# This file is part of sygil-webui (https://github.com/Sygil-Dev/sygil-webui/). # Copyright 2022 Sygil-Dev team. # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU Affero General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU Affero General Public License for more details. # You should have received a copy of the GNU Affero General Public License # along with this program. If not, see . import argparse import itertools import math import os import random import datetime import numpy as np import torch import torch.nn.functional as F import torch.utils.checkpoint from torch.utils.data import Dataset import PIL from accelerate import Accelerator from accelerate.logging import get_logger from accelerate.utils import set_seed from diffusers import ( AutoencoderKL, DDPMScheduler, LMSDiscreteScheduler, StableDiffusionPipeline, UNet2DConditionModel, ) from diffusers.optimization import get_scheduler from pipelines.stable_diffusion.no_check import NoCheck from PIL import Image from torchvision import transforms from tqdm.auto import tqdm from transformers import CLIPFeatureExtractor, CLIPTextModel, CLIPTokenizer from slugify import slugify import json import os logger = get_logger(__name__) def parse_args(): parser = argparse.ArgumentParser(description="Simple example of a training script.") parser.add_argument( "--pretrained_model_name_or_path", type=str, default=None, help="Path to pretrained model or model identifier from huggingface.co/models.", ) parser.add_argument( "--tokenizer_name", type=str, default=None, help="Pretrained tokenizer name or path if not the same as model_name", ) parser.add_argument( "--train_data_dir", type=str, default=None, help="A folder containing the training data.", ) parser.add_argument( "--placeholder_token", type=str, default=None, help="A token to use as a placeholder for the concept.", ) parser.add_argument( "--initializer_token", type=str, default=None, help="A token to use as initializer word.", ) parser.add_argument( "--learnable_property", type=str, default="object", help="Choose between 'object' and 'style'", ) parser.add_argument( "--repeats", type=int, default=100, help="How many times to repeat the training data.", ) parser.add_argument( "--output_dir", type=str, default="text-inversion-model", help="The output directory where the model predictions and checkpoints will be written.", ) parser.add_argument( "--seed", type=int, default=None, help="A seed for reproducible training." ) parser.add_argument( "--resolution", type=int, default=512, help=( "The resolution for input images, all the images in the train/validation dataset will be resized to this" " resolution" ), ) parser.add_argument( "--center_crop", action="store_true", help="Whether to center crop images before resizing to resolution", ) parser.add_argument( "--train_batch_size", type=int, default=1, help="Batch size (per device) for the training dataloader.", ) parser.add_argument("--num_train_epochs", type=int, default=100) parser.add_argument( "--max_train_steps", type=int, default=5000, help="Total number of training steps to perform. If provided, overrides num_train_epochs.", ) parser.add_argument( "--gradient_accumulation_steps", type=int, default=1, help="Number of updates steps to accumulate before performing a backward/update pass.", ) parser.add_argument( "--learning_rate", type=float, default=1e-4, help="Initial learning rate (after the potential warmup period) to use.", ) parser.add_argument( "--scale_lr", action="store_true", default=True, help="Scale the learning rate by the number of GPUs, gradient accumulation steps, and batch size.", ) parser.add_argument( "--lr_scheduler", type=str, default="constant", help=( 'The scheduler type to use. Choose between ["linear", "cosine", "cosine_with_restarts", "polynomial",' ' "constant", "constant_with_warmup"]' ), ) parser.add_argument( "--lr_warmup_steps", type=int, default=500, help="Number of steps for the warmup in the lr scheduler.", ) parser.add_argument( "--adam_beta1", type=float, default=0.9, help="The beta1 parameter for the Adam optimizer.", ) parser.add_argument( "--adam_beta2", type=float, default=0.999, help="The beta2 parameter for the Adam