add sdxl fine-tuning and LoRA

This commit is contained in:
Kohya S
2023-06-26 08:07:24 +09:00
parent 9e9df2b501
commit 747af145ed
11 changed files with 2442 additions and 754 deletions

605
sdxl_train.py Normal file
View File

@@ -0,0 +1,605 @@
# training with captions
import argparse
import gc
import math
import os
from multiprocessing import Value
from tqdm import tqdm
import torch
from accelerate.utils import set_seed
from diffusers import DDPMScheduler
from library import sdxl_model_util
import library.train_util as train_util
import library.config_util as config_util
import library.sdxl_train_util as sdxl_train_util
from library.config_util import (
ConfigSanitizer,
BlueprintGenerator,
)
import library.custom_train_functions as custom_train_functions
from library.custom_train_functions import (
apply_snr_weight,
prepare_scheduler_for_custom_training,
pyramid_noise_like,
apply_noise_offset,
scale_v_prediction_loss_like_noise_prediction,
)
from library.sdxl_original_unet import SdxlUNet2DConditionModel
def train(args):
train_util.verify_training_args(args)
train_util.prepare_dataset_args(args, True)
sdxl_train_util.verify_sdxl_training_args(args)
assert not args.weighted_captions, "weighted_captions is not supported currently / weighted_captionsは現在サポートされていません"
assert (
not args.train_text_encoder or not args.cache_text_encoder_outputs
), "cache_text_encoder_outputs is not supported when training text encoder / text encoderを学習するときはcache_text_encoder_outputsはサポートされていません"
cache_latents = args.cache_latents
if args.seed is not None:
set_seed(args.seed) # 乱数系列を初期化する
tokenizer1, tokenizer2 = sdxl_train_util.load_tokenizers(args)
# データセットを準備する
if args.dataset_class is None:
blueprint_generator = BlueprintGenerator(ConfigSanitizer(True, True, False, True))
if args.dataset_config is not None:
print(f"Load dataset config from {args.dataset_config}")
user_config = config_util.load_user_config(args.dataset_config)
ignored = ["train_data_dir", "in_json"]
if any(getattr(args, attr) is not None for attr in ignored):
print(
"ignore following options because config file is found: {0} / 設定ファイルが利用されるため以下のオプションは無視されます: {0}".format(
", ".join(ignored)
)
)
else:
user_config = {
"datasets": [
{
"subsets": [
{
"image_dir": args.train_data_dir,
"metadata_file": args.in_json,
}
]
}
]
}
blueprint = blueprint_generator.generate(user_config, args, tokenizer=[tokenizer1, tokenizer2])
train_dataset_group = config_util.generate_dataset_group_by_blueprint(blueprint.dataset_group)
else:
train_dataset_group = train_util.load_arbitrary_dataset(args, [tokenizer1, tokenizer2])
current_epoch = Value("i", 0)
current_step = Value("i", 0)
ds_for_collater = train_dataset_group if args.max_data_loader_n_workers == 0 else None
collater = train_util.collater_class(current_epoch, current_step, ds_for_collater)
if args.debug_dataset:
train_util.debug_dataset(train_dataset_group, True)
return
if len(train_dataset_group) == 0:
print(
"No data found. Please verify the metadata file and train_data_dir option. / 画像がありません。メタデータおよびtrain_data_dirオプションを確認してください。"
)
return
if cache_latents:
assert (
train_dataset_group.is_latent_cacheable()
), "when caching latents, either color_aug or random_crop cannot be used / latentをキャッシュするときはcolor_augとrandom_cropは使えません"
if args.cache_text_encoder_outputs:
assert (
train_dataset_group.is_text_encoder_output_cacheable()
), "when caching text encoder output, either caption_dropout_rate, shuffle_caption, token_warmup_step or caption_tag_dropout_rate cannot be used / text encoderの出力をキャッシュするときはcaption_dropout_rate, shuffle_caption, token_warmup_step, caption_tag_dropout_rateは使えません"
# acceleratorを準備する
print("prepare accelerator")
accelerator = train_util.prepare_accelerator(args)
# mixed precisionに対応した型を用意しておき適宜castする
weight_dtype, save_dtype = train_util.prepare_dtype(args)
# モデルを読み込む
(
load_stable_diffusion_format,
text_encoder1,
text_encoder2,
vae,
unet,
text_projection,
logit_scale,
ckpt_info,
) = sdxl_train_util.load_target_model(args, accelerator, "sdxl", weight_dtype)
text_projection = text_projection.to(accelerator.device, dtype=weight_dtype)
logit_scale = logit_scale.to(accelerator.device, dtype=weight_dtype)
# verify load/save model formats
if load_stable_diffusion_format:
