add sdxl fine-tuning and LoRA

library/model_util.py

@@ -1061,6 +1061,16 @@ def load_models_from_stable_diffusion_checkpoint(v2, ckpt_path, device="cpu", dt
 
     return text_model, vae, unet
 
+def get_model_version_str_for_sd1_sd2(v2, v_parameterization):
+    # only for reference
+    version_str = "sd"
+    if v2:
+        version_str += "_v2"
+    else:
+        version_str += "_v1"
+    if v_parameterization:
+        version_str += "_v"
+    return version_str
 
 def convert_text_encoder_state_dict_to_sd_v2(checkpoint, make_dummy_weights=False):
     def convert_key(key):

library/sdxl_model_util.py

@@ -6,6 +6,10 @@ from library import model_util
 from library import sdxl_original_unet
 
 
+VAE_SCALE_FACTOR = 0.13025
+MODEL_VERSION_SDXL_BASE_V0_9 = "sdxl_base_v0-9"
+
+
 def convert_sdxl_text_encoder_2_checkpoint(checkpoint, max_length):
     SDXL_KEY_PREFIX = "conditioner.embedders.1.model."
 
@@ -76,8 +80,8 @@ def convert_sdxl_text_encoder_2_checkpoint(checkpoint, max_length):
     return new_sd, text_projection, logit_scale
 
 
-def load_models_from_sdxl_checkpoint(model_type, ckpt_path, map_location):
-    # model_type is reserved to future use
+def load_models_from_sdxl_checkpoint(model_version, ckpt_path, map_location):
+    # model_version is reserved for future use
 
     # Load the state dict
     if model_util.is_safetensors(ckpt_path):

library/sdxl_original_unet.py

@@ -1069,8 +1069,8 @@ class SdxlUNet2DConditionModel(nn.Module):
         t_emb = t_emb.to(x.dtype)
         emb = self.time_embed(t_emb)
 
-        assert y.shape[0] == x.shape[0]
-        assert x.dtype == y.dtype
+        assert x.shape[0] == y.shape[0], f"batch size mismatch: {x.shape[0]} != {y.shape[0]}"
+        assert x.dtype == y.dtype, f"dtype mismatch: {x.dtype} != {y.dtype}"
         # assert x.dtype == self.dtype
         emb = emb + self.label_emb(y)
 
@@ -1105,6 +1105,8 @@ class SdxlUNet2DConditionModel(nn.Module):
 
 
 if __name__ == "__main__":
+    import time
+
     print("create unet")
     unet = SdxlUNet2DConditionModel()
 
@@ -1132,8 +1134,11 @@ if __name__ == "__main__":
     print("start training")
     steps = 10
     batch_size = 1
+
     for step in range(steps):
         print(f"step {step}")
+        if step == 1:
+            time_start = time.perf_counter()
 
         x = torch.randn(batch_size, 4, 128, 128).cuda()  # 1024x1024
         t = torch.randint(low=0, high=10, size=(batch_size,), device="cuda")
@@ -1149,3 +1154,6 @@ if __name__ == "__main__":
         scaler.step(optimizer)
         scaler.update()
         optimizer.zero_grad(set_to_none=True)
+
+    time_end = time.perf_counter()
+    print(f"elapsed time: {time_end - time_start} [sec] for last {steps - 1} steps")