optimizer.", ) parser.add_argument( "--adam_weight_decay", type=float, default=1e-2, help="Weight decay to use." ) parser.add_argument( "--adam_epsilon", type=float, default=1e-08, help="Epsilon value for the Adam optimizer", ) parser.add_argument( "--mixed_precision", type=str, default="no", choices=["no", "fp16", "bf16"], help=( "Whether to use mixed precision. Choose" "between fp16 and bf16 (bfloat16). Bf16 requires PyTorch >= 1.10." "and an Nvidia Ampere GPU." ), ) parser.add_argument( "--local_rank", type=int, default=-1, help="For distributed training: local_rank", ) parser.add_argument( "--checkpoint_frequency", type=int, default=500, help="How often to save a checkpoint and sample image", ) parser.add_argument( "--stable_sample_batches", type=int, default=0, help="Number of fixed seed sample batches to generate per checkpoint", ) parser.add_argument( "--random_sample_batches", type=int, default=1, help="Number of random seed sample batches to generate per checkpoint", ) parser.add_argument( "--sample_batch_size", type=int, default=1, help="Number of samples to generate per batch", ) parser.add_argument( "--sample_steps", type=int, default=50, help="Number of steps for sample generation. Higher values will result in more detailed samples, but longer runtimes.", ) parser.add_argument( "--custom_templates", type=str, default=None, help=( "A semicolon-delimited list of custom template to use for samples, using {} as a placeholder for the concept." ), ) parser.add_argument( "--resume_from", type=str, default=None, help="Path to a directory to resume training from (ie, logs/token_name/2022-09-22T23-36-27)", ) parser.add_argument( "--resume_checkpoint", type=str, default=None, help="Path to a specific checkpoint to resume training from (ie, logs/token_name/2022-09-22T23-36-27/checkpoints/something.bin).", ) parser.add_argument( "--config", type=str, default=None, help="Path to a JSON configuration file containing arguments for invoking this script. If resume_from is given, its resume.json takes priority over this.", ) args = parser.parse_args() if args.resume_from is not None: with open(f"{args.resume_from}/resume.json", "rt") as f: args = parser.parse_args( namespace=argparse.Namespace(**json.load(f)["args"]) ) elif args.config is not None: with open(args.config, "rt") as f: args = parser.parse_args( namespace=argparse.Namespace(**json.load(f)["args"]) ) env_local_rank = int(os.environ.get("LOCAL_RANK", -1)) if env_local_rank != -1 and env_local_rank != args.local_rank: args.local_rank = env_local_rank if args.train_data_dir is None: raise ValueError("You must specify --train_data_dir") if args.pretrained_model_name_or_path is None: raise ValueError("You must specify --pretrained_model_name_or_path") if args.placeholder_token is None: raise ValueError("You must specify --placeholder_token") if args.initializer_token is None: raise ValueError("You must specify --initializer_token") if args.output_dir is None: raise ValueError("You must specify --output_dir") return args imagenet_templates_small = [ "a photo of a {}", "a rendering of a {}", "a cropped photo of the {}", "the photo of a {}", "a photo of a clean {}", "a photo of a dirty {}", "a dark photo of the {}", "a photo of my {}", "a photo of the cool {}", "a close-up photo of a {}", "a bright photo of the {}", "a cropped photo of a {}", "a photo of the {}", "a good photo of the {}", "a photo of one {}", "a close-up photo of the {}", "a rendition of the {}", "a photo of the clean {}", "a rendition of a {}", "a photo of a nice {}", "a good photo of a {}", "a photo of the nice {}", "a photo of the small {}", "a photo of the weird {}", "a photo of the large {}", "a photo of a cool {}", "a photo of a small {}", ] imagenet_style_templates_small = [ "a painting in the style of {}", "a rendering in the style of {}", "a cropped painting in the style of {}", "the painting in the style of {}", "a clean painting in the style of {}", "a dirty painting in the style of {}", "a dark painting in the style of {}", "a picture in the style of {}", "a cool painting in the style of {}", "a close-up painting in the style of {}", "a bright painting in the style of {}", "a cropped painting in the style of {}", "a good