src_stable_diffusion_ckpt = args.pretrained_model_name_or_path
src_diffusers_model_path = None
else:
src_stable_diffusion_ckpt = None
src_diffusers_model_path = args.pretrained_model_name_or_path
if args.save_model_as is None:
save_stable_diffusion_format = load_stable_diffusion_format
use_safetensors = args.use_safetensors
else:
save_stable_diffusion_format = args.save_model_as.lower() == "ckpt" or args.save_model_as.lower() == "safetensors"
use_safetensors = args.use_safetensors or ("safetensors" in args.save_model_as.lower())
assert save_stable_diffusion_format, "save_model_as must be ckpt or safetensors / save_model_asはckptかsafetensorsである必要があります"
# Diffusers版のxformers使用フラグを設定する関数
def set_diffusers_xformers_flag(model, valid):
def fn_recursive_set_mem_eff(module: torch.nn.Module):
if hasattr(module, "set_use_memory_efficient_attention_xformers"):
module.set_use_memory_efficient_attention_xformers(valid)
for child in module.children():
fn_recursive_set_mem_eff(child)
fn_recursive_set_mem_eff(model)
# モデルに xformers とか memory efficient attention を組み込む
if args.diffusers_xformers:
# もうU-Netを独自にしたので動かないけどVAEのxformersは動くはず
accelerator.print("Use xformers by Diffusers")
# set_diffusers_xformers_flag(unet, True)
set_diffusers_xformers_flag(vae, True)
else:
# Windows版のxformersはfloatで学習できなかったりxformersを使わない設定も可能にしておく必要がある
accelerator.print("Disable Diffusers' xformers")
train_util.replace_unet_modules(unet, args.mem_eff_attn, args.xformers, args.sdpa)
vae.set_use_memory_efficient_attention_xformers(args.xformers)
# 学習を準備する
if cache_latents:
# vae.to(accelerator.device, dtype=weight_dtype)
vae.to(accelerator.device, dtype=torch.float32) # VAE in float to avoid NaN
vae.requires_grad_(False)
vae.eval()
with torch.no_grad():
train_dataset_group.cache_latents(vae, args.vae_batch_size, args.cache_latents_to_disk, accelerator.is_main_process)
vae.to("cpu")
if torch.cuda.is_available():
torch.cuda.empty_cache()
gc.collect()
accelerator.wait_for_everyone()
# 学習を準備する:モデルを適切な状態にする
training_models = []
if args.gradient_checkpointing:
unet.enable_gradient_checkpointing()
training_models.append(unet)
if args.train_text_encoder:
# TODO each option for two text encoders?
accelerator.print("enable text encoder training")
if args.gradient_checkpointing:
text_encoder1.gradient_checkpointing_enable()
text_encoder2.gradient_checkpointing_enable()
training_models.append(text_encoder1)
training_models.append(text_encoder2)
else:
text_encoder1.requires_grad_(False)
text_encoder2.requires_grad_(False)
text_encoder1.eval()
text_encoder2.eval()
if not cache_latents:
vae.requires_grad_(False)
vae.eval()
vae.to(accelerator.device, dtype=weight_dtype)
for m in training_models:
m.requires_grad_(True)
params = []
for m in training_models:
params.extend(m.parameters())
params_to_optimize = params
# calculate number of trainable parameters
n_params = 0
for p in params:
n_params += p.numel()
accelerator.print(f"number of models: {len(training_models)}")
accelerator.print(f"number of trainable parameters: {n_params}")
# 学習に必要なクラスを準備する
accelerator.print("prepare optimizer, data loader etc.")
_, _, optimizer = train_util.get_optimizer(args, trainable_params=params_to_optimize)
# dataloaderを準備する
# DataLoaderのプロセス数0はメインプロセスになる
n_workers = min(args.max_data_loader_n_workers, os.cpu_count() - 1) # cpu_count-1 ただし最大で指定された数まで
train_dataloader = torch.utils.data.DataLoader(
train_dataset_group,
batch_size=1,
shuffle=True,
collate_fn=collater,
num_workers=n_workers,
persistent_workers=args.persistent_data_loader_workers,
)
# 学習ステップ数を計算する
if args.max_train_epochs is not None:
args.max_train_steps = args.max_train_epochs * math.ceil(
len(train_dataloader) / accelerator.num_processes / args.gradient_accumulation_steps
)
accelerator.print(f"override steps. steps for {args.max_train_epochs} epochs is / 指定エポックまでのステップ数: {args.max_train_steps}")
# データセット側にも学習ステップを送信
train_dataset_group.set_max_train_steps(args.max_train_steps)
# lr schedulerを用意する
lr_scheduler = train_util.get_scheduler_fix(args, optimizer, accelerator.num_processes)
# 実験的機能勾配も含めたfp16学習を行う モデル全体をfp16にする
if args.full_fp16:
assert (
args.mixed_precision == "fp16"
), "full_fp16 requires mixed precision='fp16' / full_fp16を使う場合はmixed_precision='fp16'を指定してください。"
accelerator.print("enable full fp16 training.")