library/sdxl_train_util.py

@@ -0,0 +1,384 @@
+import argparse
+import gc
+import math
+import os
+from types import SimpleNamespace
+from typing import Any
+import torch
+from tqdm import tqdm
+from transformers import CLIPTokenizer
+import open_clip
+from library import model_util, sdxl_model_util, train_util
+
+TOKENIZER_PATH = "openai/clip-vit-large-patch14"
+
+DEFAULT_NOISE_OFFSET = 0.0357
+
+
+# TODO: separate checkpoint for each U-Net/Text Encoder/VAE
+def load_target_model(args, accelerator, model_version: str, weight_dtype):
+    # load models for each process
+    for pi in range(accelerator.state.num_processes):
+        if pi == accelerator.state.local_process_index:
+            print(f"loading model for process {accelerator.state.local_process_index}/{accelerator.state.num_processes}")
+
+            (
+                load_stable_diffusion_format,
+                text_encoder1,
+                text_encoder2,
+                vae,
+                unet,
+                text_projection,
+                logit_scale,
+                ckpt_info,
+            ) = _load_target_model(args, model_version, weight_dtype, accelerator.device if args.lowram else "cpu")
+
+            # work on low-ram device
+            if args.lowram:
+                text_encoder1.to(accelerator.device)
+                text_encoder2.to(accelerator.device)
+                unet.to(accelerator.device)
+                vae.to(accelerator.device)
+
+            gc.collect()
+            torch.cuda.empty_cache()
+        accelerator.wait_for_everyone()
+
+    text_encoder1, text_encoder2, unet = train_util.transform_models_if_DDP([text_encoder1, text_encoder2, unet])
+
+    return load_stable_diffusion_format, text_encoder1, text_encoder2, vae, unet, text_projection, logit_scale, ckpt_info
+
+
+def _load_target_model(args: argparse.Namespace, model_version: str, weight_dtype, device="cpu"):
+    # only supports StableDiffusion
+    name_or_path = args.pretrained_model_name_or_path
+    name_or_path = os.readlink(name_or_path) if os.path.islink(name_or_path) else name_or_path
+    load_stable_diffusion_format = os.path.isfile(name_or_path)  # determine SD or Diffusers
+    assert (
+        load_stable_diffusion_format
+    ), f"only supports StableDiffusion format for SDXL / SDXLではStableDiffusion形式のみサポートしています: {name_or_path}"
+
+    print(f"load StableDiffusion checkpoint: {name_or_path}")
+    (
+        text_encoder1,
+        text_encoder2,
+        vae,
+        unet,
+        text_projection,
+        logit_scale,
+        ckpt_info,
+    ) = sdxl_model_util.load_models_from_sdxl_checkpoint(model_version, name_or_path, device)
+
+    # VAEを読み込む
+    if args.vae is not None:
+        vae = model_util.load_vae(args.vae, weight_dtype)
+        print("additional VAE loaded")
+
+    return load_stable_diffusion_format, text_encoder1, text_encoder2, vae, unet, text_projection, logit_scale, ckpt_info
+
+
+class WrapperTokenizer:
+    # open clipのtokenizerをHuggingFaceのtokenizerと同じ形で使えるようにする
+    def __init__(self):
+        open_clip_tokenizer = open_clip.tokenizer._tokenizer
+        self.model_max_length = 77
+        self.bos_token_id = open_clip_tokenizer.all_special_ids[0]
+        self.eos_token_id = open_clip_tokenizer.all_special_ids[1]
+        self.pad_token_id = 0  # 結果から推定している
+
+    def __call__(self, *args: Any, **kwds: Any) -> Any:
+        return self.tokenize(*args, **kwds)
+
+    def tokenize(self, text, padding, truncation, max_length, return_tensors):
+        assert padding == "max_length"
+        assert truncation == True
+        assert return_tensors == "pt"
+        input_ids = open_clip.tokenize(text, context_length=max_length)
+        return SimpleNamespace(**{"input_ids": input_ids})
+
+
+def load_tokenizers(args: argparse.Namespace):
+    print("prepare tokenizers")
+    original_path = TOKENIZER_PATH
+
+    tokenizer1: CLIPTokenizer = None
+    if args.tokenizer_cache_dir:
+        local_tokenizer_path = os.path.join(args.tokenizer_cache_dir, original_path.replace("/", "_"))
+        if os.path.exists(local_tokenizer_path):
+            print(f"load tokenizer from cache: {local_tokenizer_path}")
+            tokenizer1 = CLIPTokenizer.from_pretrained(local_tokenizer_path)
+
+    if tokenizer1 is None:
+        tokenizer1 = CLIPTokenizer.from_pretrained(original_path)
+
+    if args.tokenizer_cache_dir and not os.path.exists(local_tokenizer_path):
+        print(f"save Tokenizer to cache: {local_tokenizer_path}")
+        tokenizer1.save_pretrained(local_tokenizer_path)
+
+    if hasattr(args, "max_token_length") and args.max_token_length is not None:
+        print(f"update token length: {args.max_token_length}")
+
+    # tokenizer2 is from open_clip
+    # TODO caching
+    tokenizer2 = WrapperTokenizer()
+
+    return [tokenizer1, tokenizer2]
+
+
+def get_hidden_states(
+    args: argparse.Namespace, input_ids1, input_ids2, tokenizer1, tokenizer2, text_encoder1, text_encoder2, weight_dtype=None
+):
+    input_ids1 = input_ids1.reshape((-1, tokenizer1.model_max_length))  # batch_size*n, 77
+    input_ids2 = input_ids2.reshape((-1, tokenizer2.model_max_length))  # batch_size*n, 77
+
+    # text_encoder1
+    enc_out = text_encoder1(input_ids1, output_hidden_states=True, return_dict=True)
+    hidden_states1 = enc_out["hidden_states"][11]
+
+    # text_encoder2
+    enc_out = text_encoder2(input_ids2, output_hidden_states=True, return_dict=True)
+    hidden_states2 = enc_out["hidden_states"][-2]  # penuultimate layer
+    pool2 = enc_out["pooler_output"]
+
+    if args.max_token_length is not None:
+        # bs*3, 77, 768 or 1024
+        # encoder1: <BOS>...<EOS> の三連を <BOS>...<EOS> へ戻す
+        states_list = [hidden_states1[:, 0].unsqueeze(1)]  # <BOS>
+        for i in range(1, args.max_token_length, tokenizer1.model_max_length):
+            states_list.append(hidden_states1[:, i : i + tokenizer1.model_max_length - 2])  # <BOS> の後から <EOS> の前まで
+        states_list.append(hidden_states1[:, -1].unsqueeze(1))  # <EOS>
+        hidden_states1 = torch.cat(states_list, dim=1)
+
+        # v2: <BOS>...<EOS> <PAD> ... の三連を <BOS>...<EOS> <PAD> ... へ戻す　正直この実装でいいのかわからん
+        states_list = [hidden_states2[:, 0].unsqueeze(1)]  # <BOS>
+        for i in range(1, args.max_token_length, tokenizer2.model_max_length):
+            chunk = hidden_states2[:, i : i + tokenizer2.model_max_length - 2]  # <BOS> の後から 最後の前まで
+            if i > 0:
+                for j in range(len(chunk)):
+                    if input_ids2[j, 1] == tokenizer2.eos_token:  # 空、つまり <BOS> <EOS> <PAD> ...のパターン
+                        chunk[j, 0] = chunk[j, 1]  # 次の <PAD> の値をコピーする
+            states_list.append(chunk)  # <BOS> の後から <EOS> の前まで
+        states_list.append(hidden_states2[:, -1].unsqueeze(1))  # <EOS> か <PAD> のどちらか
+        hidden_states2 = torch.cat(states_list, dim=1)
+
+    if weight_dtype is not None:
+        # this is required for additional network training
+        hidden_states1 = hidden_states1.to(weight_dtype)
+        hidden_states2 = hidden_states2.to(weight_dtype)
+
+    return hidden_states1, hidden_states2, pool2
+
+
+def timestep_embedding(timesteps, dim, max_period=10000):
+    """
+    Create sinusoidal timestep embeddings.
+    :param timesteps: a 1-D Tensor of N indices, one per batch element.
+                      These may be fractional.
+    :param dim: the dimension of the output.
+    :param max_period: controls the minimum frequency of the embeddings.
+    :return: an [N x dim] Tensor of positional embeddings.
+    """
+    half = dim // 2
+    freqs = torch.exp(-math.log(max_period) * torch.arange(start=0, end=half, dtype=torch.float32) / half).to(
+        device=timesteps.device
+    )
+    args = timesteps[:, None].float() * freqs[None]
+    embedding = torch.cat([torch.cos(args), torch.sin(args)], dim=-1)
+    if dim % 2:
+        embedding = torch.cat([embedding, torch.zeros_like(embedding[:, :1])], dim=-1)
+    return embedding
+
+
+def get_timestep_embedding(x, outdim):
+    assert len(x.shape) == 2
+    b, dims = x.shape[0], x.shape[1]
+    x = torch.flatten(x)
+    emb = timestep_embedding(x, outdim)
+    emb = torch.reshape(emb, (b, dims * outdim))
+    return emb
+
+
+def get_size_embeddings(orig_size, crop_size, target_size, device):
+    emb1 = get_timestep_embedding(orig_size, 256)
+    emb2 = get_timestep_embedding(crop_size, 256)
+    emb3 = get_timestep_embedding(target_size, 256)
+    vector = torch.cat([emb1, emb2, emb3], dim=1).to(device)
+    return vector
+
+
+def save_sd_model_on_train_end(
+    args: argparse.Namespace,
+    src_path: str,
+    save_stable_diffusion_format: bool,
+    use_safetensors: bool,
+    save_dtype: torch.dtype,
+    epoch: int,
+    global_step: int,
+    text_encoder1,
+    text_encoder2,
+    unet,
+    vae,
+    text_projection,
+    logit_scale,
+    ckpt_info,
+):
+    def sd_saver(ckpt_file, epoch_no, global_step):
+        sdxl_model_util.save_stable_diffusion_checkpoint(
+            ckpt_file,
+            text_encoder1,
+            text_encoder2,
+            unet,
+            epoch_no,
+            global_step,
+            ckpt_info,
+            vae,
+            text_projection,
+            logit_scale,
+            save_dtype,
+        )
+
+    def diffusers_saver(out_dir):
+        raise NotImplementedError("diffusers_saver is not implemented")
+
+    train_util.save_sd_model_on_train_end_common(
+        args, save_stable_diffusion_format, use_safetensors, epoch, global_step, sd_saver, diffusers_saver
+    )
+
+
+# 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_sd_model_on_epoch_end_or_stepwise(
+    args: argparse.Namespace,
+    on_epoch_end: bool,
+    accelerator,
+    src_path,
+    save_stable_diffusion_format: bool,
+    use_safetensors: bool,
+    save_dtype: torch.dtype,
+    epoch: int,
+    num_train_epochs: int,
+    global_step: int,
+    text_encoder1,
+    text_encoder2,
+    unet,
+    vae,
+    text_projection,
+    logit_scale,
+    ckpt_info,
+):
+    def sd_saver(ckpt_file, epoch_no, global_step):
+        sdxl_model_util.save_stable_diffusion_checkpoint(
+            ckpt_file,
+            text_encoder1,
+            text_encoder2,
+            unet,
+            epoch_no,
+            global_step,
+            ckpt_info,
+            vae,
+            text_projection,
+            logit_scale,
+            save_dtype,
+        )
+
+    def diffusers_saver(out_dir):
+        raise NotImplementedError("diffusers_saver is not implemented")
+
+    train_util.save_sd_model_on_epoch_end_or_stepwise_common(
+        args,
+        on_epoch_end,
+        accelerator,
+        save_stable_diffusion_format,
+        use_safetensors,
+        epoch,
+        num_train_epochs,
+        global_step,
+        sd_saver,
+        diffusers_saver,
+    )
+
+
+# TextEncoderの出力をキャッシュする
+# weight_dtypeを指定するとText Encoderそのもの、およひ出力がweight_dtypeになる
+def cache_text_encoder_outputs(args, accelerator, tokenizers, text_encoders, data_loader, weight_dtype):
+    print("caching text encoder outputs")
+
+    tokenizer1, tokenizer2 = tokenizers
+    text_encoder1, text_encoder2 = text_encoders
+    text_encoder1.to(accelerator.device)
+    text_encoder2.to(accelerator.device)
+    if weight_dtype is not None:
+        text_encoder1.to(dtype=weight_dtype)
+        text_encoder2.to(dtype=weight_dtype)
+
+    text_encoder1_cache = {}
+    text_encoder2_cache = {}
+    for batch in tqdm(data_loader):
+        input_ids1_batch = batch["input_ids"]
+        input_ids2_batch = batch["input_ids2"]
+
+        # split batch to avoid OOM
+        # TODO specify batch size by args
+        for input_ids1, input_ids2 in zip(input_ids1_batch.split(1), input_ids2_batch.split(1)):
+            # remove input_ids already in cache
+            input_ids1 = input_ids1.squeeze(0)
+            input_ids2 = input_ids2.squeeze(0)
+            input_ids1 = [i for i in input_ids1 if i not in text_encoder1_cache]
+            input_ids2 = [i for i in input_ids2 if i not in text_encoder2_cache]
+            assert len(input_ids1) == len(input_ids2)
+            if len(input_ids1) == 0:
+                continue
+            input_ids1 = torch.stack(input_ids1).to(accelerator.device)
+            input_ids2 = torch.stack(input_ids2).to(accelerator.device)
+
+            with torch.no_grad():
+                encoder_hidden_states1, encoder_hidden_states2, pool2 = get_hidden_states(
+                    args,
+                    input_ids1,
+                    input_ids2,
+                    tokenizer1,
+                    tokenizer2,
+                    text_encoder1,
+                    text_encoder2,
+                    None if not args.full_fp16 else weight_dtype,
+                )
+            encoder_hidden_states1 = encoder_hidden_states1.detach().to("cpu")
+            encoder_hidden_states2 = encoder_hidden_states2.detach().to("cpu")
+            pool2 = pool2.to("cpu")
+            for input_id1, input_id2, hidden_states1, hidden_states2, p2 in zip(
+                input_ids1, input_ids2, encoder_hidden_states1, encoder_hidden_states2, pool2
+            ):
+                text_encoder1_cache[tuple(input_id1.tolist())] = hidden_states1
+                text_encoder2_cache[tuple(input_id2.tolist())] = (hidden_states2, p2)
+    return text_encoder1_cache, text_encoder2_cache
+
+
+def add_sdxl_training_arguments(parser: argparse.ArgumentParser):
+    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"
+    )
+
+
+def verify_sdxl_training_args(args: argparse.Namespace):
+    assert (
+        not args.v2 and not args.v_parameterization
+    ), "v2 or v_parameterization cannot be enabled in SDXL training / SDXL学習ではv2とv_parameterizationを有効にすることはできません"
+    if args.clip_skip is not None:
+        print("clip_skip will be unexpected / SDXL学習ではclip_skipは動作しません")
+
+    if args.multires_noise_iterations:
+        print(
+            f"Warning: SDXL has been trained with noise_offset={DEFAULT_NOISE_OFFSET}, but noise_offset is disabled due to multires_noise_iterations / SDXLはnoise_offset={DEFAULT_NOISE_OFFSET}で学習されていますが、multires_noise_iterationsが有効になっているためnoise_offsetは無効になります"
+        )
+    else:
+        if args.noise_offset is None:
+            args.noise_offset = DEFAULT_NOISE_OFFSET
+        elif args.noise_offset != DEFAULT_NOISE_OFFSET:
+            print(
+                f"Waring: SDXL has been trained with noise_offset={DEFAULT_NOISE_OFFSET} / SDXLはnoise_offset={DEFAULT_NOISE_OFFSET}で学習されています"
+            )
+        print(f"noise_offset is set to {args.noise_offset} / noise_offsetが{args.noise_offset}に設定されました")
+
+    assert (
+        not args.weighted_captions
+    ), "weighted_captions cannot be enabled in SDXL training currently / SDXL学習では今のところweighted_captionsを有効にすることはできません"

