add fine tuning FLUX.1 (WIP)

flux_train.py

@@ -0,0 +1,729 @@
+# training with captions
+
+import argparse
+import copy
+import math
+import os
+from multiprocessing import Value
+from typing import List
+import toml
+
+from tqdm import tqdm
+
+import torch
+from library.device_utils import init_ipex, clean_memory_on_device
+
+init_ipex()
+
+from accelerate.utils import set_seed
+from library import deepspeed_utils, flux_train_utils, flux_utils, strategy_base, strategy_flux
+from library.sd3_train_utils import load_prompts, FlowMatchEulerDiscreteScheduler
+
+import library.train_util as train_util
+
+from library.utils import setup_logging, add_logging_arguments
+
+setup_logging()
+import logging
+
+logger = logging.getLogger(__name__)
+
+import library.config_util as config_util
+
+# import library.sdxl_train_util as sdxl_train_util
+from library.config_util import (
+    ConfigSanitizer,
+    BlueprintGenerator,
+)
+from library.custom_train_functions import apply_masked_loss, add_custom_train_arguments
+
+
+def train(args):
+    train_util.verify_training_args(args)
+    train_util.prepare_dataset_args(args, True)
+    # sdxl_train_util.verify_sdxl_training_args(args)
+    deepspeed_utils.prepare_deepspeed_args(args)
+    setup_logging(args, reset=True)
+
+    # 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"
+    if args.cache_text_encoder_outputs_to_disk and not args.cache_text_encoder_outputs:
+        logger.warning(
+            "cache_text_encoder_outputs_to_disk is enabled, so cache_text_encoder_outputs is also enabled / cache_text_encoder_outputs_to_diskが有効になっているため、cache_text_encoder_outputsも有効になります"
+        )
+        args.cache_text_encoder_outputs = True
+
+    cache_latents = args.cache_latents
+    use_dreambooth_method = args.in_json is None
+
+    if args.seed is not None:
+        set_seed(args.seed)  # 乱数系列を初期化する
+
+    # prepare caching strategy: this must be set before preparing dataset. because dataset may use this strategy for initialization.
+    if args.cache_latents:
+        latents_caching_strategy = strategy_flux.FluxLatentsCachingStrategy(
+            args.cache_latents_to_disk, args.vae_batch_size, args.skip_latents_validity_check
+        )
+        strategy_base.LatentsCachingStrategy.set_strategy(latents_caching_strategy)
+
+    # データセットを準備する
+    if args.dataset_class is None:
+        blueprint_generator = BlueprintGenerator(ConfigSanitizer(True, True, args.masked_loss, True))
+        if args.dataset_config is not None:
+            logger.info(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):
+                logger.warning(
+                    "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:
+            if use_dreambooth_method:
+                logger.info("Using DreamBooth method.")
+                user_config = {
+                    "datasets": [
+                        {
+                            "subsets": config_util.generate_dreambooth_subsets_config_by_subdirs(
+                                args.train_data_dir, args.reg_data_dir
+                            )
+                        }
+                    ]
+                }
+            else:
+                logger.info("Training with captions.")
+                user_config = {
+                    "datasets": [
+                        {
+                            "subsets": [
+                                {
+                                    "image_dir": args.train_data_dir,
+                                    "metadata_file": args.in_json,
+                                }
+                            ]
+                        }
+                    ]
+                }
+
+        blueprint = blueprint_generator.generate(user_config, args)
+        train_dataset_group = config_util.generate_dataset_group_by_blueprint(blueprint.dataset_group)
+    else:
+        train_dataset_group = train_util.load_arbitrary_dataset(args)
+
+    current_epoch = Value("i", 0)
+    current_step = Value("i", 0)
+    ds_for_collator = train_dataset_group if args.max_data_loader_n_workers == 0 else None
+    collator = train_util.collator_class(current_epoch, current_step, ds_for_collator)
+
+    train_dataset_group.verify_bucket_reso_steps(16)  # TODO これでいいか確認
+
+    if args.debug_dataset:
+        if args.cache_text_encoder_outputs:
+            strategy_base.TextEncoderOutputsCachingStrategy.set_strategy(
+                strategy_flux.FluxTextEncoderOutputsCachingStrategy(
+                    args.cache_text_encoder_outputs_to_disk, args.text_encoder_batch_size, False, False
+                )
+            )
+        train_dataset_group.set_current_strategies()
+        train_util.debug_dataset(train_dataset_group, True)
+        return
+    if len(train_dataset_group) == 0:
+        logger.error(
+            "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
+    logger.info("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
+    name = "schnell" if "schnell" in args.pretrained_model_name_or_path else "dev"
+
+    # load VAE for caching latents
+    ae = None
+    if cache_latents:
+        ae = flux_utils.load_ae(name, args.ae, weight_dtype, "cpu")
+        ae.to(accelerator.device, dtype=weight_dtype)
+        ae.requires_grad_(False)
+        ae.eval()
+
+        train_dataset_group.new_cache_latents(ae, accelerator.is_main_process)
+
+        ae.to("cpu")  # if no sampling, vae can be deleted
+        clean_memory_on_device(accelerator.device)
+
+        accelerator.wait_for_everyone()
+
+    # prepare tokenize strategy
+    if args.t5xxl_max_token_length is None:
+        if name == "schnell":
+            t5xxl_max_token_length = 256
+        else:
+            t5xxl_max_token_length = 512
+    else:
+        t5xxl_max_token_length = args.t5xxl_max_token_length
+
+    flux_tokenize_strategy = strategy_flux.FluxTokenizeStrategy(t5xxl_max_token_length)
+    strategy_base.TokenizeStrategy.set_strategy(flux_tokenize_strategy)
+
+    # load clip_l, t5xxl for caching text encoder outputs
+    clip_l = flux_utils.load_clip_l(args.clip_l, weight_dtype, "cpu")
+    t5xxl = flux_utils.load_t5xxl(args.t5xxl, weight_dtype, "cpu")
+    clip_l.eval()
+    t5xxl.eval()
+    clip_l.requires_grad_(False)
+    t5xxl.requires_grad_(False)
+
+    text_encoding_strategy = strategy_flux.FluxTextEncodingStrategy(args.apply_t5_attn_mask)
+    strategy_base.TextEncodingStrategy.set_strategy(text_encoding_strategy)
+
+    # cache text encoder outputs
+    sample_prompts_te_outputs = None
+    if args.cache_text_encoder_outputs:
+        # Text Encodes are eval and no grad here
+        clip_l.to(accelerator.device)
+        t5xxl.to(accelerator.device)
+
+        text_encoder_caching_strategy = strategy_flux.FluxTextEncoderOutputsCachingStrategy(
+            args.cache_text_encoder_outputs_to_disk, args.text_encoder_batch_size, False, False, args.apply_t5_attn_mask
+        )
+        strategy_base.TextEncoderOutputsCachingStrategy.set_strategy(text_encoder_caching_strategy)
