from PIL import Image from matplotlib import pyplot as plt import textwrap import argparse import torch import copy import os import re import numpy as np from diffusers import AutoencoderKL, UNet2DConditionModel from PIL import Image from tqdm.auto import tqdm from transformers import CLIPTextModel, CLIPTokenizer, CLIPFeatureExtractor from diffusers.schedulers import EulerAncestralDiscreteScheduler from diffusers.schedulers.scheduling_ddim import DDIMScheduler from diffusers.schedulers.scheduling_ddpm import DDPMScheduler from diffusers.schedulers.scheduling_lms_discrete import LMSDiscreteScheduler from diffusers.pipelines.stable_diffusion import StableDiffusionSafetyChecker def to_gif(images, path): images[0].save(path, save_all=True, append_images=images[1:], loop=0, duration=len(images) * 20) def figure_to_image(figure): figure.set_dpi(300) figure.canvas.draw() return Image.frombytes('RGB', figure.canvas.get_width_height(), figure.canvas.tostring_rgb()) def image_grid(images, outpath=None, column_titles=None, row_titles=None): n_rows = len(images) n_cols = len(images[0]) fig, axs = plt.subplots(nrows=n_rows, ncols=n_cols, figsize=(n_cols, n_rows), squeeze=False) for row, _images in enumerate(images): for column, image in enumerate(_images): ax = axs[row][column] ax.imshow(image) if column_titles and row == 0: ax.set_title(textwrap.fill( column_titles[column], width=12), fontsize='x-small') if row_titles and column == 0: ax.set_ylabel(row_titles[row], rotation=0, fontsize='x-small', labelpad=1.6 * len(row_titles[row])) ax.set_xticks([]) ax.set_yticks([]) plt.subplots_adjust(wspace=0, hspace=0) if outpath is not None: plt.savefig(outpath, bbox_inches='tight', dpi=300) plt.close() else: plt.tight_layout(pad=0) image = figure_to_image(plt.gcf()) plt.close() return image def get_module(module, module_name): if isinstance(module_name, str): module_name = module_name.split('.') if len(module_name) == 0: return module else: module = getattr(module, module_name[0]) return get_module(module, module_name[1:]) def set_module(module, module_name, new_module): if isinstance(module_name, str): module_name = module_name.split('.') if len(module_name) == 1: return setattr(module, module_name[0], new_module) else: module = getattr(module, module_name[0]) return set_module(module, module_name[1:], new_module) def freeze(module): for parameter in module.parameters(): parameter.requires_grad = False def unfreeze(module): for parameter in module.parameters(): parameter.requires_grad = True def get_concat_h(im1, im2): dst = Image.new('RGB', (im1.width + im2.width, im1.height)) dst.paste(im1, (0, 0)) dst.paste(im2, (im1.width, 0)) return dst def get_concat_v(im1, im2): dst = Image.new('RGB', (im1.width, im1.height + im2.height)) dst.paste(im1, (0, 0)) dst.paste(im2, (0, im1.height)) return dst class StableDiffuser(torch.nn.Module): def __init__(self, scheduler='LMS' ): super().__init__() # Load the autoencoder model which will be used to decode the latents into image space. self.vae = AutoencoderKL.from_pretrained( "CompVis/stable-diffusion-v1-4", subfolder="vae") # Load the tokenizer and text encoder to tokenize and encode the text. self.tokenizer = CLIPTokenizer.from_pretrained( "openai/clip-vit-large-patch14") self.text_encoder = CLIPTextModel.from_pretrained( "openai/clip-vit-large-patch14") # The UNet model for generating the latents. self.unet = UNet2DConditionModel.from_pretrained( "CompVis/stable-diffusion-v1-4", subfolder="unet") self.feature_extractor = CLIPFeatureExtractor.from_pretrained("CompVis/stable-diffusion-v1-4", subfolder="feature_extractor") self.safety_checker = StableDiffusionSafetyChecker.from_pretrained("CompVis/stable-diffusion-v1-4", subfolder="safety_checker") if scheduler == 'LMS': self.scheduler = LMSDiscreteScheduler(beta_start=0.00085, beta_end=0.012, beta_schedule="scaled_linear", num_train_timesteps=1000) elif scheduler == 'DDIM': self.scheduler = DDIMScheduler.from_pretrained("CompVis/stable-diffusion-v1-4", subfolder="scheduler") elif scheduler == 'DDPM': self.scheduler = DDPMScheduler.from_pretrained("CompVis/stable-diffusion-v1-4", subfolder="scheduler") self.eval() def get_noise(self, batch_size, img_size, generator=None): param = list(self.parameters())[0] return torch.randn( (batch_size, self.unet.in_channels, img_size // 8, img_size // 8), generator=generator).type(param.dtype).to(param.device) def add_noise(self, latents, noise, step): return self.scheduler.add_noise(latents, noise, torch.tensor([self.scheduler.timesteps[step]])) def text_tokenize(self, prompts): return self.tokenizer(prompts, padding="max_length", max_length=self.tokenizer.model_max_length, truncation=True, return_tensors="pt") def text_detokenize(self, tokens): return [self.tokenizer.decode(token) for token in tokens if token != self.tokenizer.vocab_size - 1] def text_encode(self, tokens): return self.text_encoder(tokens.input_ids.to(self.unet.device))[0] def decode(self, latents): return self.vae.decode(1 / self.vae.config.scaling_factor * latents).sample def encode(self, tensors): return self.vae.encode(tensors).latent_dist.mode() * 0.18215 def to_image(self, image): image = (image / 2 + 0.5).clamp(0, 1) image = image.detach().cpu().permute(0, 2, 3, 1).numpy() images = (image * 255).round().astype("uint8") pil_images = [Image.fromarray(image) for image in images] return pil_images def set_scheduler_timesteps(self, n_steps): self.scheduler.set_timesteps(n_steps, device=self.unet.device) def get_initial_latents(self, n_imgs, img_size, n_prompts, generator=None): noise = self.get_noise(n_imgs, img_size, generator=generator).repeat(n_prompts, 1, 1, 1) latents = noise * self.scheduler.init_noise_sigma return latents def get_text_embeddings(self, prompts, n_imgs): text_tokens = self.text_tokenize(prompts) text_embeddings = self.text_encode(text_tokens) unconditional_tokens = self.text_tokenize([""] * len(prompts)) unconditional_embeddings = self.text_encode(unconditional_tokens) text_embeddings = torch.cat([unconditional_embeddings, text_embeddings]).repeat_interleave(n_imgs, dim=0) return text_embeddings def predict_noise(self, iteration, latents, text_embeddings, guidance_scale=7.5 ): # expand the latents if we are doing classifier-free guidance to avoid doing two forward passes. latents = torch.cat([latents] * 2) latents = self.scheduler.scale_model_input( latents, self.scheduler.timesteps[iteration]) # predict the noise residual noise_prediction = self.unet( latents, self.scheduler.timesteps[iteration], encoder_hidden_states=text_embeddings).sample # perform guidance noise_prediction_uncond, noise_prediction_text = noise_prediction.chunk(2) noise_prediction = noise_prediction_uncond + guidance_scale * \ (noise_prediction_text - noise_prediction_uncond) return noise_prediction @torch.no_grad() def diffusion(self, latents, text_embeddings, end_iteration=1000, start_iteration=0, return_steps=False, pred_x0=False, trace_args=None, show_progress=True, **kwargs): latents_steps = [] trace_steps = [] trace = None for iteration in tqdm(range(start_iteration, end_iteration), disable=not show_progress): if trace_args: trace = TraceDict(self, **trace_args) noise_pred = self.predict_noise( iteration, latents, text_embeddings, **kwargs) # compute the previous noisy sample x_t -> x_t-1 output = self.scheduler.step(noise_pred, self.scheduler.timesteps[iteration], latents) if trace_args: trace.close() trace_steps.append(trace) latents = output.prev_sample if return_steps or iteration == end_iteration - 1: output = output.pred_original_sample if pred_x0 else latents if return_steps: latents_steps.append(output.cpu()) else: latents_steps.append(output) return latents_steps, trace_steps @torch.no_grad() def __call__(self, prompts, img_size=512, n_steps=50, n_imgs=1, end_iteration=None, generator=None, **kwargs ): assert 0 <= n_steps <= 1000 if not