condition import UNet2DConditionModel
# suppress partial model loading warning
logging.set_verbosity_error()
class RegionDiffusion(nn.Module):
def __init__(self, device):
super().__init__()
self.device = device
self.num_train_timesteps = 1000
self.clip_gradient = False
print(f'[INFO] loading stable diffusion...')
model_id = 'runwayml/stable-diffusion-v1-5'
self.vae = AutoencoderKL.from_pretrained(
model_id, subfolder="vae").to(self.device)
self.tokenizer = CLIPTokenizer.from_pretrained(
model_id, subfolder='tokenizer')
self.text_encoder = CLIPTextModel.from_pretrained(
model_id, subfolder='text_encoder').to(self.device)
self.unet = UNet2DConditionModel.from_pretrained(
model_id, subfolder="unet").to(self.device)
self.scheduler = PNDMScheduler(beta_start=0.00085, beta_end=0.012, beta_schedule="scaled_linear",
num_train_timesteps=self.num_train_timesteps, skip_prk_steps=True, steps_offset=1)
self.alphas_cumprod = self.scheduler.alphas_cumprod.to(self.device)
self.masks = []
self.attention_maps = None
self.color_loss = torch.nn.functional.mse_loss
print(f'[INFO] loaded stable diffusion!')
def get_text_embeds(self, prompt, negative_prompt):
# prompt, negative_prompt: [str]
# Tokenize text and get embeddings
text_input = self.tokenizer(
prompt, padding='max_length', max_length=self.tokenizer.model_max_length, truncation=True, return_tensors='pt')
with torch.no_grad():
text_embeddings = self.text_encoder(
text_input.input_ids.to(self.device))[0]
# Do the same for unconditional embeddings
uncond_input = self.tokenizer(negative_prompt, padding='max_length',
max_length=self.tokenizer.model_max_length, return_tensors='pt')
with torch.no_grad():
uncond_embeddings = self.text_encoder(
uncond_input.input_ids.to(self.device))[0]
# Cat for final embeddings
text_embeddings = torch.cat([uncond_embeddings, text_embeddings])
return text_embeddings
def get_text_embeds_list(self, prompts):
# prompts: [list]
text_embeddings = []
for prompt in prompts:
# Tokenize text and get embeddings
text_input = self.tokenizer(
[prompt], padding='max_length', max_length=self.tokenizer.model_max_length, truncation=True, return_tensors='pt')
with torch.no_grad():
text_embeddings.append(self.text_encoder(
text_input.input_ids.to(self.device))[0])
return text_embeddings
def produce_latents(self, text_embeddings, height=512, width=512, num_inference_steps=50, guidance_scale=7.5,
latents=None, use_grad_guidance=False, text_format_dict={}):
if latents is None:
latents = torch.randn(
(1, self.unet.in_channels, height // 8, width // 8), device=self.device)
self.scheduler.set_timesteps(num_inference_steps)
n_styles = text_embeddings.shape[0]-1
assert n_styles == len(self.masks)
with torch.autocast('cuda'):
for i, t in enumerate(self.scheduler.timesteps):
# predict the noise residual
with torch.no_grad():
noise_pred_uncond = self.unet(latents, t, encoder_hidden_states=text_embeddings[:1],
text_format_dict={})['sample']
noise_pred_text = None
for style_i, mask in enumerate(self.masks):
if style_i < len(self.masks) - 1:
masked_latent = latents
noise_pred_text_cur = self.unet(masked_latent, t, encoder_hidden_states=text_embeddings[style_i+1:style_i+2],
text_format_dict={})['sample']
else:
noise_pred_text_cur = self.unet(latents, t, encoder_hidden_states=text_embeddings[style_i+1:style_i+2],
text_format_dict=text_format_dict)['sample']
if noise_pred_text is None:
noise_pred_text = noise_pred_text_cur * mask
else:
noise_pred_text = noise_pred_text + noise_pred_text_cur*mask
# perform classifier-free guidance
noise_pred = noise_pred_uncond + guidance_scale * \
(noise_pred_text - noise_pred_uncond)
# compute the previous noisy sample x_t -> x_t-1
latents = self.scheduler.step(noise_pred, t, latents)[
'prev_sample']
# apply gradient guidance
if use_grad_guidance and t < text_format_dict['guidance_start_step']:
with torch.enable_grad():
if not latents.requires_grad:
latents.requires_grad = True
latents_0 = self.predict_x0(latents, noise_pred, t)
latents_inp = 1 / 0.18215 * latents_0
imgs = self.vae.decode(latents_inp).sample
imgs = (imgs / 2 + 0.5).clamp(0, 1)
loss_total = 0.