+
+        with accelerator.autocast():
+            train_dataset_group.new_cache_text_encoder_outputs([clip_l, t5xxl], accelerator.is_main_process)
+
+        # cache sample prompt's embeddings to free text encoder's memory
+        if args.sample_prompts is not None:
+            logger.info(f"cache Text Encoder outputs for sample prompt: {args.sample_prompts}")
+
+            tokenize_strategy: strategy_flux.FluxTokenizeStrategy = strategy_base.TokenizeStrategy.get_strategy()
+            text_encoding_strategy: strategy_flux.FluxTextEncodingStrategy = strategy_base.TextEncodingStrategy.get_strategy()
+
+            prompts = load_prompts(args.sample_prompts)
+            sample_prompts_te_outputs = {}  # key: prompt, value: text encoder outputs
+            with accelerator.autocast(), torch.no_grad():
+                for prompt_dict in prompts:
+                    for p in [prompt_dict.get("prompt", ""), prompt_dict.get("negative_prompt", "")]:
+                        if p not in sample_prompts_te_outputs:
+                            logger.info(f"cache Text Encoder outputs for prompt: {p}")
+                            tokens_and_masks = tokenize_strategy.tokenize(p)
+                            sample_prompts_te_outputs[p] = text_encoding_strategy.encode_tokens(
+                                tokenize_strategy, [clip_l, t5xxl], tokens_and_masks, args.apply_t5_attn_mask
+                            )
+
+        accelerator.wait_for_everyone()
+
+        # now we can delete Text Encoders to free memory
+        clip_l = None
+        t5xxl = None
+
+    # load FLUX
+    # if we load to cpu, flux.to(fp8) takes a long time
+    flux = flux_utils.load_flow_model(name, args.pretrained_model_name_or_path, weight_dtype, "cpu")
+
+    if args.gradient_checkpointing:
+        flux.enable_gradient_checkpointing()
+
+    flux.requires_grad_(True)
+
+    if not cache_latents:
+        # load VAE here if not cached
+        ae = flux_utils.load_ae(name, args.ae, weight_dtype, "cpu")
+        ae.requires_grad_(False)
+        ae.eval()
+        ae.to(accelerator.device, dtype=weight_dtype)
+
+    training_models = []
+    params_to_optimize = []
+    training_models.append(flux)
+    params_to_optimize.append({"params": list(flux.parameters()), "lr": args.learning_rate})
+
+    # calculate number of trainable parameters
+    n_params = 0
+    for group in params_to_optimize:
+        for p in group["params"]:
+            n_params += p.numel()
+
+    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.")
+
+    if args.fused_optimizer_groups:
+        # fused backward pass: https://pytorch.org/tutorials/intermediate/optimizer_step_in_backward_tutorial.html
+        # Instead of creating an optimizer for all parameters as in the tutorial, we create an optimizer for each group of parameters.
+        # This balances memory usage and management complexity.
+
+        # calculate total number of parameters
+        n_total_params = sum(len(params["params"]) for params in params_to_optimize)
+        params_per_group = math.ceil(n_total_params / args.fused_optimizer_groups)
+
+        # split params into groups, keeping the learning rate the same for all params in a group
+        # this will increase the number of groups if the learning rate is different for different params (e.g. U-Net and text encoders)
+        grouped_params = []
+        param_group = []
+        param_group_lr = -1
+        for group in params_to_optimize:
+            lr = group["lr"]
+            for p in group["params"]:
+                # if the learning rate is different for different params, start a new group
+                if lr != param_group_lr:
+                    if param_group:
+                        grouped_params.append({"params": param_group, "lr": param_group_lr})
+                        param_group = []
+                    param_group_lr = lr
+
+                param_group.append(p)
+
+                # if the group has enough parameters, start a new group
+                if len(param_group) == params_per_group:
+                    grouped_params.append({"params": param_group, "lr": param_group_lr})
+                    param_group = []
+                    param_group_lr = -1
+
+        if param_group:
+            grouped_params.append({"params": param_group, "lr": param_group_lr})
+
+        # prepare optimizers for each group
+        optimizers = []
+        for group in grouped_params:
+            _, _, optimizer = train_util.get_optimizer(args, trainable_params=[group])
+            optimizers.append(optimizer)
+        optimizer = optimizers[0]  # avoid error in the following code
+
+        logger.info(f"using {len(optimizers)} optimizers for fused optimizer groups")
+
+    else:
+        _, _, optimizer = train_util.get_optimizer(args, trainable_params=params_to_optimize)
+
+    # prepare dataloader
+    # strategies are set here because they cannot be referenced in another process. Copy them with the dataset
+    # some strategies can be None
+    train_dataset_group.set_current_strategies()
+
+    # DataLoaderのプロセス数：0 は persistent_workers が使えないので注意
+    n_workers = min(args.max_data_loader_n_workers, os.cpu_count())  # cpu_count or max_data_loader_n_workers
+    train_dataloader = torch.utils.data.DataLoader(
+        train_dataset_group,
+        batch_size=1,
+        shuffle=True,
+        collate_fn=collator,
+        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
+    if args.fused_optimizer_groups:
+        # prepare lr schedulers for each optimizer
+        lr_schedulers = [train_util.get_scheduler_fix(args, optimizer, accelerator.num_processes) for optimizer in optimizers]
+        lr_scheduler = lr_schedulers[0]  # avoid error in the following code
+    else:
+        lr_scheduler = train_util.get_scheduler_fix(args, optimizer, accelerator.num_processes)
+
+    # 実験的機能：勾配も含めたfp16/bf16学習を行う　モデル全体をfp16/bf16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.")
+        flux.to(weight_dtype)
+        if clip_l is not None:
+            clip_l.to(weight_dtype)
+            t5xxl.to(weight_dtype)  # TODO check works with fp16 or not
+    elif args.full_bf16:
+        assert (
+            args.mixed_precision == "bf16"
+        ), "full_bf16 requires mixed precision='bf16' / full_bf16を使う場合はmixed_precision='bf16'を指定してください。"
+        accelerator.print("enable full bf16 training.")
+        flux.to(weight_dtype)
+        if clip_l is not None:
+            clip_l.to(weight_dtype)
+            t5xxl.to(weight_dtype)
+
+    # if we don't cache text encoder outputs, move them to device
+    if not args.cache_text_encoder_outputs:
+        clip_l.to(accelerator.device)
+        t5xxl.to(accelerator.device)
+
+    clean_memory_on_device(accelerator.device)
+
+    if args.deepspeed:
+        ds_model = deepspeed_utils.prepare_deepspeed_model(args, mmdit=flux)
+        # most of ZeRO stage uses optimizer partitioning, so we have to prepare optimizer and ds_model at the same time. # pull/1139#issuecomment-1986790007