isinstance(prompts, list): prompts = [prompts] self.set_scheduler_timesteps(n_steps) latents = self.get_initial_latents(n_imgs, img_size, len(prompts), generator=generator) text_embeddings = self.get_text_embeddings(prompts,n_imgs=n_imgs) end_iteration = end_iteration or n_steps latents_steps, trace_steps = self.diffusion( latents, text_embeddings, end_iteration=end_iteration, **kwargs ) latents_steps = [self.decode(latents.to(self.unet.device)) for latents in latents_steps] images_steps = [self.to_image(latents) for latents in latents_steps] # for i in range(len(images_steps)): # self.safety_checker = self.safety_checker.float() # safety_checker_input = self.feature_extractor(images_steps[i], return_tensors="pt").to(latents_steps[0].device) # image, has_nsfw_concept = self.safety_checker( # images=latents_steps[i].float().cpu().numpy(), clip_input=safety_checker_input.pixel_values.float() # ) # images_steps[i][0] = self.to_image(torch.from_numpy(image))[0] images_steps = list(zip(*images_steps)) if trace_steps: return images_steps, trace_steps return images_steps class FineTunedModel(torch.nn.Module): def __init__(self, model, train_method, ): super().__init__() self.model = model self.ft_modules = {} self.orig_modules = {} freeze(self.model) for module_name, module in model.named_modules(): if 'unet' not in module_name: continue if module.__class__.__name__ in ["Linear", "Conv2d", "LoRACompatibleLinear", "LoRACompatibleConv"]: if train_method == 'xattn': if 'attn2' not in module_name: continue elif train_method == 'xattn-strict': if 'attn2' not in module_name or 'to_q' not in module_name or 'to_k' not in module_name: continue elif train_method == 'noxattn': if 'attn2' in module_name: continue elif train_method == 'selfattn': if 'attn1' not in module_name: continue else: raise NotImplementedError( f"train_method: {train_method} is not implemented." ) # print(module_name) ft_module = copy.deepcopy(module) self.orig_modules[module_name] = module self.ft_modules[module_name] = ft_module unfreeze(ft_module) self.ft_modules_list = torch.nn.ModuleList(self.ft_modules.values()) self.orig_modules_list = torch.nn.ModuleList(self.orig_modules.values()) @classmethod def from_checkpoint(cls, model, checkpoint, train_method): if isinstance(checkpoint, str): checkpoint = torch.load(checkpoint) modules = [f"{key}$" for key in list(checkpoint.keys())] ftm = FineTunedModel(model, train_method=train_method) ftm.load_state_dict(checkpoint) return ftm def __enter__(self): for key, ft_module in self.ft_modules.items(): set_module(self.model, key, ft_module) def __exit__(self, exc_type, exc_value, tb): for key, module in self.orig_modules.items(): set_module(self.model, key, module) def parameters(self): parameters = [] for ft_module in self.ft_modules.values(): parameters.extend(list(ft_module.parameters())) return parameters def state_dict(self): state_dict = {key: module.state_dict() for key, module in self.ft_modules.items()} return state_dict def load_state_dict(self, state_dict): for key, sd in state_dict.items(): self.ft_modules[key].load_state_dict(sd) def train(erase_concept, erase_from, train_method, iterations, negative_guidance, lr, save_path): nsteps = 50 diffuser = StableDiffuser(scheduler='DDIM').to('cuda') diffuser.train() finetuner = FineTunedModel(diffuser, train_method=train_method) optimizer = torch.optim.Adam(finetuner.parameters(), lr=lr) criteria = torch.nn.MSELoss() pbar = tqdm(range(iterations)) erase_concept = erase_concept.split(',') erase_concept = [a.strip() for a in erase_concept] erase_from = erase_from.split(',') erase_from = [a.strip() for a in erase_from] if len(erase_from)!