painting in the style of {}", "a close-up painting in the style of {}", "a rendition in the style of {}", "a nice painting in the style of {}", "a small painting in the style of {}", "a weird painting in the style of {}", "a large painting in the style of {}", ] class TextualInversionDataset(Dataset): def __init__( self, data_root, tokenizer, learnable_property="object", # [object, style] size=512, repeats=100, interpolation="bicubic", set="train", placeholder_token="*", center_crop=False, templates=None, ): self.data_root = data_root self.tokenizer = tokenizer self.learnable_property = learnable_property self.size = size self.placeholder_token = placeholder_token self.center_crop = center_crop self.image_paths = [ os.path.join(self.data_root, file_path) for file_path in os.listdir(self.data_root) if file_path.lower().endswith((".png", ".jpg", ".jpeg")) ] self.num_images = len(self.image_paths) self._length = self.num_images if set == "train": self._length = self.num_images * repeats self.interpolation = { "linear": PIL.Image.LINEAR, "bilinear": PIL.Image.BILINEAR, "bicubic": PIL.Image.BICUBIC, "lanczos": PIL.Image.LANCZOS, }[interpolation] self.templates = templates self.cache = {} self.tokenized_templates = [ self.tokenizer( text.format(self.placeholder_token), padding="max_length", truncation=True, max_length=self.tokenizer.model_max_length, return_tensors="pt", ).input_ids[0] for text in self.templates ] def __len__(self): return self._length def get_example(self, image_path, flipped): if image_path in self.cache: return self.cache[image_path] example = {} image = Image.open(image_path) if not image.mode == "RGB": image = image.convert("RGB") # default to score-sde preprocessing img = np.array(image).astype(np.uint8) if self.center_crop: 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) image = image.resize((self.size, self.size), resample=self.interpolation) image = transforms.RandomHorizontalFlip(p=1 if flipped else 0)(image) image = np.array(image).astype(np.uint8) image = (image / 127.5 - 1.0).astype(np.float32) example["key"] = "-".join([image_path, "-", str(flipped)]) example["pixel_values"] = torch.from_numpy(image).permute(2, 0, 1) self.cache[image_path] = example return example def __getitem__(self, i): flipped = random.choice([False, True]) example = self.get_example(self.image_paths[i % self.num_images], flipped) example["input_ids"] = random.choice(self.tokenized_templates) return example def freeze_params(params): for param in params: param.requires_grad = False def save_resume_file(basepath, args, extra={}): info = {"args": vars(args)} info["args"].update(extra) with open(f"{basepath}/resume.json", "w") as f: json.dump(info, f, indent=4) class Checkpointer: def __init__( self, accelerator, vae, unet, tokenizer, placeholder_token, placeholder_token_id, templates, output_dir, random_sample_batches, sample_batch_size, stable_sample_batches, seed, ): self.accelerator = accelerator self.vae = vae self.unet = unet self.tokenizer = tokenizer self.placeholder_token = placeholder_token self.placeholder_token_id = placeholder_token_id self.templates = templates self.output_dir = output_dir self.seed = seed self.random_sample_batches = random_sample_batches self.sample_batch_size = sample_batch_size self.stable_sample_batches = stable_sample_batches @torch.no_grad() def checkpoint(self, step, text_encoder, save_samples=True, path=None): print("Saving checkpoint for step %d..." % step) with torch.autocast("cuda"): if path is None: checkpoints_path = f"{self.output_dir}/checkpoints" os.makedirs(checkpoints_path, exist_ok=True) unwrapped = self.accelerator.unwrap_model(text_encoder) # Save a checkpoint learned_embeds = unwrapped.get_input_embeddings().weight[ self.placeholder_token_id ] learned_embeds_dict = { self.placeholder_token: learned_embeds.detach().cpu() } filename = "%s_%d.bin" % (slugify(self.placeholder_token), step) if path is not None: torch.save(learned_embeds_dict, path) else: torch.save(learned_embeds_dict, f"{checkpoints_path}/{filename}") torch.save(learned_embeds_dict, f"{checkpoints_path}/last.bin") del unwrapped del learned_embeds @torch.no_grad() def