+        ds_model, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(
+            ds_model, optimizer, train_dataloader, lr_scheduler
+        )
+        training_models = [ds_model]
+
+    else:
+        # acceleratorがなんかよろしくやってくれるらしい
+        flux = accelerator.prepare(flux)
+        optimizer, train_dataloader, lr_scheduler = accelerator.prepare(optimizer, train_dataloader, lr_scheduler)
+
+    # 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:
+        # During deepseed training, accelerate not handles fp16/bf16|mixed precision directly via scaler. Let deepspeed engine do.
+        # -> But we think it's ok to patch accelerator even if deepspeed is enabled.
+        train_util.patch_accelerator_for_fp16_training(accelerator)
+
+    # resumeする
+    train_util.resume_from_local_or_hf_if_specified(accelerator, args)
+
+    if args.fused_backward_pass:
+        # use fused optimizer for backward pass: other optimizers will be supported in the future
+        import library.adafactor_fused
+
+        library.adafactor_fused.patch_adafactor_fused(optimizer)
+        for param_group in optimizer.param_groups:
+            for parameter in param_group["params"]:
+                if parameter.requires_grad:
+
+                    def __grad_hook(tensor: torch.Tensor, param_group=param_group):
+                        if accelerator.sync_gradients and args.max_grad_norm != 0.0:
+                            accelerator.clip_grad_norm_(tensor, args.max_grad_norm)
+                        optimizer.step_param(tensor, param_group)
+                        tensor.grad = None
+
+                    parameter.register_post_accumulate_grad_hook(__grad_hook)
+
+    elif args.fused_optimizer_groups:
+        # prepare for additional optimizers and lr schedulers
+        for i in range(1, len(optimizers)):
+            optimizers[i] = accelerator.prepare(optimizers[i])
+            lr_schedulers[i] = accelerator.prepare(lr_schedulers[i])
+
+        # counters are used to determine when to step the optimizer
+        global optimizer_hooked_count
+        global num_parameters_per_group
+        global parameter_optimizer_map
+
+        optimizer_hooked_count = {}
+        num_parameters_per_group = [0] * len(optimizers)
+        parameter_optimizer_map = {}
+
+        for opt_idx, optimizer in enumerate(optimizers):
+            for param_group in optimizer.param_groups:
+                for parameter in param_group["params"]:
+                    if parameter.requires_grad:
+
+                        def optimizer_hook(parameter: torch.Tensor):
+                            if accelerator.sync_gradients and args.max_grad_norm != 0.0:
+                                accelerator.clip_grad_norm_(parameter, args.max_grad_norm)
+
+                            i = parameter_optimizer_map[parameter]
+                            optimizer_hooked_count[i] += 1
+                            if optimizer_hooked_count[i] == num_parameters_per_group[i]:
+                                optimizers[i].step()
+                                optimizers[i].zero_grad(set_to_none=True)
+
+                        parameter.register_post_accumulate_grad_hook(optimizer_hook)
+                        parameter_optimizer_map[parameter] = opt_idx
+                        num_parameters_per_group[opt_idx] += 1
+
+    # 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: {', '.join([str(d.batch_size) for d in train_dataset_group.datasets])}"
+    )
+    # 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 = FlowMatchEulerDiscreteScheduler(num_train_timesteps=1000, shift=args.discrete_flow_shift)
+    noise_scheduler_copy = copy.deepcopy(noise_scheduler)
+
+    if accelerator.is_main_process:
+        init_kwargs = {}
+        if args.wandb_run_name:
+            init_kwargs["wandb"] = {"name": args.wandb_run_name}
+        if args.log_tracker_config is not None:
+            init_kwargs = toml.load(args.log_tracker_config)
+        accelerator.init_trackers(
+            "finetuning" if args.log_tracker_name is None else args.log_tracker_name,
+            config=train_util.get_sanitized_config_or_none(args),
+            init_kwargs=init_kwargs,
+        )
+
+    # For --sample_at_first
+    flux_train_utils.sample_images(accelerator, args, 0, global_step, flux, ae, [clip_l, t5xxl], sample_prompts_te_outputs)
+
+    loss_recorder = train_util.LossRecorder()
+    epoch = 0  # avoid error when max_train_steps is 0
+    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()
+
+        for step, batch in enumerate(train_dataloader):
+            current_step.value = global_step
+
+            if args.fused_optimizer_groups:
+                optimizer_hooked_count = {i: 0 for i in range(len(optimizers))}  # reset counter for each step
+
+            with accelerator.accumulate(*training_models):
+                if "latents" in batch and batch["latents"] is not None:
+                    latents = batch["latents"].to(accelerator.device, dtype=weight_dtype)
+                else:
+                    with torch.no_grad():
+                        # encode images to latents. images are [-1, 1]
+                        latents = ae.encode(batch["images"])
+
+                    # NaNが含まれていれば警告を表示し0に置き換える
+                    if torch.any(torch.isnan(latents)):
+                        accelerator.print("NaN found in latents, replacing with zeros")
+                        latents = torch.nan_to_num(latents, 0, out=latents)
+
+                text_encoder_outputs_list = batch.get("text_encoder_outputs_list", None)
+                if text_encoder_outputs_list is not None:
+                    text_encoder_conds = text_encoder_outputs_list
+                else:
+                    # not cached or training, so get from text encoders
+                    tokens_and_masks = batch["input_ids_list"]
+                    with torch.no_grad():
+                        input_ids = [ids.to(accelerator.device) for ids in batch["input_ids_list"]]
+                        text_encoder_conds = text_encoding_strategy.encode_tokens(
+                            tokenize_strategy, [clip_l, t5xxl], input_ids, args.apply_t5_attn_mask
+                        )
+                        if args.full_fp16:
+                            text_encoder_conds = [c.to(weight_dtype) for c in text_encoder_conds]
+
+                # TODO support some features for noise implemented in get_noise_noisy_latents_and_timesteps
+
+                # Sample noise that we'll add to the latents
+                noise = torch.randn_like(latents)
+                bsz = latents.shape[0]
+
+                # get noisy model input and timesteps
+                noisy_model_input, timesteps, sigmas = flux_train_utils.get_noisy_model_input_and_timesteps(
+                    args, noise_scheduler, latents, noise, accelerator.device, weight_dtype
+                )
+