library/train_util.py

@@ -798,6 +798,19 @@ class BaseDataset(torch.utils.data.Dataset):
     def is_latent_cacheable(self):
         return all([not subset.color_aug and not subset.random_crop for subset in self.subsets])
 
+    def is_text_encoder_output_cacheable(self):
+        return all(
+            [
+                not (
+                    subset.caption_dropout_rate > 0
+                    or subset.shuffle_caption
+                    or subset.token_warmup_step > 0
+                    or subset.caption_tag_dropout_rate > 0
+                )
+                for subset in self.subsets
+            ]
+        )
+
     def is_disk_cached_latents_is_expected(self, reso, npz_path, flipped_npz_path):
         expected_latents_size = (reso[1] // 8, reso[0] // 8)  # bucket_resoはWxHなので注意
 
@@ -850,7 +863,7 @@ class BaseDataset(torch.utils.data.Dataset):
                     continue
 
                 cache_available = self.is_disk_cached_latents_is_expected(
-                    info.bucket_reso, info.latents_npz, info.latents_npz_flipped if self.flip_aug else None
+                    info.bucket_reso, info.latents_npz, info.latents_npz_flipped if subset.flip_aug else None
                 )
 
                 if cache_available:  # do not add to batch
@@ -1719,6 +1732,9 @@ class DatasetGroup(torch.utils.data.ConcatDataset):
     def is_latent_cacheable(self) -> bool:
         return all([dataset.is_latent_cacheable() for dataset in self.datasets])
 
+    def is_text_encoder_output_cacheable(self) -> bool:
+        return all([dataset.is_text_encoder_output_cacheable() for dataset in self.datasets])
+
     def set_current_epoch(self, epoch):
         for dataset in self.datasets:
             dataset.set_current_epoch(epoch)
@@ -3284,11 +3300,17 @@ def _load_target_model(args: argparse.Namespace, weight_dtype, device="cpu", une
     return text_encoder, vae, unet, load_stable_diffusion_format
 
 
+# TODO remove this function in the future
 def transform_if_model_is_DDP(text_encoder, unet, network=None):
     # Transform text_encoder, unet and network from DistributedDataParallel
     return (model.module if type(model) == DDP else model for model in [text_encoder, unet, network] if model is not None)
 
 
+def transform_models_if_DDP(models):
+    # Transform text_encoder, unet and network from DistributedDataParallel
+    return [model.module if type(model) == DDP else model for model in models if model is not None]
+
+
 def load_target_model(args, weight_dtype, accelerator, unet_use_linear_projection_in_v2=False):
     # load models for each process
     for pi in range(accelerator.state.num_processes):
@@ -3430,6 +3452,42 @@ def save_sd_model_on_epoch_end_or_stepwise(
     text_encoder,
     unet,
     vae,
+):
+    def sd_saver(ckpt_file, epoch_no, global_step):
+        model_util.save_stable_diffusion_checkpoint(
+            args.v2, ckpt_file, text_encoder, unet, src_path, epoch_no, global_step, save_dtype, vae
+        )
+
+    def diffusers_saver(out_dir):
+        model_util.save_diffusers_checkpoint(
+            args.v2, out_dir, text_encoder, unet, src_path, vae=vae, use_safetensors=use_safetensors
+        )
+
+    save_sd_model_on_epoch_end_or_stepwise_common(
+        args,
+        on_epoch_end,
+        accelerator,
+        save_stable_diffusion_format,
+        use_safetensors,
+        epoch,
+        num_train_epochs,
+        global_step,
+        sd_saver,
+        diffusers_saver,
+    )
+
+
+def save_sd_model_on_epoch_end_or_stepwise_common(
+    args: argparse.Namespace,
+    on_epoch_end: bool,
+    accelerator,
+    save_stable_diffusion_format: bool,
+    use_safetensors: bool,
+    epoch: int,
+    num_train_epochs: int,
+    global_step: int,
+    sd_saver,
+    diffusers_saver,
 ):
     if on_epoch_end:
         epoch_no = epoch + 1
@@ -3457,9 +3515,7 @@ def save_sd_model_on_epoch_end_or_stepwise(
 
         ckpt_file = os.path.join(args.output_dir, ckpt_name)
         print(f"\nsaving checkpoint: {ckpt_file}")
-        model_util.save_stable_diffusion_checkpoint(
-            args.v2, ckpt_file, text_encoder, unet, src_path, epoch_no, global_step, save_dtype, vae
-        )
+        sd_saver(ckpt_file, epoch_no, global_step)
 
         if args.huggingface_repo_id is not None:
             huggingface_util.upload(args, ckpt_file, "/" + ckpt_name)
@@ -3483,9 +3539,8 @@ def save_sd_model_on_epoch_end_or_stepwise(
             out_dir = os.path.join(args.output_dir, STEP_DIFFUSERS_DIR_NAME.format(model_name, global_step))
 
         print(f"\nsaving model: {out_dir}")
-        model_util.save_diffusers_checkpoint(
-            args.v2, out_dir, text_encoder, unet, src_path, vae=vae, use_safetensors=use_safetensors
-        )
+        diffusers_saver(out_dir)
+
         if args.huggingface_repo_id is not None:
             huggingface_util.upload(args, out_dir, "/" + model_name)
 
@@ -3578,6 +3633,30 @@ def save_sd_model_on_train_end(
     text_encoder,
     unet,
     vae,
+):
+    def sd_saver(ckpt_file, epoch_no, global_step):
+        model_util.save_stable_diffusion_checkpoint(
+            args.v2, ckpt_file, text_encoder, unet, src_path, epoch_no, global_step, save_dtype, vae
+        )
+
+    def diffusers_saver(out_dir):
+        model_util.save_diffusers_checkpoint(
+            args.v2, out_dir, text_encoder, unet, src_path, vae=vae, use_safetensors=use_safetensors
+        )
+
+    save_sd_model_on_train_end_common(
+        args, save_stable_diffusion_format, use_safetensors, epoch, global_step, sd_saver, diffusers_saver
+    )
+
+
+def save_sd_model_on_train_end_common(
+    args: argparse.Namespace,
+    save_stable_diffusion_format: bool,
+    use_safetensors: bool,
+    epoch: int,
+    global_step: int,
+    sd_saver,
+    diffusers_saver,
 ):
     model_name = default_if_none(args.output_name, DEFAULT_LAST_OUTPUT_NAME)
 
