From 83808fe00ac891ad2f625388d144c318b2cb5bfe Mon Sep 17 00:00:00 2001 From: Volpeon Date: Sat, 14 Jan 2023 21:53:07 +0100 Subject: WIP: Modularization ("free(): invalid pointer" my ass) --- trainer/base.py | 544 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 544 insertions(+) create mode 100644 trainer/base.py (limited to 'trainer/base.py') diff --git a/trainer/base.py b/trainer/base.py new file mode 100644 index 0000000..e700dd6 --- /dev/null +++ b/trainer/base.py @@ -0,0 +1,544 @@ +from pathlib import Path +import math +from contextlib import contextmanager +from typing import Type, Optional +import itertools +from functools import partial + +import torch +import torch.nn as nn +import torch.nn.functional as F +from torch.utils.data import DataLoader + +from accelerate import Accelerator +from transformers import CLIPTextModel +from diffusers import AutoencoderKL, DDPMScheduler, UNet2DConditionModel, DPMSolverMultistepScheduler + +from tqdm.auto import tqdm +from PIL import Image + +from pipelines.stable_diffusion.vlpn_stable_diffusion import VlpnStableDiffusion +from models.clip.tokenizer import MultiCLIPTokenizer +from models.clip.util import get_extended_embeddings +from training.util import AverageMeter + + +def make_grid(images, rows, cols): + w, h = images[0].size + grid = Image.new('RGB', size=(cols*w, rows*h)) + for i, image in enumerate(images): + grid.paste(image, box=(i % cols*w, i//cols*h)) + return grid + + +class Checkpointer(): + def __init__( + self, + accelerator: Accelerator, + vae: AutoencoderKL, + unet: UNet2DConditionModel, + text_encoder: CLIPTextModel, + tokenizer: MultiCLIPTokenizer, + sample_scheduler, + dtype, + train_dataloader: DataLoader, + val_dataloader: DataLoader, + output_dir: Path, + sample_steps: int = 20, + sample_guidance_scale: float = 7.5, + sample_image_size: int = 768, + sample_batches: int = 1, + sample_batch_size: int = 1, + seed: Optional[int] = None, + *args, + **kwargs, + ): + self.accelerator = accelerator + self.vae = vae + self.unet = unet + self.text_encoder = text_encoder + self.tokenizer = tokenizer + self.sample_scheduler = sample_scheduler + self.dtype = dtype + self.train_dataloader = train_dataloader + self.val_dataloader = val_dataloader + self.output_dir = output_dir + self.sample_steps = sample_steps + self.sample_guidance_scale = sample_guidance_scale + self.sample_image_size = sample_image_size + self.sample_batches = sample_batches + self.sample_batch_size = sample_batch_size + self.seed = seed if seed is not None else torch.random.seed() + + @torch.no_grad() + def checkpoint(self, step: int, postfix: str): + pass + + @torch.inference_mode() + def save_samples(self, step: int): + print(f"Saving samples for step {step}...") + + samples_path = self.output_dir.joinpath("samples") + + grid_cols = min(self.sample_batch_size, 4) + grid_rows = (self.sample_batches * self.sample_batch_size) // grid_cols + + unet = self.accelerator.unwrap_model(self.unet) + text_encoder = self.accelerator.unwrap_model(self.text_encoder) + + orig_unet_dtype = unet.dtype + orig_text_encoder_dtype = text_encoder.dtype + + unet.to(dtype=self.dtype) + text_encoder.to(dtype=self.dtype) + + pipeline = VlpnStableDiffusion( + text_encoder=text_encoder, + vae=self.vae, + unet=self.unet, + tokenizer=self.tokenizer, + scheduler=self.sample_scheduler, + ).to(self.accelerator.device) + pipeline.set_progress_bar_config(dynamic_ncols=True) + + generator = torch.Generator(device=self.accelerator.device).manual_seed(self.seed) + + for pool, data, gen in [ + ("stable", self.val_dataloader, generator), + ("val", self.val_dataloader, None), + ("train", self.train_dataloader, None) + ]: + all_samples = [] + file_path = samples_path.joinpath(pool, f"step_{step}.jpg") + file_path.parent.mkdir(parents=True, exist_ok=True) + + batches = list(itertools.islice(itertools.cycle(data), self.sample_batch_size * self.sample_batches)) + prompt_ids = [ + prompt + for batch in batches + for prompt in batch["prompt_ids"] + ] + nprompt_ids = [ + prompt + for batch in batches + for prompt in batch["nprompt_ids"] + ] + + for i in range(self.sample_batches): + start = i * self.sample_batch_size + end = (i + 1) * self.sample_batch_size + prompt = prompt_ids[start:end] + nprompt = nprompt_ids[start:end] + + samples = pipeline( + prompt=prompt, + negative_prompt=nprompt, + height=self.sample_image_size, + width=self.sample_image_size, + generator=gen, + guidance_scale=self.sample_guidance_scale, + num_inference_steps=self.sample_steps, + output_type='pil' + ).images + + all_samples += samples + + image_grid = make_grid(all_samples, grid_rows, grid_cols) + image_grid.save(file_path, quality=85) + + unet.to(dtype=orig_unet_dtype) + text_encoder.to(dtype=orig_text_encoder_dtype) + + del unet + del text_encoder + del generator + del pipeline + + if torch.cuda.is_available(): + torch.cuda.empty_cache() + + +class TrainingStrategy(): + def __init__( + self, + tokenizer: MultiCLIPTokenizer, + *args, + **kwargs, + ): + self.tokenizer = tokenizer + self.checkpointer = Checkpointer(tokenizer=tokenizer, *args, **kwargs) + + @property + def main_model(self) -> nn.Module: + ... + + @contextmanager + def on_train(self, epoch: int): + try: + self.tokenizer.train() + yield + finally: + pass + + @contextmanager + def on_eval(self): + try: + self.tokenizer.eval() + yield + finally: + pass + + def on_before_optimize(self, epoch: int): + ... + + def on_after_optimize(self, lr: float): + ... + + def on_log(): + return {} + + +def loss_step( + vae: AutoencoderKL, + unet: UNet2DConditionModel, + text_encoder: CLIPTextModel, + seed: int, + noise_scheduler, + prior_loss_weight: float, + step: int, + batch: dict, + eval: bool = False +): + # Convert images to latent space + latents = vae.encode(batch["pixel_values"]).latent_dist.sample().detach() + latents = latents * 0.18215 + + generator = torch.Generator(device=latents.device).manual_seed(seed + step) if eval else None + + # Sample noise that we'll add to the latents + noise = torch.randn( + latents.shape, + dtype=latents.dtype, + layout=latents.layout, + device=latents.device, + generator=generator + ) + bsz = latents.shape[0] + # Sample a random timestep for each image + timesteps = torch.randint( + 0, + noise_scheduler.config.num_train_timesteps, + (bsz,), + generator=generator, + device=latents.device, + ) + timesteps = timesteps.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) + noisy_latents = noisy_latents.to(dtype=unet.dtype) + + # Get the text embedding for conditioning + encoder_hidden_states = get_extended_embeddings( + text_encoder, + batch["input_ids"], + batch["attention_mask"] + ) + encoder_hidden_states = encoder_hidden_states.to(dtype=unet.dtype) + + # Predict the noise residual + model_pred = unet(noisy_latents, timesteps, encoder_hidden_states).sample + + # Get the target for loss depending on the prediction type + if noise_scheduler.config.prediction_type == "epsilon": + target = noise + elif noise_scheduler.config.prediction_type == "v_prediction": + target = noise_scheduler.get_velocity(latents, noise, timesteps) + else: + raise ValueError(f"Unknown prediction type {noise_scheduler.config.prediction_type}") + + if batch["with_prior"].all(): + # Chunk the noise and model_pred into two parts and compute the loss on each part separately. + model_pred, model_pred_prior = torch.chunk(model_pred, 2, dim=0) + target, target_prior = torch.chunk(target, 2, dim=0) + + # Compute instance loss + loss = F.mse_loss(model_pred.float(), target.float(), reduction="mean") + + # Compute