+                # pack latents and get img_ids
+                packed_noisy_model_input = flux_utils.pack_latents(noisy_model_input)  # b, c, h*2, w*2 -> b, h*w, c*4
+                packed_latent_height, packed_latent_width = noisy_model_input.shape[2] // 2, noisy_model_input.shape[3] // 2
+                img_ids = flux_utils.prepare_img_ids(bsz, packed_latent_height, packed_latent_width).to(device=accelerator.device)
+
+                # get guidance
+                guidance_vec = torch.full((bsz,), args.guidance_scale, device=accelerator.device)
+
+                # call model
+                l_pooled, t5_out, txt_ids = text_encoder_conds
+                with accelerator.autocast():
+                    # YiYi notes: divide it by 1000 for now because we scale it by 1000 in the transformer model (we should not keep it but I want to keep the inputs same for the model for testing)
+                    model_pred = flux(
+                        img=packed_noisy_model_input,
+                        img_ids=img_ids,
+                        txt=t5_out,
+                        txt_ids=txt_ids,
+                        y=l_pooled,
+                        timesteps=timesteps / 1000,
+                        guidance=guidance_vec,
+                    )
+
+                # unpack latents
+                model_pred = flux_utils.unpack_latents(model_pred, packed_latent_height, packed_latent_width)
+
+                # apply model prediction type
+                model_pred, weighting = flux_train_utils.apply_model_prediction_type(args, model_pred, noisy_model_input, sigmas)
+
+                # flow matching loss: this is different from SD3
+                target = noise - latents
+
+                # calculate loss
+                loss = train_util.conditional_loss(
+                    model_pred.float(), target.float(), reduction="none", loss_type=args.loss_type, huber_c=None
+                )
+                if weighting is not None:
+                    loss = loss * weighting
+                if args.masked_loss or ("alpha_masks" in batch and batch["alpha_masks"] is not None):
+                    loss = apply_masked_loss(loss, batch)
+                loss = loss.mean([1, 2, 3])
+
+                loss_weights = batch["loss_weights"]  # 各sampleごとのweight
+                loss = loss * loss_weights
+                loss = loss.mean()
+
+                # backward
+                accelerator.backward(loss)
+
+                if not (args.fused_backward_pass or args.fused_optimizer_groups):
+                    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)
+                else:
+                    # optimizer.step() and optimizer.zero_grad() are called in the optimizer hook
+                    lr_scheduler.step()
+                    if args.fused_optimizer_groups:
+                        for i in range(1, len(optimizers)):
+                            lr_schedulers[i].step()
+
+            # Checks if the accelerator has performed an optimization step behind the scenes
+            if accelerator.sync_gradients:
+                progress_bar.update(1)
+                global_step += 1
+
+                flux_train_utils.sample_images(
+                    accelerator, args, epoch, global_step, flux, ae, [clip_l, t5xxl], sample_prompts_te_outputs
+                )
+
+                # 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:
+                        flux_train_utils.save_flux_model_on_epoch_end_or_stepwise(
+                            args,
+                            False,
+                            accelerator,
+                            save_dtype,
+                            epoch,
+                            num_train_epochs,
+                            global_step,
+                            accelerator.unwrap_model(flux),
+                        )
+
+            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}
+                train_util.append_lr_to_logs(logs, lr_scheduler, args.optimizer_type, including_unet=True)
+
+                accelerator.log(logs, step=global_step)
+
+            loss_recorder.add(epoch=epoch, step=step, loss=current_loss)
+            avr_loss: float = loss_recorder.moving_average
+            logs = {"avr_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_recorder.moving_average}
+            accelerator.log(logs, step=epoch + 1)
+
+        accelerator.wait_for_everyone()
+
+        if args.save_every_n_epochs is not None:
+            if accelerator.is_main_process:
+                flux_train_utils.save_flux_model_on_epoch_end_or_stepwise(
+                    args,
+                    True,
+                    accelerator,
+                    save_dtype,
+                    epoch,
+                    num_train_epochs,
+                    global_step,
+                    accelerator.unwrap_model(flux),
+                )
+
+        flux_train_utils.sample_images(
+            accelerator, args, epoch + 1, global_step, flux, ae, [clip_l, t5xxl], sample_prompts_te_outputs
+        )
+
+    is_main_process = accelerator.is_main_process
+    # if is_main_process:
+    flux = accelerator.unwrap_model(flux)
+    clip_l = accelerator.unwrap_model(clip_l)
+    clip_g = accelerator.unwrap_model(clip_g)
+    if t5xxl is not None:
+        t5xxl = accelerator.unwrap_model(t5xxl)
+
+    accelerator.end_training()
+
+    if args.save_state or args.save_state_on_train_end:
+        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:
+        flux_train_utils.save_flux_model_on_train_end(args, save_dtype, epoch, global_step, flux, ae)
+        logger.info("model saved.")
+
+
+def setup_parser() -> argparse.ArgumentParser:
+    parser = argparse.ArgumentParser()
+
+    add_logging_arguments(parser)
+    train_util.add_sd_models_arguments(parser)  # TODO split this
+    train_util.add_dataset_arguments(parser, True, True, True)
+    train_util.add_training_arguments(parser, False)
+    train_util.add_masked_loss_arguments(parser)
+    deepspeed_utils.add_deepspeed_arguments(parser)
+    train_util.add_sd_saving_arguments(parser)
+    train_util.add_optimizer_arguments(parser)
+    config_util.add_config_arguments(parser)
+    add_custom_train_arguments(parser)  # TODO remove this from here
+    flux_train_utils.add_flux_train_arguments(parser)
+
+    parser.add_argument(
+        "--fused_optimizer_groups",
+        type=int,
+        default=None,
+        help="number of optimizers for fused backward pass and optimizer step / fused backward passとoptimizer stepのためのoptimizer数",
+    )
+    parser.add_argument(
+        "--skip_latents_validity_check",
+        action="store_true",
+        help="skip latents validity check / latentsの正当性チェックをスキップする",
+    )
+    return parser
+
+
+if __name__ == "__main__":
+    parser = setup_parser()
+
+    args = parser.parse_args()
+    train_util.verify_command_line_training_args(args)
+    args = train_util.read_config_from_file(args, parser)
+
+    train(args)