save_samples( self, step, text_encoder, height, width, guidance_scale, eta, num_inference_steps, ): samples_path = f"{self.output_dir}/samples" os.makedirs(samples_path, exist_ok=True) checker = NoCheck() unwrapped = self.accelerator.unwrap_model(text_encoder) # Save a sample image pipeline = StableDiffusionPipeline( text_encoder=unwrapped, vae=self.vae, unet=self.unet, tokenizer=self.tokenizer, scheduler=LMSDiscreteScheduler( beta_start=0.00085, beta_end=0.012, beta_schedule="scaled_linear" ), safety_checker=NoCheck(), feature_extractor=CLIPFeatureExtractor.from_pretrained( "openai/clip-vit-base-patch32" ), ).to("cuda") pipeline.enable_attention_slicing() if self.stable_sample_batches > 0: stable_latents = torch.randn( ( self.sample_batch_size, pipeline.unet.in_channels, height // 8, width // 8, ), device=pipeline.device, generator=torch.Generator(device=pipeline.device).manual_seed( self.seed ), ) stable_prompts = [ choice.format(self.placeholder_token) for choice in (self.templates * self.sample_batch_size)[ : self.sample_batch_size ] ] # Generate and save stable samples for i in range(0, self.stable_sample_batches): samples = pipeline( prompt=stable_prompts, height=384, latents=stable_latents, width=384, guidance_scale=guidance_scale, eta=eta, num_inference_steps=num_inference_steps, output_type="pil", )["sample"] for idx, im in enumerate(samples): filename = "stable_sample_%d_%d_step_%d.png" % ( i + 1, idx + 1, step, ) im.save(f"{samples_path}/{filename}") del samples del stable_latents prompts = [ choice.format(self.placeholder_token) for choice in random.choices(self.templates, k=self.sample_batch_size) ] # Generate and save random samples for i in range(0, self.random_sample_batches): samples = pipeline( prompt=prompts, height=384, width=384, guidance_scale=guidance_scale, eta=eta, num_inference_steps=num_inference_steps, output_type="pil", )["sample"] for idx, im in enumerate(samples): filename = "step_%d_sample_%d_%d.png" % (step, i + 1, idx + 1) im.save(f"{samples_path}/{filename}") del samples del checker del unwrapped del pipeline torch.cuda.empty_cache() def main(): args = parse_args() global_step_offset = 0 if args.resume_from is not None: basepath = f"{args.resume_from}" print("Resuming state from %s" % args.resume_from) with open(f"{basepath}/resume.json", "r") as f: state = json.load(f) global_step_offset = state["args"].get("global_step", 0) print("We've trained %d steps so far" % global_step_offset) else: now = datetime.datetime.now().strftime("%Y-%m-%dT%H-%M-%S") basepath = f"{args.output_dir}/{slugify(args.placeholder_token)}/{now}" os.makedirs(basepath, exist_ok=True) accelerator = Accelerator( gradient_accumulation_steps=args.gradient_accumulation_steps, mixed_precision=args.mixed_precision, ) # If passed along, set the training seed now. if args.seed is not None: set_seed(args.seed) # Load the tokenizer and add the placeholder token as a additional special token if args.tokenizer_name: tokenizer = CLIPTokenizer.from_pretrained(args.tokenizer_name) elif args.pretrained_model_name_or_path: tokenizer = CLIPTokenizer.from_pretrained( args.pretrained_model_name_or_path + "/tokenizer" ) # Add the placeholder token in tokenizer num_added_tokens = tokenizer.add_tokens(args.placeholder_token) if num_added_tokens == 0: raise ValueError( f"The tokenizer already contains the token {args.placeholder_token}. Please pass a different" " `placeholder_token` that is not already in the tokenizer." ) # Convert the initializer_token, placeholder_token to ids token_ids = tokenizer.encode(args.initializer_token, add_special_tokens=False) # Check if initializer_token is a single token or a sequence of tokens if len(token_ids) > 1: raise ValueError("The initializer token must be a single token.") initializer_token_id = token_ids[0] placeholder_token_id = tokenizer.convert_tokens_to_ids(args.placeholder_token) # Load models and create wrapper for stable diffusion text_encoder = CLIPTextModel.from_pretrained( args.pretrained_model_name_or_path + "/text_encoder", ) vae = AutoencoderKL.from_pretrained( args.pretrained_model_name_or_path + "/vae", ) unet = UNet2DConditionModel.from_pretrained( args.pretrained_model_name_or_path + "/unet", ) base_templates = ( imagenet_style_templates_small if