@@ -3588,9 +3667,8 @@ def save_sd_model_on_train_end(
         ckpt_file = os.path.join(args.output_dir, ckpt_name)
 
         print(f"save trained model as StableDiffusion checkpoint to {ckpt_file}")
-        model_util.save_stable_diffusion_checkpoint(
-            args.v2, ckpt_file, text_encoder, unet, src_path, epoch, global_step, save_dtype, vae
-        )
+        sd_saver(ckpt_file, epoch, global_step)
+
         if args.huggingface_repo_id is not None:
             huggingface_util.upload(args, ckpt_file, "/" + ckpt_name, force_sync_upload=True)
     else:
@@ -3598,9 +3676,8 @@ def save_sd_model_on_train_end(
         os.makedirs(out_dir, exist_ok=True)
 
         print(f"save trained model as Diffusers to {out_dir}")
-        model_util.save_diffusers_checkpoint(
-            args.v2, out_dir, text_encoder, unet, src_path, vae=vae, use_safetensors=use_safetensors
-        )
+        diffusers_saver(out_dir)
+
         if args.huggingface_repo_id is not None:
             huggingface_util.upload(args, out_dir, "/" + model_name, force_sync_upload=True)
 

networks/lora.py

@@ -5,7 +5,9 @@
 
 import math
 import os
-from typing import List, Tuple, Union
+from typing import Dict, List, Optional, Tuple, Type, Union
+from diffusers import AutoencoderKL
+from transformers import CLIPTextModel
 import numpy as np
 import torch
 import re
@@ -400,7 +402,16 @@ def parse_block_lr_kwargs(nw_kwargs):
     return down_lr_weight, mid_lr_weight, up_lr_weight
 
 
-def create_network(multiplier, network_dim, network_alpha, vae, text_encoder, unet, neuron_dropout=None, **kwargs):
+def create_network(
+    multiplier: float,
+    network_dim: Optional[int],
+    network_alpha: Optional[float],
+    vae: AutoencoderKL,
+    text_encoder: Union[CLIPTextModel, List[CLIPTextModel]],
+    unet,
+    neuron_dropout: Optional[float] = None,
+    **kwargs,
+):
     if network_dim is None:
         network_dim = 4  # default
     if network_alpha is None:
@@ -719,33 +730,36 @@ def create_network_from_weights(multiplier, file, vae, text_encoder, unet, weigh
 class LoRANetwork(torch.nn.Module):
     NUM_OF_BLOCKS = 12  # フルモデル相当でのup,downの層の数
 
-    # is it possible to apply conv_in and conv_out? -> yes, newer LoCon supports it (^^;)
     UNET_TARGET_REPLACE_MODULE = ["Transformer2DModel"]
     UNET_TARGET_REPLACE_MODULE_CONV2D_3X3 = ["ResnetBlock2D", "Downsample2D", "Upsample2D"]
     TEXT_ENCODER_TARGET_REPLACE_MODULE = ["CLIPAttention", "CLIPMLP"]
     LORA_PREFIX_UNET = "lora_unet"
     LORA_PREFIX_TEXT_ENCODER = "lora_te"
     
+    # SDXL: must starts with LORA_PREFIX_TEXT_ENCODER
+    LORA_PREFIX_TEXT_ENCODER1 = "lora_te1"
+    LORA_PREFIX_TEXT_ENCODER2 = "lora_te2"
+
     def __init__(
         self,
-        text_encoder,
+        text_encoder: Union[List[CLIPTextModel], CLIPTextModel],
         unet,
-        multiplier=1.0,
-        lora_dim=4,
-        alpha=1,
-        dropout=None,
-        rank_dropout=None,
-        module_dropout=None,
-        conv_lora_dim=None,
-        conv_alpha=None,
-        block_dims=None,
-        block_alphas=None,
-        conv_block_dims=None,
-        conv_block_alphas=None,
-        modules_dim=None,
-        modules_alpha=None,
-        module_class=LoRAModule,
-        varbose=False,
+        multiplier: float = 1.0,
+        lora_dim: int = 4,
+        alpha: float = 1,
+        dropout: Optional[float] = None,
+        rank_dropout: Optional[float] = None,
+        module_dropout: Optional[float] = None,
+        conv_lora_dim: Optional[int] = None,
+        conv_alpha: Optional[float] = None,
+        block_dims: Optional[List[int]] = None,
+        block_alphas: Optional[List[float]] = None,
+        conv_block_dims: Optional[List[int]] = None,
+        conv_block_alphas: Optional[List[float]] = None,
+        modules_dim: Optional[Dict[str, int]] = None,
+        modules_alpha: Optional[Dict[str, int]] = None,
+        module_class: Type[object] = LoRAModule,
+        varbose: Optional[bool] = False,
     ) -> None:
         """
         LoRA network: すごく引数が多いが、パターンは以下の通り
@@ -783,8 +797,21 @@ class LoRANetwork(torch.nn.Module):
                 print(f"apply LoRA to Conv2d with kernel size (3,3). dim (rank): {self.conv_lora_dim}, alpha: {self.conv_alpha}")
 
         # create module instances
-        def create_modules(is_unet, root_module: torch.nn.Module, target_replace_modules) -> List[LoRAModule]:
-            prefix = LoRANetwork.LORA_PREFIX_UNET if is_unet else LoRANetwork.LORA_PREFIX_TEXT_ENCODER
+        def create_modules(
+            is_unet: bool,
+            text_encoder_idx: Optional[int],  # None, 1, 2
+            root_module: torch.nn.Module,
+            target_replace_modules: List[torch.nn.Module],
+        ) -> List[LoRAModule]:
+            prefix = (
+                self.LORA_PREFIX_UNET
+                if is_unet
+                else (
+                    self.LORA_PREFIX_TEXT_ENCODER
+                    if text_encoder_idx is None
+                    else (self.LORA_PREFIX_TEXT_ENCODER1 if text_encoder_idx == 1 else self.LORA_PREFIX_TEXT_ENCODER2)
+                )
+            )
             loras = []
             skipped = []
             for name, module in root_module.named_modules():
@@ -800,11 +827,14 @@ class LoRANetwork(torch.nn.Module):
 
                             dim = None
                             alpha = None
+
                             if modules_dim is not None:
+                                # モジュール指定あり
                                 if lora_name in modules_dim:
                                     dim = modules_dim[lora_name]
                                     alpha = modules_alpha[lora_name]
                             elif is_unet and block_dims is not None:
+                                # U-Netでblock_dims指定あり
                                 block_idx = get_block_index(lora_name)
                                 if is_linear or is_conv2d_1x1:
                                     dim = block_dims[block_idx]
@@ -813,6 +843,7 @@ class LoRANetwork(torch.nn.Module):
                                     dim = conv_block_dims[block_idx]
                                     alpha = conv_block_alphas[block_idx]
                             else:
+                                # 通常、すべて対象とする
                                 if is_linear or is_conv2d_1x1:
                                     dim = self.lora_dim
                                     alpha = self.alpha
@@ -821,6 +852,7 @@ class LoRANetwork(torch.nn.Module):
                                     alpha = self.conv_alpha
 
                             if dim is None or dim == 0:
+                                # skipした情報を出力
                                 if is_linear or is_conv2d_1x1 or (self.conv_lora_dim is not None or conv_block_dims is not None):
                                     skipped.append(lora_name)
                                 continue
@@ -838,7 +870,16 @@ class LoRANetwork(torch.nn.Module):
                             loras.append(lora)
             return loras, skipped
 
-        self.text_encoder_loras, skipped_te = create_modules(False, text_encoder, LoRANetwork.TEXT_ENCODER_TARGET_REPLACE_MODULE)
+        text_encoders = text_encoder if type(text_encoder) == list else [text_encoder]
+
+        # create LoRA for text encoder
+        # 毎回すべてのモジュールを作るのは無駄なので要検討
+        self.text_encoder_loras = []
+        skipped_te = []
+        for i, text_encoder in enumerate(text_encoders):
+            text_encoder_loras, skipped = create_modules(False, i + 1, text_encoder, LoRANetwork.TEXT_ENCODER_TARGET_REPLACE_MODULE)
+            self.text_encoder_loras.extend(text_encoder_loras)
+            skipped_te += skipped
         print(f"create LoRA for Text Encoder: {len(self.text_encoder_loras)} modules.")
 