flux_train_network.py

@@ -274,85 +274,14 @@ class FluxNetworkTrainer(train_network.NetworkTrainer):
         weight_dtype,
         train_unet,
     ):
-        # copy from sd3_train.py and modified
-
-        def get_sigmas(timesteps, n_dim=4, dtype=torch.float32):
-            sigmas = self.noise_scheduler_copy.sigmas.to(device=accelerator.device, dtype=dtype)
-            schedule_timesteps = self.noise_scheduler_copy.timesteps.to(accelerator.device)
-            timesteps = timesteps.to(accelerator.device)
-            step_indices = [(schedule_timesteps == t).nonzero().item() for t in timesteps]
-
-            sigma = sigmas[step_indices].flatten()
-            while len(sigma.shape) < n_dim:
-                sigma = sigma.unsqueeze(-1)
-            return sigma
-
-        def compute_density_for_timestep_sampling(
-            weighting_scheme: str, batch_size: int, logit_mean: float = None, logit_std: float = None, mode_scale: float = None
-        ):
-            """Compute the density for sampling the timesteps when doing SD3 training.
-
-            Courtesy: This was contributed by Rafie Walker in https://github.com/huggingface/diffusers/pull/8528.
-
-            SD3 paper reference: https://arxiv.org/abs/2403.03206v1.
-            """
-            if weighting_scheme == "logit_normal":
-                # See 3.1 in the SD3 paper ($rf/lognorm(0.00,1.00)$).
-                u = torch.normal(mean=logit_mean, std=logit_std, size=(batch_size,), device="cpu")
-                u = torch.nn.functional.sigmoid(u)
-            elif weighting_scheme == "mode":
-                u = torch.rand(size=(batch_size,), device="cpu")
-                u = 1 - u - mode_scale * (torch.cos(math.pi * u / 2) ** 2 - 1 + u)
-            else:
-                u = torch.rand(size=(batch_size,), device="cpu")
-            return u
-
-        def compute_loss_weighting_for_sd3(weighting_scheme: str, sigmas=None):
-            """Computes loss weighting scheme for SD3 training.
-
-            Courtesy: This was contributed by Rafie Walker in https://github.com/huggingface/diffusers/pull/8528.
-
-            SD3 paper reference: https://arxiv.org/abs/2403.03206v1.
-            """
-            if weighting_scheme == "sigma_sqrt":
-                weighting = (sigmas**-2.0).float()
-            elif weighting_scheme == "cosmap":
-                bot = 1 - 2 * sigmas + 2 * sigmas**2
-                weighting = 2 / (math.pi * bot)
-            else:
-                weighting = torch.ones_like(sigmas)
-            return weighting
-
         # Sample noise that we'll add to the latents
         noise = torch.randn_like(latents)
         bsz = latents.shape[0]
 
-        if args.timestep_sampling == "uniform" or args.timestep_sampling == "sigmoid":
-            # Simple random t-based noise sampling
-            if args.timestep_sampling == "sigmoid":
-                # https://github.com/XLabs-AI/x-flux/tree/main
-                t = torch.sigmoid(args.sigmoid_scale * torch.randn((bsz,), device=accelerator.device))
-            else:
-                t = torch.rand((bsz,), device=accelerator.device)
-            timesteps = t * 1000.0
-            t = t.view(-1, 1, 1, 1)
-            noisy_model_input = (1 - t) * latents + t * noise
-        else:
-            # Sample a random timestep for each image
-            # for weighting schemes where we sample timesteps non-uniformly
-            u = compute_density_for_timestep_sampling(
-                weighting_scheme=args.weighting_scheme,
-                batch_size=bsz,
-                logit_mean=args.logit_mean,
-                logit_std=args.logit_std,
-                mode_scale=args.mode_scale,
+        # get noisy model input and timesteps
+        noisy_model_input, timesteps, sigmas = flux_train_utils.get_noisy_model_input_and_timesteps(
+            args, noise_scheduler, latents, noise, accelerator.device, weight_dtype
         )
-            indices = (u * self.noise_scheduler_copy.config.num_train_timesteps).long()
-            timesteps = self.noise_scheduler_copy.timesteps[indices].to(device=accelerator.device)
-
-            # Add noise according to flow matching.
-            sigmas = get_sigmas(timesteps, n_dim=latents.ndim, dtype=weight_dtype)
-            noisy_model_input = sigmas * noise + (1.0 - sigmas) * latents
 