for attn_map, rgb_val in zip(text_format_dict['color_obj_atten'], text_format_dict['target_RGB']):
avg_rgb = (
imgs*attn_map[:, 0]).sum(2).sum(2)/attn_map[:, 0].sum()
loss = self.color_loss(
avg_rgb, rgb_val[:, :, 0, 0])*100
# print(loss)
loss_total += loss
loss_total.backward()
latents = (
latents - latents.grad * text_format_dict['color_guidance_weight']).detach().clone()
return latents
def predict_x0(self, x_t, eps_t, t):
alpha_t = self.scheduler.alphas_cumprod[t]
return (x_t - eps_t * torch.sqrt(1-alpha_t)) / torch.sqrt(alpha_t)
def produce_attn_maps(self, prompts, negative_prompts='', height=512, width=512, num_inference_steps=50,
guidance_scale=7.5, latents=None):
if isinstance(prompts, str):
prompts = [prompts]
if isinstance(negative_prompts, str):
negative_prompts = [negative_prompts]
# Prompts -> text embeds
text_embeddings = self.get_text_embeds(
prompts, negative_prompts) # [2, 77, 768]
if latents is None:
latents = torch.randn(
(text_embeddings.shape[0] // 2, self.unet.in_channels, height // 8, width // 8), device=self.device)
self.scheduler.set_timesteps(num_inference_steps)
with torch.autocast('cuda'):
for i, t in enumerate(self.scheduler.timesteps):
# expand the latents if we are doing classifier-free guidance to avoid doing two forward passes.
latent_model_input = torch.cat([latents] * 2)
# predict the noise residual
with torch.no_grad():
noise_pred = self.unet(
latent_model_input, t, encoder_hidden_states=text_embeddings)['sample']
# perform guidance
noise_pred_uncond, noise_pred_text = noise_pred.chunk(2)
noise_pred = noise_pred_uncond + guidance_scale * \
(noise_pred_text - noise_pred_uncond)
# compute the previous noisy sample x_t -> x_t-1
latents = self.scheduler.step(noise_pred, t, latents)[
'prev_sample']
# Img latents -> imgs
imgs = self.decode_latents(latents) # [1, 3, 512, 512]
# Img to Numpy
imgs = imgs.detach().cpu().permute(0, 2, 3, 1).numpy()
imgs = (imgs * 255).round().astype('uint8')
return imgs
def decode_latents(self, latents):
latents = 1 / 0.18215 * latents
with torch.no_grad():
imgs = self.vae.decode(latents).sample
imgs = (imgs / 2 + 0.5).clamp(0, 1)
return imgs
def prompt_to_img(self, prompts, negative_prompts='', height=512, width=512, num_inference_steps=50,
guidance_scale=7.5, latents=None, text_format_dict={}, use_grad_guidance=False):
if isinstance(prompts, str):
prompts = [prompts]
if isinstance(negative_prompts, str):
negative_prompts = [negative_prompts]
# Prompts -> text embeds
text_embeds = self.get_text_embeds(
prompts, negative_prompts) # [2, 77, 768]
if len(text_format_dict) > 0:
if 'font_styles' in text_format_dict and text_format_dict['font_styles'] is not None:
text_format_dict['font_styles_embs'] = self.get_text_embeds_list(
text_format_dict['font_styles']) # [2, 77, 768]
else:
text_format_dict['font_styles_embs'] = None
# else:
latents = self.produce_latents(text_embeds, height=height, width=width, latents=latents,
num_inference_steps=num_inference_steps, guidance_scale=guidance_scale,
use_grad_guidance=use_grad_guidance, text_format_dict=text_format_dict) # [1, 4, 64, 64]
# Img latents -> imgs
imgs = self.decode_latents(latents) # [1, 3, 512, 512]
# Img to Numpy
imgs = imgs.detach().cpu().permute(0, 2, 3, 1).numpy()
imgs = (imgs * 255).round().astype('uint8')
return imgs
def reset_attention_maps(self):
r"""Function to reset attention maps.
We reset attention maps because we append them while getting hooks
to visualize attention maps for every step.
"""
for key in self.attention_maps:
self.attention_maps[key] = []
def register_evaluation_hooks(self):
r"""Function for registering hooks during evaluation.
We mainly store activation maps averaged over queries.
"""
self.forward_hooks = []
def save_activations(activations, name, module, inp, out):
r"""
PyTorch Forward hook to save outputs at each forward pass.
"""
# out[0] - final output of attention layer
# out[1] - attention probability matrix
if 'attn2' in name:
assert out[1].shape[-1] == 77
activations[name].append(out[1].detach().cpu())
else:
assert out[1].shape[-1] != 77
attention_dict = collections.defaultdict(list)
for name, module in self.unet.named_modules():
leaf_name = name.split('.')[-1]
if 'attn' in leaf_name:
# Register hook to obtain outputs at every attention layer.
self.forward_hooks.append(module.register_forward_hook(
partial(save_activations, attention_dict, name)
))
# attention_dict is a dictionary containing attention maps for every attention layer
self.attention_maps = attention_dict
def remove_evaluation_hooks(self):
for hook in self.forward_hooks:
hook.remove()
self.attention_maps = None
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