unet.to(weight_dtype)
text_encoder1.to(weight_dtype)
text_encoder2.to(weight_dtype)
# acceleratorがなんかよろしくやってくれるらしい
if args.train_text_encoder:
unet, text_encoder1, text_encoder2, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(
unet, text_encoder1, text_encoder2, optimizer, train_dataloader, lr_scheduler
)
# transform DDP after prepare
text_encoder1, text_encoder2, unet = train_util.transform_models_if_DDP([text_encoder1, text_encoder2, unet])
else:
unet, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(unet, optimizer, train_dataloader, lr_scheduler)
(unet,) = train_util.transform_models_if_DDP([unet])
text_encoder1.to(weight_dtype)
text_encoder2.to(weight_dtype)
text_encoder1.eval()
text_encoder2.eval()
# TextEncoderの出力をキャッシュする
if args.cache_text_encoder_outputs:
text_encoder1_cache, text_encoder2_cache = sdxl_train_util.cache_text_encoder_outputs(
args, accelerator, (tokenizer1, tokenizer2), (text_encoder1, text_encoder2), train_dataloader, None
)
accelerator.wait_for_everyone()
text_encoder1.to("cpu")
text_encoder2.to("cpu")
if torch.cuda.is_available():
torch.cuda.empty_cache()
else:
text_encoder1_cache = None
text_encoder2_cache = None
text_encoder1.to(accelerator.device)
text_encoder2.to(accelerator.device)
# 実験的機能勾配も含めたfp16学習を行う PyTorchにパッチを当ててfp16でのgrad scaleを有効にする
if args.full_fp16:
train_util.patch_accelerator_for_fp16_training(accelerator)
# resumeする
train_util.resume_from_local_or_hf_if_specified(accelerator, args)
# epoch数を計算する
num_update_steps_per_epoch = math.ceil(len(train_dataloader) / args.gradient_accumulation_steps)
num_train_epochs = math.ceil(args.max_train_steps / num_update_steps_per_epoch)
if (args.save_n_epoch_ratio is not None) and (args.save_n_epoch_ratio > 0):
args.save_every_n_epochs = math.floor(num_train_epochs / args.save_n_epoch_ratio) or 1
# 学習する
total_batch_size = args.train_batch_size * accelerator.num_processes * args.gradient_accumulation_steps
accelerator.print("running training / 学習開始")
accelerator.print(f" num examples / サンプル数: {train_dataset_group.num_train_images}")
accelerator.print(f" num batches per epoch / 1epochのバッチ数: {len(train_dataloader)}")
accelerator.print(f" num epochs / epoch数: {num_train_epochs}")
accelerator.print(f" batch size per device / バッチサイズ: {args.train_batch_size}")
accelerator.print(
f" total train batch size (with parallel & distributed & accumulation) / 総バッチサイズ(並列学習、勾配合計含む): {total_batch_size}"
)
accelerator.print(f" gradient accumulation steps / 勾配を合計するステップ数 = {args.gradient_accumulation_steps}")
accelerator.print(f" total optimization steps / 学習ステップ数: {args.max_train_steps}")
progress_bar = tqdm(range(args.max_train_steps), smoothing=0, disable=not accelerator.is_local_main_process, desc="steps")
global_step = 0
noise_scheduler = DDPMScheduler(
beta_start=0.00085, beta_end=0.012, beta_schedule="scaled_linear", num_train_timesteps=1000, clip_sample=False
)
prepare_scheduler_for_custom_training(noise_scheduler, accelerator.device)
if accelerator.is_main_process:
accelerator.init_trackers("finetuning" if args.log_tracker_name is None else args.log_tracker_name)
for epoch in range(num_train_epochs):
accelerator.print(f"\nepoch {epoch+1}/{num_train_epochs}")
current_epoch.value = epoch + 1
for m in training_models:
m.train()
loss_total = 0
for step, batch in enumerate(train_dataloader):
current_step.value = global_step
# with accelerator.accumulate(training_models[0]): # 複数モデルに対応していない模様だがとりあえずこうしておく
if True:
if "latents" in batch and batch["latents"] is not None:
latents = batch["latents"].to(accelerator.device).to(dtype=weight_dtype)
else:
with torch.no_grad():
# latentに変換
# latents = vae.encode(batch["images"].to(dtype=weight_dtype)).latent_dist.sample()
latents = vae.encode(batch["images"].to(torch.float32)).latent_dist.sample().to(weight_dtype)
latents = latents * sdxl_model_util.VAE_SCALE_FACTOR