         # pack latents and get img_ids
         packed_noisy_model_input = flux_utils.pack_latents(noisy_model_input)  # b, c, h*2, w*2 -> b, h*w, c*4
@@ -425,20 +354,8 @@ class FluxNetworkTrainer(train_network.NetworkTrainer):
         # unpack latents
         model_pred = flux_utils.unpack_latents(model_pred, packed_latent_height, packed_latent_width)
 
-        if args.model_prediction_type == "raw":
-            # use model_pred as is
-            weighting = None
-        elif args.model_prediction_type == "additive":
-            # add the model_pred to the noisy_model_input
-            model_pred = model_pred + noisy_model_input
-            weighting = None
-        elif args.model_prediction_type == "sigma_scaled":
-            # apply sigma scaling
-            model_pred = model_pred * (-sigmas) + noisy_model_input
-
-            # these weighting schemes use a uniform timestep sampling
-            # and instead post-weight the loss
-            weighting = compute_loss_weighting_for_sd3(weighting_scheme=args.weighting_scheme, sigmas=sigmas)
+        # apply model prediction type
+        model_pred, weighting = flux_train_utils.apply_model_prediction_type(args, model_pred, noisy_model_input, sigmas)
 
         # flow matching loss: this is different from SD3
         target = noise - latents
@@ -469,83 +386,14 @@ class FluxNetworkTrainer(train_network.NetworkTrainer):
 
 def setup_parser() -> argparse.ArgumentParser:
     parser = train_network.setup_parser()
-    # sdxl_train_util.add_sdxl_training_arguments(parser)
-    parser.add_argument("--clip_l", type=str, help="path to clip_l")
-    parser.add_argument("--t5xxl", type=str, help="path to t5xxl")
-    parser.add_argument("--ae", type=str, help="path to ae")
-    parser.add_argument("--apply_t5_attn_mask", action="store_true")
-    parser.add_argument(
-        "--cache_text_encoder_outputs", action="store_true", help="cache text encoder outputs / text encoderの出力をキャッシュする"
-    )
-    parser.add_argument(
-        "--cache_text_encoder_outputs_to_disk",
-        action="store_true",
-        help="cache text encoder outputs to disk / text encoderの出力をディスクにキャッシュする",
-    )
+    flux_train_utils.add_flux_train_arguments(parser)
+
     parser.add_argument(
         "--split_mode",
         action="store_true",
         help="[EXPERIMENTAL] use split mode for Flux model, network arg `train_blocks=single` is required"
         + "/[実験的] Fluxモデルの分割モードを使用する。ネットワーク引数`train_blocks=single`が必要",
     )
-    parser.add_argument(
-        "--t5xxl_max_token_length",
-        type=int,
-        default=None,
-        help="maximum token length for T5-XXL. if omitted, 256 for schnell and 512 for dev"
-        " / T5-XXLの最大トークン長。省略された場合、schnellの場合は256、devの場合は512",
-    )
-    # copy from Diffusers
-    parser.add_argument(
-        "--weighting_scheme",
-        type=str,
-        default="none",
-        choices=["sigma_sqrt", "logit_normal", "mode", "cosmap", "none"],
-    )
-    parser.add_argument(
-        "--logit_mean", type=float, default=0.0, help="mean to use when using the `'logit_normal'` weighting scheme."
-    )
-    parser.add_argument("--logit_std", type=float, default=1.0, help="std to use when using the `'logit_normal'` weighting scheme.")
-    parser.add_argument(
-        "--mode_scale",
-        type=float,
-        default=1.29,
-        help="Scale of mode weighting scheme. Only effective when using the `'mode'` as the `weighting_scheme`.",
-    )
-    parser.add_argument(
-        "--guidance_scale",
-        type=float,
-        default=3.5,
-        help="the FLUX.1 dev variant is a guidance distilled model",
-    )
-
-    parser.add_argument(
-        "--timestep_sampling",
-        choices=["sigma", "uniform", "sigmoid"],
-        default="sigma",
-        help="Method to sample timesteps: sigma-based, uniform random, or sigmoid of random normal. / タイムステップをサンプリングする方法：sigma、random uniform、またはrandom normalのsigmoid。",
-    )
-    parser.add_argument(
-        "--sigmoid_scale",
-        type=float,
-        default=1.0,
-        help='Scale factor for sigmoid timestep sampling (only used when timestep-sampling is "sigmoid"). / sigmoidタイムステップサンプリングの倍率（timestep-samplingが"sigmoid"の場合のみ有効）。',
-    )
-    parser.add_argument(
-        "--model_prediction_type",
-        choices=["raw", "additive", "sigma_scaled"],
-        default="sigma_scaled",
-        help="How to interpret and process the model prediction: "
-        "raw (use as is), additive (add to noisy input), sigma_scaled (apply sigma scaling)."
-        " / モデル予測の解釈と処理方法："
-        "raw（そのまま使用）、additive（ノイズ入力に加算）、sigma_scaled（シグマスケーリングを適用）。",
-    )
-    parser.add_argument(
-        "--discrete_flow_shift",
-        type=float,
-        default=3.0,
-        help="Discrete flow shift for the Euler Discrete Scheduler, default is 3.0. / Euler Discrete Schedulerの離散フローシフト、デフォルトは3.0。",
-    )
     return parser
 
 

library/flux_train_utils.py

@@ -12,8 +12,9 @@ from accelerate import Accelerator, PartialState
 from transformers import CLIPTextModel
 from tqdm import tqdm
 from PIL import Image
+from safetensors.torch import save_file
 
-from library import flux_models, flux_utils, strategy_base
+from library import flux_models, flux_utils, strategy_base, train_util
 from library.sd3_train_utils import load_prompts
 from library.device_utils import init_ipex, clean_memory_on_device
 
@@ -27,6 +28,9 @@ import logging
 logger = logging.getLogger(__name__)
 