args.learnable_property == "style" else imagenet_templates_small ) if args.custom_templates: templates = args.custom_templates.split(";") else: templates = base_templates slice_size = unet.config.attention_head_dim // 2 unet.set_attention_slice(slice_size) # Resize the token embeddings as we are adding new special tokens to the tokenizer text_encoder.resize_token_embeddings(len(tokenizer)) # Initialise the newly added placeholder token with the embeddings of the initializer token token_embeds = text_encoder.get_input_embeddings().weight.data if args.resume_checkpoint is not None: token_embeds[placeholder_token_id] = torch.load(args.resume_checkpoint)[ args.placeholder_token ] else: token_embeds[placeholder_token_id] = token_embeds[initializer_token_id] # Freeze vae and unet freeze_params(vae.parameters()) freeze_params(unet.parameters()) # Freeze all parameters except for the token embeddings in text encoder params_to_freeze = itertools.chain( text_encoder.text_model.encoder.parameters(), text_encoder.text_model.final_layer_norm.parameters(), text_encoder.text_model.embeddings.position_embedding.parameters(), ) freeze_params(params_to_freeze) checkpointer = Checkpointer( accelerator=accelerator, vae=vae, unet=unet, tokenizer=tokenizer, placeholder_token=args.placeholder_token, placeholder_token_id=placeholder_token_id, templates=templates, output_dir=basepath, sample_batch_size=args.sample_batch_size, random_sample_batches=args.random_sample_batches, stable_sample_batches=args.stable_sample_batches, seed=args.seed, ) if args.scale_lr: args.learning_rate = ( args.learning_rate * args.gradient_accumulation_steps * args.train_batch_size * accelerator.num_processes ) # Initialize the optimizer optimizer = torch.optim.AdamW( text_encoder.get_input_embeddings().parameters(), # only optimize the embeddings lr=args.learning_rate, betas=(args.adam_beta1, args.adam_beta2), weight_decay=args.adam_weight_decay, eps=args.adam_epsilon, ) # TODO (patil-suraj): laod scheduler using args noise_scheduler = DDPMScheduler( beta_start=0.00085, beta_end=0.012, beta_schedule="scaled_linear", num_train_timesteps=1000, tensor_format="pt", ) train_dataset = TextualInversionDataset( data_root=args.train_data_dir, tokenizer=tokenizer, size=args.resolution, placeholder_token=args.placeholder_token, repeats=args.repeats, learnable_property=args.learnable_property, center_crop=args.center_crop, set="train", templates=templates, ) train_dataloader = torch.utils.data.DataLoader( train_dataset, batch_size=args.train_batch_size, shuffle=True ) # Scheduler and math around the number of training steps. overrode_max_train_steps = False num_update_steps_per_epoch = math.ceil( len(train_dataloader) / args.gradient_accumulation_steps ) if args.max_train_steps is None: args.max_train_steps = args.num_train_epochs * num_update_steps_per_epoch overrode_max_train_steps = True lr_scheduler = get_scheduler( args.lr_scheduler, optimizer=optimizer, num_warmup_steps=args.lr_warmup_steps * args.gradient_accumulation_steps, num_training_steps=args.max_train_steps * args.gradient_accumulation_steps, ) text_encoder, optimizer, train_dataloader, lr_scheduler = accelerator.prepare( text_encoder, optimizer, train_dataloader, lr_scheduler ) # Move vae and unet to device vae.to(accelerator.device) unet.to(accelerator.device) # Keep vae and unet in eval mode as we don't train these vae.eval() unet.eval() # We need to recalculate our total training steps as the size of the training dataloader may have changed. num_update_steps_per_epoch = math.ceil( len(train_dataloader) / args.gradient_accumulation_steps ) if overrode_max_train_steps: args.max_train_steps = args.num_train_epochs * num_update_steps_per_epoch # Afterwards we recalculate our number of training epochs args.num_train_epochs = math.ceil(args.max_train_steps / num_update_steps_per_epoch) # We need to initialize the trackers we use, and also store our configuration. # The trackers initializes automatically on the main process. if accelerator.is_main_process: accelerator.init_trackers("textual_inversion", config=vars(args)) # Train! total_batch_size = ( args.train_batch_size * accelerator.num_processes * args.gradient_accumulation_steps ) logger.info("***** Running training *****") logger.info(f" Num examples = {len(train_dataset)}") logger.info(f" Num Epochs = {args.num_train_epochs}") logger.info(f" Instantaneous batch size per device = {args.train_batch_size}") logger.info( f" Total train batch size (w. parallel, distributed & accumulation) = {total_batch_size}" ) logger.info(f" Gradient Accumulation steps = {args.gradient_accumulation_steps}") logger.info(f" Total optimization steps = {args.max_train_steps}") # Only show the progress bar once on each machine. progress_bar = tqdm( range(args.max_train_steps), disable=not accelerator.is_local_main_process ) progress_bar.set_description("Steps") global_step = 0 encoded_pixel_values_cache = {} try: for epoch in range(args.num_train_epochs): text_encoder.train() for step, batch in enumerate(train_dataloader): with accelerator.accumulate(text_encoder): # Convert images to latent space key = "|".join(batch["key"]) if encoded_pixel_values_cache.get(key, None) is None: encoded_pixel_values_cache[key] = vae.encode( batch["pixel_values"] ).latent_dist latents = ( encoded_pixel_values_cache[key].sample().detach().half() * 0.18215 ) # Sample noise that we'll add to the latents noise = torch.randn(latents.shape).to(latents.device) bsz = latents.shape[0] # Sample a random timestep for each image timesteps = torch.randint( 0, noise_scheduler.num_train_timesteps, (bsz,), device=latents.device, ).long() # Add noise to the latents according to the noise magnitude at each timestep # (this is the forward diffusion process) noisy_latents = noise_scheduler.add_noise(latents, noise, timesteps) # Get the text embedding for conditioning encoder_hidden_states = text_encoder(batch["input_ids"])[0] # Predict the noise residual noise_pred = unet( noisy_latents, timesteps, encoder_hidden_states ).sample loss = ( F.mse_loss(noise_pred, noise, reduction="none") .mean([1, 2, 3]) .mean() ) accelerator.backward(loss) # Zero out the gradients for all token embeddings except the newly added # embeddings for the concept, as we only want to optimize the concept embeddings if accelerator.num_processes > 1: grads = text_encoder.module.get_input_embeddings().weight.grad else: grads = text_encoder.get_input_embeddings().weight.grad # Get the index for tokens that we want to zero the grads for index_grads_to_zero = ( torch.arange(len(tokenizer)) != placeholder_token_id ) grads.data[index_grads_to_zero, :] = grads.data[ index_grads_to_zero, : ].fill_(0) optimizer.step() lr_scheduler.step() optimizer.zero_grad() # Checks if the accelerator has performed an optimization step behind the scenes if accelerator.sync_gradients: progress_bar.update(1) global_step += 1 if ( global_step % args.checkpoint_frequency == 0 and global_step > 0 and accelerator.is_main_process ): checkpointer.checkpoint( global_step + global_step_offset, text_encoder ) save_resume_file( basepath, args, { "global_step": global_step + global_step_offset, "resume_checkpoint": f"{basepath}/checkpoints/last.bin", }, ) checkpointer.save_samples( global_step + global_step_offset, text_encoder, args.resolution, args.resolution, 7.5, 0.0, args.sample_steps, ) logs = { "loss": loss.detach().item(), "lr": lr_scheduler.get_last_lr()[0], } progress_bar.set_postfix(**logs) # accelerator.log(logs, step=global_step) if global_step >= args.max_train_steps: break accelerator.wait_for_everyone() # Create the pipeline using using the trained modules and save it. if accelerator.is_main_process: print("Finished! Saving final checkpoint and resume state.") checkpointer.checkpoint( global_step + global_step_offset, text_encoder, path=f"{basepath}/learned_embeds.bin", ) save_resume_file( basepath, args, { "global_step": global_step + global_step_offset, "resume_checkpoint": f"{basepath}/checkpoints/last.bin", }, ) accelerator.end_training() except KeyboardInterrupt: if accelerator.is_main_process: print("Interrupted, saving checkpoint and resume state...") checkpointer.checkpoint(global_step + global_step_offset, text_encoder) save_resume_file( basepath, args, { "global_step": global_step + global_step_offset, "resume_checkpoint": f"{basepath}/checkpoints/last.bin", }, ) quit() if __name__ == "__main__": main()