=len(erase_concept): if len(erase_from) == 1: c = erase_from[0] erase_from = [c for _ in erase_concept] else: print(erase_from, erase_concept) raise Exception("Erase from concepts length need to match erase concepts length") erase_concept_ = [] for e, f in zip(erase_concept, erase_from): erase_concept_.append([e,f]) erase_concept = erase_concept_ print(erase_concept) # del diffuser.vae # del diffuser.text_encoder # del diffuser.tokenizer torch.cuda.empty_cache() for i in pbar: with torch.no_grad(): index = np.random.choice(len(erase_concept), 1, replace=False)[0] erase_concept_sampled = erase_concept[index] neutral_text_embeddings = diffuser.get_text_embeddings([''],n_imgs=1) positive_text_embeddings = diffuser.get_text_embeddings([erase_concept_sampled[0]],n_imgs=1) target_text_embeddings = diffuser.get_text_embeddings([erase_concept_sampled[1]],n_imgs=1) diffuser.set_scheduler_timesteps(nsteps) optimizer.zero_grad() iteration = torch.randint(1, nsteps - 1, (1,)).item() latents = diffuser.get_initial_latents(1, 512, 1) with finetuner: latents_steps, _ = diffuser.diffusion( latents, positive_text_embeddings, start_iteration=0, end_iteration=iteration, guidance_scale=3, show_progress=False ) diffuser.set_scheduler_timesteps(1000) iteration = int(iteration / nsteps * 1000) positive_latents = diffuser.predict_noise(iteration, latents_steps[0], positive_text_embeddings, guidance_scale=1) neutral_latents = diffuser.predict_noise(iteration, latents_steps[0], neutral_text_embeddings, guidance_scale=1) target_latents = diffuser.predict_noise(iteration, latents_steps[0], target_text_embeddings, guidance_scale=1) if erase_concept_sampled[0] == erase_concept_sampled[1]: target_latents = neutral_latents.clone().detach() with finetuner: negative_latents = diffuser.predict_noise(iteration, latents_steps[0], target_text_embeddings, guidance_scale=1) positive_latents.requires_grad = False neutral_latents.requires_grad = False loss = criteria(negative_latents, target_latents - (negative_guidance*(positive_latents - neutral_latents))) #loss = criteria(e_n, e_0) works the best try 5000 epochs loss.backward() optimizer.step() try: torch.save(finetuner.state_dict(), save_path) print(f"Model saved successfully at {save_path}") except Exception as e: print(f"Error saving model: {e}") del diffuser, loss, optimizer, finetuner, negative_latents, neutral_latents, positive_latents, latents_steps, latents torch.cuda.empty_cache() if __name__ == '__main__': parser = argparse.ArgumentParser( prog = 'TrainESD', description = 'Finetuning stable diffusion to erase the concepts') parser.add_argument('--erase_concept', help='concept to erase', type=str, required=True) parser.add_argument('--erase_from', help='target concept to erase from', type=str, required=False, default = None) parser.add_argument('--train_method', help='Type of method (xattn, noxattn, full, xattn-strict', type=str, required=True) parser.add_argument('--iterations', help='Number of iterations', type=int, default=200) parser.add_argument('--lr', help='Learning rate', type=float, default=2e-5) parser.add_argument('--negative_guidance', help='Negative guidance value', type=float, required=False, default=1) parser.add_argument('--save_path', help='Path to save model', type=str, default='models/') parser.add_argument('--device', help='cuda device to train on', type=str, required=False, default='cuda:0') args = parser.parse_args() prompt = args.erase_concept #'car' erase_concept = args.erase_concept erase_from = args.erase_from if erase_from is None: erase_from = erase_concept train_method = args.train_method #'noxattn' iterations = args.iterations #200 negative_guidance = args.negative_guidance #1 lr = args.lr #1e-5 name = f"esd-{erase_concept.lower().replace(' ','').replace(',','')}_from_{erase_from.lower().replace(' ','').replace(',','')}-{train_method}_{negative_guidance}-epochs_{iterations}" if not os.path.exists(args.save_path): os.makedirs(args.save_path, exist_ok = True) save_path = os.path.join(args.save_path, f"{name}.pt") print("save path", save_path) train(erase_concept=erase_concept, erase_from=erase_from, train_method=train_method, iterations=iterations, negative_guidance=negative_guidance, lr=lr, save_path=save_path)