 
+# region sample images
+
+
 def sample_images(
     accelerator: Accelerator,
     args: argparse.Namespace,
@@ -295,3 +299,267 @@ def denoise(
         img = img + (t_prev - t_curr) * pred
 
     return img
+
+
+# endregion
+
+
+# region train
+def get_sigmas(noise_scheduler, timesteps, device, n_dim=4, dtype=torch.float32):
+    sigmas = noise_scheduler.sigmas.to(device=device, dtype=dtype)
+    schedule_timesteps = noise_scheduler.timesteps.to(device)
+    timesteps = timesteps.to(device)
+    step_indices = [(schedule_timesteps == t).nonzero().item() for t in timesteps]
+
+    sigma = sigmas[step_indices].flatten()
+    while len(sigma.shape) < n_dim:
+        sigma = sigma.unsqueeze(-1)
+    return sigma
+
+
+def compute_density_for_timestep_sampling(
+    weighting_scheme: str, batch_size: int, logit_mean: float = None, logit_std: float = None, mode_scale: float = None
+):
+    """Compute the density for sampling the timesteps when doing SD3 training.
+
+    Courtesy: This was contributed by Rafie Walker in https://github.com/huggingface/diffusers/pull/8528.
+
+    SD3 paper reference: https://arxiv.org/abs/2403.03206v1.
+    """
+    if weighting_scheme == "logit_normal":
+        # See 3.1 in the SD3 paper ($rf/lognorm(0.00,1.00)$).
+        u = torch.normal(mean=logit_mean, std=logit_std, size=(batch_size,), device="cpu")
+        u = torch.nn.functional.sigmoid(u)
+    elif weighting_scheme == "mode":
+        u = torch.rand(size=(batch_size,), device="cpu")
+        u = 1 - u - mode_scale * (torch.cos(math.pi * u / 2) ** 2 - 1 + u)
+    else:
+        u = torch.rand(size=(batch_size,), device="cpu")
+    return u
+
+
+def compute_loss_weighting_for_sd3(weighting_scheme: str, sigmas=None):
+    """Computes loss weighting scheme for SD3 training.
+
+    Courtesy: This was contributed by Rafie Walker in https://github.com/huggingface/diffusers/pull/8528.
+
+    SD3 paper reference: https://arxiv.org/abs/2403.03206v1.
+    """
+    if weighting_scheme == "sigma_sqrt":
+        weighting = (sigmas**-2.0).float()
+    elif weighting_scheme == "cosmap":
+        bot = 1 - 2 * sigmas + 2 * sigmas**2
+        weighting = 2 / (math.pi * bot)
+    else:
+        weighting = torch.ones_like(sigmas)
+    return weighting
+
+
+def get_noisy_model_input_and_timesteps(
+    args, noise_scheduler, latents, noise, device, dtype
+) -> Tuple[torch.Tensor, torch.Tensor, torch.Tensor]:
+    bsz = latents.shape[0]
+    sigmas = None
+
+    if args.timestep_sampling == "uniform" or args.timestep_sampling == "sigmoid":
+        # Simple random t-based noise sampling
+        if args.timestep_sampling == "sigmoid":
+            # https://github.com/XLabs-AI/x-flux/tree/main
+            t = torch.sigmoid(args.sigmoid_scale * torch.randn((bsz,), device=device))
+        else:
+            t = torch.rand((bsz,), device=device)
+        timesteps = t * 1000.0
+        t = t.view(-1, 1, 1, 1)
+        noisy_model_input = (1 - t) * latents + t * noise
+    else:
+        # Sample a random timestep for each image
+        # for weighting schemes where we sample timesteps non-uniformly
+        u = compute_density_for_timestep_sampling(
+            weighting_scheme=args.weighting_scheme,
+            batch_size=bsz,
+            logit_mean=args.logit_mean,
+            logit_std=args.logit_std,
+            mode_scale=args.mode_scale,
+        )
+        indices = (u * noise_scheduler.config.num_train_timesteps).long()
+        timesteps = noise_scheduler.timesteps[indices].to(device=device)
+
+        # Add noise according to flow matching.
+        sigmas = get_sigmas(noise_scheduler, timesteps, device, n_dim=latents.ndim, dtype=dtype)
+        noisy_model_input = sigmas * noise + (1.0 - sigmas) * latents
+
+    return noisy_model_input, timesteps, sigmas
+
+
+def apply_model_prediction_type(args, model_pred, noisy_model_input, sigmas):
+    weighting = None
+    if args.model_prediction_type == "raw":
+        pass
+    elif args.model_prediction_type == "additive":
+        # add the model_pred to the noisy_model_input
+        model_pred = model_pred + noisy_model_input
+    elif args.model_prediction_type == "sigma_scaled":
+        # apply sigma scaling
+        model_pred = model_pred * (-sigmas) + noisy_model_input
+
+        # these weighting schemes use a uniform timestep sampling
+        # and instead post-weight the loss
+        weighting = compute_loss_weighting_for_sd3(weighting_scheme=args.weighting_scheme, sigmas=sigmas)
+
+    return model_pred, weighting
+
+
+def save_models(ckpt_path: str, flux: flux_models.Flux, sai_metadata: Optional[dict], save_dtype: Optional[torch.dtype] = None):
+    state_dict = {}
+
+    def update_sd(prefix, sd):
+        for k, v in sd.items():
+            key = prefix + k
+            if save_dtype is not None:
+                v = v.detach().clone().to("cpu").to(save_dtype)
+            state_dict[key] = v
+
+    update_sd("", flux.state_dict())
+
+    save_file(state_dict, ckpt_path, metadata=sai_metadata)
+
+
+def save_flux_model_on_train_end(
+    args: argparse.Namespace, save_dtype: torch.dtype, epoch: int, global_step: int, flux: flux_models.Flux
+):
+    def sd_saver(ckpt_file, epoch_no, global_step):
+        sai_metadata = train_util.get_sai_model_spec(None, args, False, False, False, is_stable_diffusion_ckpt=True, flux="dev")
+        save_models(ckpt_file, flux, sai_metadata, save_dtype)