         # extend U-Net target modules if conv2d 3x3 is enabled, or load from weights
@@ -846,7 +887,7 @@ class LoRANetwork(torch.nn.Module):
         if modules_dim is not None or self.conv_lora_dim is not None or conv_block_dims is not None:
             target_modules += LoRANetwork.UNET_TARGET_REPLACE_MODULE_CONV2D_3X3
 
-        self.unet_loras, skipped_un = create_modules(True, unet, target_modules)
+        self.unet_loras, skipped_un = create_modules(True, None, unet, target_modules)
         print(f"create LoRA for U-Net: {len(self.unet_loras)} modules.")
 
         skipped = skipped_te + skipped_un
@@ -961,6 +1002,7 @@ class LoRANetwork(torch.nn.Module):
 
         return lr_weight
 
+    # 二つのText Encoderに別々の学習率を設定できるようにするといいかも
     def prepare_optimizer_params(self, text_encoder_lr, unet_lr, default_lr):
         self.requires_grad_(True)
         all_params = []

networks/sdxl_merge_lora.py

@@ -0,0 +1,258 @@
+import math
+import argparse
+import os
+import torch
+from safetensors.torch import load_file, save_file
+from tqdm import tqdm
+from library import sdxl_model_util
+import library.model_util as model_util
+import lora
+
+
+def load_state_dict(file_name, dtype):
+    if os.path.splitext(file_name)[1] == ".safetensors":
+        sd = load_file(file_name)
+    else:
+        sd = torch.load(file_name, map_location="cpu")
+    for key in list(sd.keys()):
+        if type(sd[key]) == torch.Tensor:
+            sd[key] = sd[key].to(dtype)
+    return sd
+
+
+def save_to_file(file_name, model, state_dict, dtype):
+    if dtype is not None:
+        for key in list(state_dict.keys()):
+            if type(state_dict[key]) == torch.Tensor:
+                state_dict[key] = state_dict[key].to(dtype)
+
+    if os.path.splitext(file_name)[1] == ".safetensors":
+        save_file(model, file_name)
+    else:
+        torch.save(model, file_name)
+
+
+def merge_to_sd_model(text_encoder1, text_encoder2, unet, models, ratios, merge_dtype):
+    text_encoder1.to(merge_dtype)
+    text_encoder1.to(merge_dtype)
+    unet.to(merge_dtype)
+
+    # create module map
+    name_to_module = {}
+    for i, root_module in enumerate([text_encoder1, text_encoder2, unet]):
+        if i <= 1:
+            if i == 0:
+                prefix = lora.LoRANetwork.LORA_PREFIX_TEXT_ENCODER1
+            else:
+                prefix = lora.LoRANetwork.LORA_PREFIX_TEXT_ENCODER2
+            target_replace_modules = lora.LoRANetwork.TEXT_ENCODER_TARGET_REPLACE_MODULE
+        else:
+            prefix = lora.LoRANetwork.LORA_PREFIX_UNET
+            target_replace_modules = (
+                lora.LoRANetwork.UNET_TARGET_REPLACE_MODULE + lora.LoRANetwork.UNET_TARGET_REPLACE_MODULE_CONV2D_3X3
+            )
+
+        for name, module in root_module.named_modules():
+            if module.__class__.__name__ in target_replace_modules:
+                for child_name, child_module in module.named_modules():
+                    if child_module.__class__.__name__ == "Linear" or child_module.__class__.__name__ == "Conv2d":
+                        lora_name = prefix + "." + name + "." + child_name
+                        lora_name = lora_name.replace(".", "_")
+                        name_to_module[lora_name] = child_module
+
+    for model, ratio in zip(models, ratios):
+        print(f"loading: {model}")
+        lora_sd = load_state_dict(model, merge_dtype)
+
+        print(f"merging...")
+        for key in tqdm(lora_sd.keys()):
+            if "lora_down" in key:
+                up_key = key.replace("lora_down", "lora_up")
+                alpha_key = key[: key.index("lora_down")] + "alpha"
+
+                # find original module for this lora
+                module_name = ".".join(key.split(".")[:-2])  # remove trailing ".lora_down.weight"
+                if module_name not in name_to_module:
+                    print(f"no module found for LoRA weight: {key}")
+                    continue
+                module = name_to_module[module_name]
+                # print(f"apply {key} to {module}")
+
+                down_weight = lora_sd[key]
+                up_weight = lora_sd[up_key]
+
+                dim = down_weight.size()[0]
+                alpha = lora_sd.get(alpha_key, dim)
+                scale = alpha / dim
+
+                # W <- W + U * D
+                weight = module.weight
+                # print(module_name, down_weight.size(), up_weight.size())
+                if len(weight.size()) == 2:
+                    # linear
+                    weight = weight + ratio * (up_weight @ down_weight) * scale
+                elif down_weight.size()[2:4] == (1, 1):
+                    # conv2d 1x1
+                    weight = (
+                        weight
+                        + ratio
+                        * (up_weight.squeeze(3).squeeze(2) @ down_weight.squeeze(3).squeeze(2)).unsqueeze(2).unsqueeze(3)
+                        * scale
+                    )
+                else:
+                    # conv2d 3x3
+                    conved = torch.nn.functional.conv2d(down_weight.permute(1, 0, 2, 3), up_weight).permute(1, 0, 2, 3)
+                    # print(conved.size(), weight.size(), module.stride, module.padding)
+                    weight = weight + ratio * conved * scale
+
+                module.weight = torch.nn.Parameter(weight)
+
+
+def merge_lora_models(models, ratios, merge_dtype):
+    base_alphas = {}  # alpha for merged model
+    base_dims = {}
+
+    merged_sd = {}
+    for model, ratio in zip(models, ratios):
+        print(f"loading: {model}")
+        lora_sd = load_state_dict(model, merge_dtype)
+
+        # get alpha and dim
+        alphas = {}  # alpha for current model
+        dims = {}  # dims for current model
+        for key in lora_sd.keys():
+            if "alpha" in key:
+                lora_module_name = key[: key.rfind(".alpha")]
+                alpha = float(lora_sd[key].detach().numpy())
+                alphas[lora_module_name] = alpha
+                if lora_module_name not in base_alphas:
+                    base_alphas[lora_module_name] = alpha
+            elif "lora_down" in key:
+                lora_module_name = key[: key.rfind(".lora_down")]
+                dim = lora_sd[key].size()[0]
+                dims[lora_module_name] = dim
+                if lora_module_name not in base_dims:
+                    base_dims[lora_module_name] = dim
+
+        for lora_module_name in dims.keys():
+            if lora_module_name not in alphas:
+                alpha = dims[lora_module_name]
+                alphas[lora_module_name] = alpha
+                if lora_module_name not in base_alphas:
+                    base_alphas[lora_module_name] = alpha
+
+        print(f"dim: {list(set(dims.values()))}, alpha: {list(set(alphas.values()))}")
+
+        # merge
+        print(f"merging...")
+        for key in tqdm(lora_sd.keys()):
+            if "alpha" in key:
+                continue
+
+            lora_module_name = key[: key.rfind(".lora_")]
+
+            base_alpha = base_alphas[lora_module_name]
+            alpha = alphas[lora_module_name]
+
+            scale = math.sqrt(alpha / base_alpha) * ratio
+
+            if key in merged_sd:
+                assert (
+                    merged_sd[key].size() == lora_sd[key].size()
+                ), f"weights shape mismatch merging v1 and v2, different dims? / 重みのサイズが合いません。v1とv2、または次元数の異なるモデルはマージできません"
+                merged_sd[key] = merged_sd[key] + lora_sd[key] * scale
+            else:
+                merged_sd[key] = lora_sd[key] * scale
+
+    # set alpha to sd
+    for lora_module_name, alpha in base_alphas.items():
+        key = lora_module_name + ".alpha"
+        merged_sd[key] = torch.tensor(alpha)
+
+    print("merged model")
+    print(f"dim: {list(set(base_dims.values()))}, alpha: {list(set(base_alphas.values()))}")
+
+    return merged_sd
+
+
+def merge(args):
+    assert len(args.models) == len(args.ratios), f"number of models must be equal to number of ratios / モデルの数と重みの数は合わせてください"
+
+    def str_to_dtype(p):
+        if p == "float":
+            return torch.float
+        if p == "fp16":
+            return torch.float16
+        if p == "bf16":
+            return torch.bfloat16
+        return None
+
+    merge_dtype = str_to_dtype(args.precision)
+    save_dtype = str_to_dtype(args.save_precision)
+    if save_dtype is None:
+        save_dtype = merge_dtype
+
+    if args.sd_model is not None:
+        print(f"loading SD model: {args.sd_model}")
+
+        (
+            text_model1,
+            text_model2,
+            vae,
+            unet,
+            text_projection,
+            logit_scale,
+            ckpt_info,
+        ) = sdxl_model_util.load_models_from_sdxl_checkpoint(sdxl_model_util.MODEL_VERSION_SDXL_BASE_V0_9, args.sd_model, "cpu")
+
+        merge_to_sd_model(text_model2, text_model2, unet, args.models, args.ratios, merge_dtype)
+
+        print(f"saving SD model to: {args.save_to}")
+        sdxl_model_util.save_stable_diffusion_checkpoint(
+            args.save_to, text_model1, text_model2, unet, 0, 0, ckpt_info, vae, text_projection, logit_scale, save_dtype
+        )
+    else:
+        state_dict = merge_lora_models(args.models, args.ratios, merge_dtype)
+
+        print(f"saving model to: {args.save_to}")
+        save_to_file(args.save_to, state_dict, state_dict, save_dtype)
+
+
+def setup_parser() -> argparse.ArgumentParser:
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "--save_precision",
+        type=str,
+        default=None,
+        choices=[None, "float", "fp16", "bf16"],
+        help="precision in saving, same to merging if omitted / 保存時に精度を変更して保存する、省略時はマージ時の精度と同じ",
+    )
+    parser.add_argument(
+        "--precision",
+        type=str,
+        default="float",
+        choices=["float", "fp16", "bf16"],
+        help="precision in merging (float is recommended) / マージの計算時の精度（floatを推奨）",
+    )
+    parser.add_argument(
+        "--sd_model",
+        type=str,
+        default=None,
+        help="Stable Diffusion model to load: ckpt or safetensors file, merge LoRA models if omitted / 読み込むモデル、ckptまたはsafetensors。省略時はLoRAモデル同士をマージする",
+    )
+    parser.add_argument(
+        "--save_to", type=str, default=None, help="destination file name: ckpt or safetensors file / 保存先のファイル名、ckptまたはsafetensors"
+    )
+    parser.add_argument(
+        "--models", type=str, nargs="*", help="LoRA models to merge: ckpt or safetensors file / マージするLoRAモデル、ckptまたはsafetensors"
+    )
+    parser.add_argument("--ratios", type=float, nargs="*", help="ratios for each model / それぞれのLoRAモデルの比率")
+
+    return parser
+
+
+if __name__ == "__main__":
+    parser = setup_parser()
+
+    args = parser.parse_args()
+    merge(args)