b_size = latents.shape[0]
input_ids1 = batch["input_ids"]
input_ids2 = batch["input_ids2"]
if not args.cache_text_encoder_outputs:
with torch.set_grad_enabled(args.train_text_encoder):
# Get the text embedding for conditioning
# TODO support weighted captions
# if args.weighted_captions:
# encoder_hidden_states = get_weighted_text_embeddings(
# tokenizer,
# text_encoder,
# batch["captions"],
# accelerator.device,
# args.max_token_length // 75 if args.max_token_length else 1,
# clip_skip=args.clip_skip,
# )
# else:
input_ids1 = input_ids1.to(accelerator.device)
input_ids2 = input_ids2.to(accelerator.device)
encoder_hidden_states1, encoder_hidden_states2, pool2 = sdxl_train_util.get_hidden_states(
args,
input_ids1,
input_ids2,
tokenizer1,
tokenizer2,
text_encoder1,
text_encoder2,
None if not args.full_fp16 else weight_dtype,
)
pool2 = pool2 @ text_projection.to(pool2.dtype)
else:
encoder_hidden_states1 = []
encoder_hidden_states2 = []
pool2 = []
for input_id1, input_id2 in zip(input_ids1, input_ids2):
input_id1 = input_id1.squeeze(0)
input_id2 = input_id2.squeeze(0)
encoder_hidden_states1.append(text_encoder1_cache[tuple(input_id1.tolist())])
hidden_states2, p2 = text_encoder2_cache[tuple(input_id2.tolist())]
encoder_hidden_states2.append(hidden_states2)
pool2.append(p2)
encoder_hidden_states1 = torch.stack(encoder_hidden_states1).to(accelerator.device).to(weight_dtype)
encoder_hidden_states2 = torch.stack(encoder_hidden_states2).to(accelerator.device).to(weight_dtype)
pool2 = torch.stack(pool2).to(accelerator.device).to(weight_dtype)
pool2 = pool2 @ text_projection.to(pool2.dtype)
# get size embeddings
orig_size = batch["original_sizes_hw"]
crop_size = batch["crop_top_lefts"]
target_size = batch["target_sizes_hw"]
embs = sdxl_train_util.get_size_embeddings(orig_size, crop_size, target_size, accelerator.device).to(weight_dtype)
# concat embeddings
vector_embedding = torch.cat([pool2, embs], dim=1).to(weight_dtype)
text_embedding = torch.cat([encoder_hidden_states1, encoder_hidden_states2], dim=2).to(weight_dtype)
# Sample noise that we'll add to the latents
noise = torch.randn_like(latents, device=latents.device)
if args.noise_offset:
noise = apply_noise_offset(latents, noise, args.noise_offset, args.adaptive_noise_scale)
elif args.multires_noise_iterations:
noise = pyramid_noise_like(noise, latents.device, args.multires_noise_iterations, args.multires_noise_discount)
# Sample a random timestep for each image
timesteps = torch.randint(0, noise_scheduler.config.num_train_timesteps, (b_size,), 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(weight_dtype) # TODO check why noisy_latents is not weight_dtype
# Predict the noise residual
with accelerator.autocast():
noise_pred = unet(noisy_latents, timesteps, text_embedding, vector_embedding)
target = noise
if args.min_snr_gamma:
# do not mean over batch dimension for snr weight or scale v-pred loss
loss = torch.nn.functional.mse_loss(noise_pred.float(), target.float(), reduction="none")
loss = loss.mean([1, 2, 3])
if args.min_snr_gamma:
loss = apply_snr_weight(loss, timesteps, noise_scheduler, args.min_snr_gamma)
loss = loss.mean() # mean over batch dimension
else:
loss = torch.nn.functional.mse_loss(noise_pred.float(), target.float(), reduction="mean")
accelerator.backward(loss)
if accelerator.sync_gradients and args.max_grad_norm != 0.0:
params_to_clip = []
for m in training_models:
params_to_clip.extend(m.parameters())
accelerator.clip_grad_norm_(params_to_clip, args.max_grad_norm)
optimizer.step()
lr_scheduler.step()
optimizer.zero_grad(set_to_none=True)
# Checks if the accelerator has performed an optimization step behind the scenes
if accelerator.sync_gradients:
progress_bar.update(1)
global_step += 1