prior loss + prior_loss = F.mse_loss(model_pred_prior.float(), target_prior.float(), reduction="mean") + + # Add the prior loss to the instance loss. + loss = loss + prior_loss_weight * prior_loss + else: + loss = F.mse_loss(model_pred.float(), target.float(), reduction="mean") + + acc = (model_pred == target).float().mean() + + return loss, acc, bsz + + +def train_loop( + strategy: TrainingStrategy, + accelerator: Accelerator, + vae: AutoencoderKL, + unet: UNet2DConditionModel, + text_encoder: CLIPTextModel, + train_dataloader: DataLoader, + val_dataloader: DataLoader, + seed: int, + optimizer: torch.optim.Optimizer, + lr_scheduler: torch.optim.lr_scheduler._LRScheduler, + noise_scheduler, + prior_loss_weight: float = 1.0, + sample_frequency: int = 10, + checkpoint_frequency: int = 50, + global_step_offset: int = 0, + num_epochs: int = 100, +): + num_training_steps_per_epoch = math.ceil( + len(train_dataloader) / accelerator.gradient_accumulation_steps + ) + num_val_steps_per_epoch = len(val_dataloader) + + num_training_steps = num_training_steps_per_epoch * num_epochs + num_val_steps = num_val_steps_per_epoch * num_epochs + + global_step = 0 + + avg_loss = AverageMeter() + avg_acc = AverageMeter() + + avg_loss_val = AverageMeter() + avg_acc_val = AverageMeter() + + max_acc_val = 0.0 + + local_progress_bar = tqdm( + range(num_training_steps_per_epoch + num_val_steps_per_epoch), + disable=not accelerator.is_local_main_process, + dynamic_ncols=True + ) + local_progress_bar.set_description(f"Epoch 1 / {num_epochs}") + + global_progress_bar = tqdm( + range(num_training_steps + num_val_steps), + disable=not accelerator.is_local_main_process, + dynamic_ncols=True + ) + global_progress_bar.set_description("Total progress") + + loss_step_ = partial( + loss_step, + vae, + unet, + text_encoder, + seed, + noise_scheduler, + prior_loss_weight + ) + + try: + for epoch in range(num_epochs): + if accelerator.is_main_process: + if epoch % sample_frequency == 0 and epoch != 0: + strategy.checkpointer.save_samples(global_step + global_step_offset) + + if epoch % checkpoint_frequency == 0 and epoch != 0: + strategy.checkpointer.checkpoint(global_step + global_step_offset, "training") + + local_progress_bar.set_description(f"Epoch {epoch + 1} / {num_epochs}") + local_progress_bar.reset() + + strategy.main_model.train() + + with strategy.on_train(epoch): + for step, batch in enumerate(train_dataloader): + with accelerator.accumulate(strategy.main_model): + loss, acc, bsz = loss_step_(step, batch) + + accelerator.backward(loss) + + strategy.on_before_optimize(epoch) + + optimizer.step() + lr_scheduler.step() + optimizer.zero_grad(set_to_none=True) + + avg_loss.update(loss.detach_(), bsz) + avg_acc.update(acc.detach_(), bsz) + + # Checks if the accelerator has performed an optimization step behind the scenes + if accelerator.sync_gradients: + strategy.on_after_optimize(lr_scheduler.get_last_lr()[0]) + + local_progress_bar.update(1) + global_progress_bar.update(1) + + global_step += 1 + + logs = { + "train/loss": avg_loss.avg.item(), + "train/acc": avg_acc.avg.item(), + "train/cur_loss": loss.item(), + "train/cur_acc": acc.item(), + "lr": lr_scheduler.get_last_lr()[0], + } + logs.update(strategy.on_log()) + + accelerator.log(logs, step=global_step) + + local_progress_bar.set_postfix(**logs) + + if global_step >= num_training_steps: + break + + accelerator.wait_for_everyone() + + strategy.main_model.eval() + + cur_loss_val = AverageMeter() + cur_acc_val = AverageMeter() + + with torch.inference_mode(), strategy.on_eval(): + for step, batch in enumerate(val_dataloader): + loss, acc, bsz = loss_step_(step, batch, True) + + loss = loss.detach_() + acc = acc.detach_() + + cur_loss_val.update(loss, bsz) + cur_acc_val.update(acc, bsz) + + avg_loss_val.update(loss, bsz) + avg_acc_val.update(acc, bsz) + + local_progress_bar.update(1) + global_progress_bar.update(1) + + logs = { + "val/loss": avg_loss_val.avg.item(), + "val/acc": avg_acc_val.avg.item(), + "val/cur_loss": loss.item(), + "val/cur_acc": acc.item(), + } + local_progress_bar.set_postfix(**logs) + + logs["val/cur_loss"] = cur_loss_val.avg.item() + logs["val/cur_acc"] = cur_acc_val.avg.item() + + accelerator.log(logs, step=global_step) + + local_progress_bar.clear() + global_progress_bar.clear() + + if accelerator.is_main_process: + if avg_acc_val.avg.item() > max_acc_val: + accelerator.print( + f"Global step {global_step}: Validation accuracy reached new maximum: {max_acc_val:.2e} -> {avg_acc_val.avg.item():.2e}") + strategy.checkpointer.checkpoint(global_step + global_step_offset, "milestone") + max_acc_val = avg_acc_val.avg.item() + + # Create the pipeline using using the trained modules and save it. + if accelerator.is_main_process: + print("Finished!") + strategy.checkpointer.checkpoint(global_step + global_step_offset, "end") + strategy.checkpointer.save_samples(global_step + global_step_offset) + accelerator.end_training() + + except KeyboardInterrupt: + if accelerator.is_main_process: + print("Interrupted") + strategy.checkpointer.checkpoint(global_step + global_step_offset, "end") + accelerator.end_training() + + +class Trainer(): + def __init__( + self, + accelerator: Accelerator, + unet: UNet2DConditionModel, + text_encoder: CLIPTextModel, + tokenizer: MultiCLIPTokenizer, + vae: AutoencoderKL, + noise_scheduler: DDPMScheduler, + sample_scheduler: DPMSolverMultistepScheduler, + train_dataloader: DataLoader, + val_dataloader: DataLoader, + dtype: torch.dtype, + ): + self.accelerator = accelerator + self.unet = unet + self.text_encoder = text_encoder + self.tokenizer = tokenizer + self.vae = vae + self.noise_scheduler = noise_scheduler + self.sample_scheduler = sample_scheduler + self.train_dataloader = train_dataloader + self.val_dataloader = val_dataloader + self.dtype = dtype + + def __call__( + self, + strategy_class: Type[TrainingStrategy], + optimizer, + lr_scheduler, + num_train_epochs: int = 100, + sample_frequency: int = 20, + checkpoint_frequency: int = 50, + global_step_offset: int = 0, + prior_loss_weight: float = 0, + seed: Optional[int] = None, + **kwargs, + ): + unet, text_encoder, optimizer, train_dataloader, val_dataloader, lr_scheduler = self.accelerator.prepare( + self.unet, self.text_encoder, optimizer, self.train_dataloader, self.val_dataloader, lr_scheduler + ) + + self.vae.to(self.accelerator.device, dtype=self.dtype) + + for model in (unet, text_encoder, self.vae): + model.requires_grad_(False) + model.eval() + + if seed is None: + seed = torch.random.seed() + + strategy = strategy_class( + accelerator=self.accelerator, + vae=self.vae, + unet=unet, + text_encoder=text_encoder, + tokenizer=self.tokenizer, + sample_scheduler=self.sample_scheduler, + train_dataloader=train_dataloader, + val_dataloader=val_dataloader, + dtype=self.dtype, + seed=seed, + **kwargs + ) + + if self.accelerator.is_main_process: + self.accelerator.init_trackers("textual_inversion") + + train_loop( + strategy=strategy, + accelerator=self.accelerator, + vae=self.vae, + unet=unet, + text_encoder=text_encoder, + train_dataloader=train_dataloader, + val_dataloader=val_dataloader, + seed=seed, + optimizer=optimizer, + lr_scheduler=lr_scheduler, + noise_scheduler=self.noise_scheduler, + prior_loss_weight=prior_loss_weight, + sample_frequency=sample_frequency, + checkpoint_frequency=checkpoint_frequency, + global_step_offset=global_step_offset, + num_epochs=num_train_epochs, + ) + + self.accelerator.free_memory() -- cgit v1.2.3-54-g00ecf