sdxl_minimal_inference.py

@@ -11,10 +11,13 @@ import numpy as np
 import torch
 from tqdm import tqdm
 from transformers import CLIPTokenizer
-from library import sdxl_model_util
 from diffusers import EulerDiscreteScheduler
 from PIL import Image
 import open_clip
+from safetensors.torch import load_file
+
+from library import model_util, sdxl_model_util
+import networks.lora as lora
 
 # scheduler: このあたりの設定はSD1/2と同じでいいらしい
 # scheduler: The settings around here seem to be the same as SD1/2
@@ -85,6 +88,13 @@ if __name__ == "__main__":
     parser.add_argument("--prompt", type=str, default="A photo of a cat")
     parser.add_argument("--negative_prompt", type=str, default="")
     parser.add_argument("--output_dir", type=str, default=".")
+    parser.add_argument(
+        "--lora_weights",
+        type=str,
+        nargs="*",
+        default=[],
+        help="LoRA weights, only supports networks.lora, each arguement is a `path;multiplier` (semi-colon separated)",
+    )
     args = parser.parse_args()
 
     # HuggingFaceのmodel id
@@ -97,7 +107,7 @@ if __name__ == "__main__":
     # 本体RAMが少ない場合はGPUにロードするといいかも
     # If the main RAM is small, it may be better to load it on the GPU
     text_model1, text_model2, vae, unet, text_projection, _, _ = sdxl_model_util.load_models_from_sdxl_checkpoint(
-        "sdxl_base_v0-9", args.ckpt_path, "cpu"
+        sdxl_model_util.MODEL_VERSION_SDXL_BASE_V0_9, args.ckpt_path, "cpu"
     )
 
     # Text Encoder 1はSDXL本体でもHuggingFaceのものを使っている
@@ -134,6 +144,19 @@ if __name__ == "__main__":
 
     unet.set_use_memory_efficient_attention(True, False)
 
+    # LoRA
+    for weights_file in args.lora_weights:
+        if ";" in weights_file:
+            weights_file, multiplier = weights_file.split(";")
+            multiplier = float(multiplier)
+        else:
+            multiplier = 1.0
+
+        lora_model, weights_sd = lora.create_network_from_weights(
+            multiplier, weights_file, vae, [text_model1, text_model2], unet, None, True
+        )
+        lora_model.merge_to([text_model1, text_model2], unet, weights_sd, DTYPE, DEVICE)
+
     # prepare embedding
     with torch.no_grad():
         # vector
@@ -248,7 +271,7 @@ if __name__ == "__main__":
             latents = scheduler.step(noise_pred, t, latents).prev_sample
 
         # latents = 1 / 0.18215 * latents
-        latents = 1 / 0.13025 * latents
+        latents = 1 / sdxl_model_util.VAE_SCALE_FACTOR * latents
         latents = latents.to(torch.float32)
         image = vae.decode(latents).sample
         image = (image / 2 + 0.5).clamp(0, 1)

sdxl_train.py

@@ -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)

sdxl_train_network.py

@@ -0,0 +1,172 @@
+import argparse
+import torch
+from library import sdxl_model_util, sdxl_train_util, train_util
+import train_network
+
+
+class SdxlNetworkTrainer(train_network.NetworkTrainer):
+    def __init__(self):
+        super().__init__()
+        self.vae_scale_factor = sdxl_model_util.VAE_SCALE_FACTOR
+
+    def assert_extra_args(self, args, train_dataset_group):
+        super().assert_extra_args(args)
+        sdxl_train_util.verify_sdxl_training_args(args)
+
+        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"
+
+        assert (
+            args.network_train_unet_only or not args.cache_text_encoder_outputs
+        ), "network for Text Encoder cannot be trained with caching Text Encoder outputs / Text Encoderの出力をキャッシュしながらText Encoderのネットワークを学習することはできません"
+
+    def load_target_model(self, args, weight_dtype, accelerator):
+        (
+            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_model_util.MODEL_VERSION_SDXL_BASE_V0_9, weight_dtype)
+
+        self.load_stable_diffusion_format = load_stable_diffusion_format
+        self.text_projection = text_projection.to(accelerator.device, dtype=weight_dtype)
+        self.logit_scale = logit_scale
+        self.ckpt_info = ckpt_info
+
+        return sdxl_model_util.MODEL_VERSION_SDXL_BASE_V0_9, [text_encoder1, text_encoder2], vae, unet
+
+    def load_tokenizer(self, args):
+        tokenizer = sdxl_train_util.load_tokenizers(args)
+        return tokenizer
+
+    def is_text_encoder_outputs_cached(self, args):
+        return args.cache_text_encoder_outputs
+
+    def cache_text_encoder_outputs_if_needed(
+        self, args, accelerator, unet, vae, tokenizers, text_encoders, data_loader, weight_dtype
+    ):
+        if args.cache_text_encoder_outputs:
+            if not args.lowram:
+                # メモリ消費を減らす
+                print("move vae and unet to cpu to save memory")
+                org_vae_device = vae.device
+                org_unet_device = unet.device
+                vae.to("cpu")
+                unet.to("cpu")
+                if torch.cuda.is_available():
+                    torch.cuda.empty_cache()
+
+            text_encoder1_cache, text_encoder2_cache = sdxl_train_util.cache_text_encoder_outputs(
+                args, accelerator, tokenizers, text_encoders, data_loader, weight_dtype
+            )
+            accelerator.wait_for_everyone()
+            text_encoders[0].to("cpu")
+            text_encoders[1].to("cpu")
+            if torch.cuda.is_available():
+                torch.cuda.empty_cache()
+
+            self.text_encoder1_cache = text_encoder1_cache
+            self.text_encoder2_cache = text_encoder2_cache
+
+            if not args.lowram:
+                print("move vae and unet back to original device")
+                vae.to(org_vae_device)
+                unet.to(org_unet_device)
+        else:
+            self.text_encoder1_cache = None
+            self.text_encoder2_cache = None
+
+            # Text Encoderから毎回出力を取得するので、GPUに乗せておく
+            text_encoders[0].to(accelerator.device)
+            text_encoders[1].to(accelerator.device)
+
+    def get_text_cond(self, args, accelerator, batch, tokenizers, text_encoders, weight_dtype):
+        input_ids1 = batch["input_ids"]
+        input_ids2 = batch["input_ids2"]
+        if not args.cache_text_encoder_outputs:
+            with torch.enable_grad():
+                # 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,
+                    tokenizers[0],
+                    tokenizers[1],
+                    text_encoders[0],
+                    text_encoders[1],
+                    None if not args.full_fp16 else weight_dtype,
+                )
+                pool2 = pool2 @ self.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(self.text_encoder1_cache[tuple(input_id1.tolist())])
+                hidden_states2, p2 = self.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 @ self.text_projection.to(weight_dtype)
+
+        return encoder_hidden_states1, encoder_hidden_states2, pool2
+
+    def call_unet(self, args, accelerator, unet, noisy_latents, timesteps, text_conds, batch, weight_dtype):
+        noisy_latents = noisy_latents.to(weight_dtype)  # TODO check why noisy_latents is not weight_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
+        encoder_hidden_states1, encoder_hidden_states2, pool2 = text_conds
+        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)
+
+        noise_pred = unet(noisy_latents, timesteps, text_embedding, vector_embedding)
+        return noise_pred
+
+    def sample_images(self, accelerator, args, epoch, global_step, device, vae, tokenizer, text_encoder, unet):
+        print("sample_images is not implemented")
+
+
+def setup_parser() -> argparse.ArgumentParser:
+    parser = train_network.setup_parser()
+    sdxl_train_util.add_sdxl_training_arguments(parser)
+    return parser
+
+
+if __name__ == "__main__":
+    parser = setup_parser()
+
+    args = parser.parse_args()
+    args = train_util.read_config_from_file(args, parser)
+
+    trainer = SdxlNetworkTrainer()
+    trainer.train(args)