# sdxl_train_util.sample_images(
# accelerator,
# args,
# None,
# global_step,
# accelerator.device,
# vae,
# tokenizer1,
# tokenizer2,
# text_encoder1,
# text_encoder2,
# unet,
# )
# 指定ステップごとにモデルを保存
if args.save_every_n_steps is not None and global_step % args.save_every_n_steps == 0:
accelerator.wait_for_everyone()
if accelerator.is_main_process:
src_path = src_stable_diffusion_ckpt if save_stable_diffusion_format else src_diffusers_model_path
sdxl_train_util.save_sd_model_on_epoch_end_or_stepwise(
args,
False,
accelerator,
src_path,
save_stable_diffusion_format,
use_safetensors,
save_dtype,
epoch,
num_train_epochs,
global_step,
accelerator.unwrap_model(text_encoder1),
accelerator.unwrap_model(text_encoder2),
accelerator.unwrap_model(unet),
vae,
text_projection,
logit_scale,
ckpt_info,
)
current_loss = loss.detach().item() # 平均なのでbatch sizeは関係ないはず
if args.logging_dir is not None:
logs = {"loss": current_loss, "lr": float(lr_scheduler.get_last_lr()[0])}
if (
args.optimizer_type.lower().startswith("DAdapt".lower()) or args.optimizer_type.lower() == "Prodigy"
): # tracking d*lr value
logs["lr/d*lr"] = (
lr_scheduler.optimizers[0].param_groups[0]["d"] * lr_scheduler.optimizers[0].param_groups[0]["lr"]
)
accelerator.log(logs, step=global_step)
# TODO moving averageにする
loss_total += current_loss
avr_loss = loss_total / (step + 1)
logs = {"loss": avr_loss} # , "lr": lr_scheduler.get_last_lr()[0]}
progress_bar.set_postfix(**logs)
if global_step >= args.max_train_steps:
break
if args.logging_dir is not None:
logs = {"loss/epoch": loss_total / len(train_dataloader)}
accelerator.log(logs, step=epoch + 1)
accelerator.wait_for_everyone()
if args.save_every_n_epochs is not None:
if accelerator.is_main_process:
src_path = src_stable_diffusion_ckpt if save_stable_diffusion_format else src_diffusers_model_path
sdxl_train_util.save_sd_model_on_epoch_end_or_stepwise(
args,
True,
accelerator,
src_path,
save_stable_diffusion_format,
use_safetensors,
save_dtype,
epoch,
num_train_epochs,
global_step,
accelerator.unwrap_model(text_encoder1),
accelerator.unwrap_model(text_encoder2),
accelerator.unwrap_model(unet),
vae,
text_projection,
logit_scale,
ckpt_info,
)
# train_util.sample_images(accelerator, args, epoch + 1, global_step, accelerator.device, vae, tokenizer, text_encoder, unet)
is_main_process = accelerator.is_main_process
# if is_main_process:
unet = accelerator.unwrap_model(unet)
text_encoder1 = accelerator.unwrap_model(text_encoder1)
text_encoder2 = accelerator.unwrap_model(text_encoder2)
accelerator.end_training()
if args.save_state: # and is_main_process:
train_util.save_state_on_train_end(args, accelerator)
del accelerator # この後メモリを使うのでこれは消す
if is_main_process:
src_path = src_stable_diffusion_ckpt if save_stable_diffusion_format else src_diffusers_model_path
sdxl_train_util.save_sd_model_on_train_end(
args,
src_path,
save_stable_diffusion_format,
use_safetensors,
save_dtype,
epoch,
global_step,
text_encoder1,
text_encoder2,
unet,
vae,
text_projection,
logit_scale,
ckpt_info,
)
print("model saved.")
def setup_parser() -> argparse.ArgumentParser:
parser = argparse.ArgumentParser()
train_util.add_sd_models_arguments(parser)
train_util.add_dataset_arguments(parser, True, True, True)
train_util.add_training_arguments(parser, False)
train_util.add_sd_saving_arguments(parser)
train_util.add_optimizer_arguments(parser)
config_util.add_config_arguments(parser)
custom_train_functions.add_custom_train_arguments(parser)
sdxl_train_util.add_sdxl_training_arguments(parser)
parser.add_argument("--diffusers_xformers", action="store_true", help="use xformers by diffusers / Diffusersでxformersを使用する")
parser.add_argument("--train_text_encoder", action="store_true", help="train text encoder / text encoderも学習する")
return parser
if __name__ == "__main__":
parser = setup_parser()
args = parser.parse_args()
args = train_util.read_config_from_file(args, parser)
train(args)