+
+    train_util.save_sd_model_on_train_end_common(args, True, True, epoch, global_step, sd_saver, None)
+
+
+# epochとstepの保存、メタデータにepoch/stepが含まれ引数が同じになるため、統合している
+# on_epoch_end: Trueならepoch終了時、Falseならstep経過時
+def save_flux_model_on_epoch_end_or_stepwise(
+    args: argparse.Namespace,
+    on_epoch_end: bool,
+    accelerator,
+    save_dtype: torch.dtype,
+    epoch: int,
+    num_train_epochs: int,
+    global_step: int,
+    flux: flux_models.Flux,
+):
+    def sd_saver(ckpt_file, epoch_no, global_step):
+        sai_metadata = train_util.get_sai_model_spec(None, args, False, False, False, is_stable_diffusion_ckpt=True, flux="dev")
+        save_models(ckpt_file, flux, sai_metadata, save_dtype)
+
+    train_util.save_sd_model_on_epoch_end_or_stepwise_common(
+        args,
+        on_epoch_end,
+        accelerator,
+        True,
+        True,
+        epoch,
+        num_train_epochs,
+        global_step,
+        sd_saver,
+        None,
+    )
+
+
+# endregion
+
+
+def add_flux_train_arguments(parser: argparse.ArgumentParser):
+    parser.add_argument(
+        "--clip_l",
+        type=str,
+        help="path to clip_l (*.sft or *.safetensors), should be float16 / clip_lのパス（*.sftまたは*.safetensors）、float16が前提",
+    )
+    parser.add_argument(
+        "--t5xxl",
+        type=str,
+        help="path to t5xxl (*.sft or *.safetensors), should be float16 / t5xxlのパス（*.sftまたは*.safetensors）、float16が前提",
+    )
+    parser.add_argument("--ae", type=str, help="path to ae (*.sft or *.safetensors) / aeのパス（*.sftまたは*.safetensors）")
+    parser.add_argument(
+        "--t5xxl_max_token_length",
+        type=int,
+        default=None,
+        help="maximum token length for T5-XXL. if omitted, 256 for schnell and 512 for dev"
+        " / T5-XXLの最大トークン長。省略された場合、schnellの場合は256、devの場合は512",
+    )
+    parser.add_argument(
+        "--apply_t5_attn_mask",
+        action="store_true",
+        help="apply attention mask (zero embs) to T5-XXL / T5-XXLにアテンションマスク（ゼロ埋め）を適用する",
+    )
+    parser.add_argument(
+        "--cache_text_encoder_outputs", action="store_true", help="cache text encoder outputs / text encoderの出力をキャッシュする"
+    )
+    parser.add_argument(
+        "--cache_text_encoder_outputs_to_disk",
+        action="store_true",
+        help="cache text encoder outputs to disk / text encoderの出力をディスクにキャッシュする",
+    )
+    parser.add_argument(
+        "--text_encoder_batch_size",
+        type=int,
+        default=None,
+        help="text encoder batch size (default: None, use dataset's batch size)"
+        + " / text encoderのバッチサイズ（デフォルト: None, データセットのバッチサイズを使用）",
+    )
+    parser.add_argument(
+        "--disable_mmap_load_safetensors",
+        action="store_true",
+        help="disable mmap load for safetensors. Speed up model loading in WSL environment / safetensorsのmmapロードを無効にする。WSL環境等でモデル読み込みを高速化できる",
+    )
+
+    # copy from Diffusers
+    parser.add_argument(
+        "--weighting_scheme",
+        type=str,
+        default="none",
+        choices=["sigma_sqrt", "logit_normal", "mode", "cosmap", "none"],
+    )
+    parser.add_argument(
+        "--logit_mean", type=float, default=0.0, help="mean to use when using the `'logit_normal'` weighting scheme."
+    )
+    parser.add_argument("--logit_std", type=float, default=1.0, help="std to use when using the `'logit_normal'` weighting scheme.")
+    parser.add_argument(
+        "--mode_scale",
+        type=float,
+        default=1.29,
+        help="Scale of mode weighting scheme. Only effective when using the `'mode'` as the `weighting_scheme`.",
+    )
+    parser.add_argument(
+        "--guidance_scale",
+        type=float,
+        default=3.5,
+        help="the FLUX.1 dev variant is a guidance distilled model",
+    )
+
+    parser.add_argument(
+        "--timestep_sampling",
+        choices=["sigma", "uniform", "sigmoid"],
+        default="sigma",
+        help="Method to sample timesteps: sigma-based, uniform random, or sigmoid of random normal. / タイムステップをサンプリングする方法：sigma、random uniform、またはrandom normalのsigmoid。",
+    )
+    parser.add_argument(
+        "--sigmoid_scale",
+        type=float,
+        default=1.0,
+        help='Scale factor for sigmoid timestep sampling (only used when timestep-sampling is "sigmoid"). / sigmoidタイムステップサンプリングの倍率（timestep-samplingが"sigmoid"の場合のみ有効）。',
+    )
+    parser.add_argument(
+        "--model_prediction_type",
+        choices=["raw", "additive", "sigma_scaled"],
+        default="sigma_scaled",
+        help="How to interpret and process the model prediction: "
+        "raw (use as is), additive (add to noisy input), sigma_scaled (apply sigma scaling)."
+        " / モデル予測の解釈と処理方法："
+        "raw（そのまま使用）、additive（ノイズ入力に加算）、sigma_scaled（シグマスケーリングを適用）。",
+    )
+    parser.add_argument(
+        "--discrete_flow_shift",
+        type=float,
+        default=3.0,
+        help="Discrete flow shift for the Euler Discrete Scheduler, default is 3.0. / Euler Discrete Schedulerの離散フローシフト、デフォルトは3.0。",
+    )

library/train_util.py

@@ -2629,7 +2629,7 @@ class MinimalDataset(BaseDataset):
         raise NotImplementedError
 
 
-def load_arbitrary_dataset(args, tokenizer) -> MinimalDataset:
+def load_arbitrary_dataset(args, tokenizer=None) -> MinimalDataset:
     module = ".".join(args.dataset_class.split(".")[:-1])
     dataset_class = args.dataset_class.split(".")[-1]
     module = importlib.import_module(module)