train_network.py

@@ -3,6 +3,7 @@ import argparse
 import gc
 import math
 import os
+import sys
 import random
 import time
 import json
@@ -12,6 +13,7 @@ from tqdm import tqdm
 import torch
 from accelerate.utils import set_seed
 from diffusers import DDPMScheduler
+from library import model_util
 
 import library.train_util as train_util
 from library.train_util import (
@@ -34,10 +36,14 @@ from library.custom_train_functions import (
 )
 
 
-# TODO 他のスクリプトと共通化する
-def generate_step_logs(
-    args: argparse.Namespace, current_loss, avr_loss, lr_scheduler, keys_scaled=None, mean_norm=None, maximum_norm=None
-):
+class NetworkTrainer:
+    def __init__(self):
+        self.vae_scale_factor = 0.18215
+
+    # TODO 他のスクリプトと共通化する
+    def generate_step_logs(
+        self, args: argparse.Namespace, current_loss, avr_loss, lr_scheduler, keys_scaled=None, mean_norm=None, maximum_norm=None
+    ):
         logs = {"loss/current": current_loss, "loss/average": avr_loss}
 
         if keys_scaled is not None:
@@ -56,8 +62,12 @@ def generate_step_logs(
                 logs["lr/textencoder"] = float(lrs[0])
                 logs["lr/unet"] = float(lrs[-1])  # may be same to textencoder
 
-        if args.optimizer_type.lower().startswith("DAdapt".lower()) or args.optimizer_type.lower() == "Prodigy".lower():  # tracking d*lr value of unet.
-            logs["lr/d*lr"] = lr_scheduler.optimizers[-1].param_groups[0]["d"] * lr_scheduler.optimizers[-1].param_groups[0]["lr"]
+            if (
+                args.optimizer_type.lower().startswith("DAdapt".lower()) or args.optimizer_type.lower() == "Prodigy".lower()
+            ):  # tracking d*lr value of unet.
+                logs["lr/d*lr"] = (
+                    lr_scheduler.optimizers[-1].param_groups[0]["d"] * lr_scheduler.optimizers[-1].param_groups[0]["lr"]
+                )
         else:
             idx = 0
             if not args.network_train_unet_only:
@@ -73,8 +83,39 @@ def generate_step_logs(
 
         return logs
 
+    def assert_extra_args(self, args):
+        pass
 
-def train(args):
+    def load_target_model(self, args, weight_dtype, accelerator):
+        text_encoder, vae, unet, _ = train_util.load_target_model(args, weight_dtype, accelerator)
+        return model_util.get_model_version_str_for_sd1_sd2(args.v2, args.v_parameterization), text_encoder, vae, unet
+
+    def load_tokenizer(self, args):
+        tokenizer = train_util.load_tokenizer(args)
+        return tokenizer
+
+    def is_text_encoder_outputs_cached(self, args):
+        return False
+
+    def cache_text_encoder_outputs_if_needed(
+        self, args, accelerator, uner, vae, tokenizers, text_encoders, data_loader, weight_dtype
+    ):
+        for t_enc in text_encoders:
+            t_enc.to(accelerator.device)
+
+    def get_text_cond(self, args, accelerator, batch, tokenizers, text_encoders, weight_dtype):
+        input_ids = batch["input_ids"].to(accelerator.device)
+        encoder_hidden_states = train_util.get_hidden_states(args, input_ids, tokenizers[0], text_encoders[0], weight_dtype)
+        return encoder_hidden_states
+
+    def call_unet(self, args, accelerator, unet, noisy_latents, timesteps, text_conds, batch, weight_dtype):
+        noise_pred = unet(noisy_latents, timesteps, text_conds).sample
+        return noise_pred
+
+    def sample_images(self, accelerator, args, epoch, global_step, device, vae, tokenizer, text_encoder, unet):
+        train_util.sample_images(accelerator, args, epoch, global_step, device, vae, tokenizer, text_encoder, unet)
+
+    def train(self, args):
         session_id = random.randint(0, 2**32)
         training_started_at = time.time()
         train_util.verify_training_args(args)
@@ -88,7 +129,9 @@ def train(args):
             args.seed = random.randint(0, 2**32)
         set_seed(args.seed)
 
-    tokenizer = train_util.load_tokenizer(args)
+        # tokenizerは単体またはリスト、tokenizersは必ずリスト：既存のコードとの互換性のため
+        tokenizer = self.load_tokenizer(args)
+        tokenizers = tokenizer if isinstance(tokenizer, list) else [tokenizer]
 
         # データセットを準備する
         if args.dataset_class is None:
@@ -155,6 +198,8 @@ def train(args):
                 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"
 
+        self.assert_extra_args(args, train_dataset_group)
+
         # acceleratorを準備する
         print("preparing accelerator")
         accelerator = train_util.prepare_accelerator(args)
@@ -164,14 +209,15 @@ def train(args):
         weight_dtype, save_dtype = train_util.prepare_dtype(args)
 
         # モデルを読み込む
-    text_encoder, vae, unet, _ = train_util.load_target_model(args, weight_dtype, accelerator)
+        model_version, text_encoder, vae, unet = self.load_target_model(args, weight_dtype, accelerator)
+
+        # text_encoder is List[CLIPTextModel] or CLIPTextModel
+        text_encoders = text_encoder if isinstance(text_encoder, list) else [text_encoder]
 
         # モデルに xformers とか memory efficient attention を組み込む
         train_util.replace_unet_modules(unet, args.mem_eff_attn, args.xformers, args.sdpa)
 
         # 差分追加学習のためにモデルを読み込む
-    import sys
-
         sys.path.append(os.path.dirname(__file__))
         accelerator.print("import network module:", args.network_module)
         network_module = importlib.import_module(args.network_module)
@@ -220,7 +266,14 @@ def train(args):
         else:
             # LyCORIS will work with this...
             network = network_module.create_network(
-            1.0, args.network_dim, args.network_alpha, vae, text_encoder, unet, neuron_dropout=args.network_dropout, **net_kwargs
+                1.0,
+                args.network_dim,
+                args.network_alpha,
+                vae,
+                text_encoder,
+                unet,
+                neuron_dropout=args.network_dropout,
+                **net_kwargs,
             )
         if network is None:
             return
@@ -234,7 +287,7 @@ def train(args):
             args.scale_weight_norms = False
 
         train_unet = not args.network_train_text_encoder_only
-    train_text_encoder = not args.network_train_unet_only
+        train_text_encoder = not args.network_train_unet_only and not self.is_text_encoder_outputs_cached(args)
         network.apply_to(text_encoder, unet, train_text_encoder, train_unet)
 
         if args.network_weights is not None:
@@ -243,7 +296,9 @@ def train(args):
 
         if args.gradient_checkpointing:
             unet.enable_gradient_checkpointing()
-        text_encoder.gradient_checkpointing_enable()
+            for t_enc in text_encoders:
+                t_enc.gradient_checkpointing_enable()
+            del t_enc
             network.enable_gradient_checkpointing()  # may have no effect
 
         # 学習に必要なクラスを準備する
@@ -278,7 +333,9 @@ def train(args):
             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}")
+            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)
@@ -295,37 +352,63 @@ def train(args):
             network.to(weight_dtype)
 
         # acceleratorがなんかよろしくやってくれるらしい
+        # TODO めちゃくちゃ冗長なのでコードを整理する
         if train_unet and train_text_encoder:
+            if len(text_encoders) > 1:
+                unet, t_enc1, t_enc2, network, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(
+                    unet, text_encoders[0], text_encoders[1], network, optimizer, train_dataloader, lr_scheduler
+                )
+                text_encoder = text_encoders = [t_enc1, t_enc2]
+                del t_enc1, t_enc2
+            else:
                 unet, text_encoder, network, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(
                     unet, text_encoder, network, optimizer, train_dataloader, lr_scheduler
                 )
+                text_encoders = [text_encoder]
         elif train_unet:
             unet, network, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(
                 unet, network, optimizer, train_dataloader, lr_scheduler
             )
         elif train_text_encoder:
+            if len(text_encoders) > 1:
+                t_enc1, t_enc2, network, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(
+                    text_encoders[0], text_encoders[1], network, optimizer, train_dataloader, lr_scheduler
+                )
+                text_encoder = text_encoders = [t_enc1, t_enc2]
+                del t_enc1, t_enc2
+            else:
                 text_encoder, network, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(
                     text_encoder, network, optimizer, train_dataloader, lr_scheduler
                 )
+                text_encoders = [text_encoder]
         else:
-        network, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(network, optimizer, train_dataloader, lr_scheduler)
+            network, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(
+                network, optimizer, train_dataloader, lr_scheduler
+            )
 
         # transform DDP after prepare (train_network here only)
-    text_encoder, unet, network = train_util.transform_if_model_is_DDP(text_encoder, unet, network)
+        text_encoders = train_util.transform_models_if_DDP(text_encoders)
+        unet, network = train_util.transform_models_if_DDP([unet, network])
 
         unet.requires_grad_(False)
         unet.to(accelerator.device, dtype=weight_dtype)
-    text_encoder.requires_grad_(False)
-    text_encoder.to(accelerator.device)
-    if args.gradient_checkpointing:  # according to TI example in Diffusers, train is required
+        for t_enc in text_encoders:
+            t_enc.requires_grad_(False)
+
+        if args.gradient_checkpointing:
+            # according to TI example in Diffusers, train is required
             unet.train()
-        text_encoder.train()
+            for t_enc in text_encoders:
+                t_enc.train()
 
                 # set top parameter requires_grad = True for gradient checkpointing works
-        text_encoder.text_model.embeddings.requires_grad_(True)
+                t_enc.text_model.embeddings.requires_grad_(True)
         else:
             unet.eval()
-        text_encoder.eval()
+            for t_enc in text_encoders:
+                t_enc.eval()
+
+        del t_enc
 
         network.prepare_grad_etc(text_encoder, unet)
 
@@ -334,6 +417,11 @@ def train(args):
             vae.eval()
             vae.to(accelerator.device, dtype=weight_dtype)
 
+        # 必要ならテキストエンコーダーの出力をキャッシュする: Text Encoderはcpuまたはgpuへ移される
+        self.cache_text_encoder_outputs_if_needed(
+            args, accelerator, unet, vae, tokenizers, text_encoders, train_dataloader, weight_dtype
+        )
+
         # 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)
@@ -356,7 +444,9 @@ def train(args):
         accelerator.print(f"  num reg images / 正則化画像の数: {train_dataset_group.num_reg_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"  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}")
@@ -385,6 +475,7 @@ def train(args):
             "ss_mixed_precision": args.mixed_precision,
             "ss_full_fp16": bool(args.full_fp16),
             "ss_v2": bool(args.v2),
+            "ss_base_model_version": model_version,
             "ss_clip_skip": args.clip_skip,
             "ss_max_token_length": args.max_token_length,
             "ss_cache_latents": bool(args.cache_latents),
@@ -471,7 +562,10 @@ def train(args):
                             i += 1
                         image_dir_or_metadata_file = v
 
-                    dataset_dirs_info[image_dir_or_metadata_file] = {"n_repeats": subset.num_repeats, "img_count": subset.img_count}
+                        dataset_dirs_info[image_dir_or_metadata_file] = {
+                            "n_repeats": subset.num_repeats,
+                            "img_count": subset.img_count,
+                        }
 
                 dataset_metadata["subsets"] = subsets_metadata
                 datasets_metadata.append(dataset_metadata)
@@ -554,7 +648,14 @@ def train(args):
         metadata = {k: str(v) for k, v in metadata.items()}
 
         # make minimum metadata for filtering
-    minimum_keys = ["ss_network_module", "ss_network_dim", "ss_network_alpha", "ss_network_args"]
+        minimum_keys = [
+            "ss_v2",
+            "ss_base_model_version",
+            "ss_network_module",
+            "ss_network_dim",
+            "ss_network_alpha",
+            "ss_network_args",
+        ]
         minimum_metadata = {}
         for key in minimum_keys:
             if key in metadata:
@@ -621,13 +722,13 @@ def train(args):
                         else:
                             # latentに変換
                             latents = vae.encode(batch["images"].to(dtype=weight_dtype)).latent_dist.sample()
-                    latents = latents * 0.18215
+                        latents = latents * self.vae_scale_factor
                     b_size = latents.shape[0]
 
                     with torch.set_grad_enabled(train_text_encoder):
                         # Get the text embedding for conditioning
                         if args.weighted_captions:
-                        encoder_hidden_states = get_weighted_text_embeddings(
+                            text_encoder_conds = get_weighted_text_embeddings(
                                 tokenizer,
                                 text_encoder,
                                 batch["captions"],
@@ -636,15 +737,18 @@ def train(args):
                                 clip_skip=args.clip_skip,
                             )
                         else:
-                        input_ids = batch["input_ids"].to(accelerator.device)
-                        encoder_hidden_states = train_util.get_hidden_states(args, input_ids, tokenizer, text_encoder, weight_dtype)
+                            text_encoder_conds = self.get_text_cond(
+                                args, accelerator, batch, tokenizers, text_encoders, 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)
+                        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)
@@ -655,7 +759,9 @@ def train(args):
 
                     # Predict the noise residual
                     with accelerator.autocast():
-                    noise_pred = unet(noisy_latents, timesteps, encoder_hidden_states).sample
+                        noise_pred = self.call_unet(
+                            args, accelerator, unet, noisy_latents, timesteps, text_encoder_conds, batch, weight_dtype
+                        )
 
                     if args.v_parameterization:
                         # v-parameterization training
@@ -698,9 +804,7 @@ def train(args):
                     progress_bar.update(1)
                     global_step += 1
 
-                train_util.sample_images(
-                    accelerator, args, None, global_step, accelerator.device, vae, tokenizer, text_encoder, unet
-                )
+                    self.sample_images(accelerator, args, None, global_step, accelerator.device, vae, tokenizer, text_encoder, 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:
@@ -732,7 +836,7 @@ def train(args):
                     progress_bar.set_postfix(**{**max_mean_logs, **logs})
 
                 if args.logging_dir is not None:
-                logs = generate_step_logs(args, current_loss, avr_loss, lr_scheduler, keys_scaled, mean_norm, maximum_norm)
+                    logs = self.generate_step_logs(args, current_loss, avr_loss, lr_scheduler, keys_scaled, mean_norm, maximum_norm)
                     accelerator.log(logs, step=global_step)
 
                 if global_step >= args.max_train_steps:
@@ -759,7 +863,9 @@ def train(args):
                     if args.save_state:
                         train_util.save_and_remove_state_on_epoch_end(args, accelerator, epoch + 1)
 
-        train_util.sample_images(accelerator, args, epoch + 1, global_step, accelerator.device, vae, tokenizer, text_encoder, unet)
+            self.sample_images(
+                accelerator, args, epoch + 1, global_step, accelerator.device, vae, tokenizer, text_encoder, unet
+            )
 
             # end of epoch
 
@@ -774,8 +880,6 @@ def train(args):
         if is_main_process and args.save_state:
             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:
             ckpt_name = train_util.get_last_ckpt_name(args, "." + args.save_model_as)
             save_model(ckpt_name, network, global_step, num_train_epochs, force_sync_upload=True)
@@ -866,4 +970,5 @@ if __name__ == "__main__":
     args = parser.parse_args()
     args = train_util.read_config_from_file(args, parser)
 
-    train(args)
+    trainer = NetworkTrainer()
+    trainer.train(args)