make deepspeed_utils

fine_tune.py

@@ -10,7 +10,9 @@ import toml
 from tqdm import tqdm
 
 import torch
+from library import deepspeed_utils
 from library.device_utils import init_ipex, clean_memory_on_device
+
 init_ipex()
 
 from accelerate.utils import set_seed
@@ -42,6 +44,7 @@ from library.custom_train_functions import (
 def train(args):
     train_util.verify_training_args(args)
     train_util.prepare_dataset_args(args, True)
+    deepspeed_utils.prepare_deepspeed_args(args)
     setup_logging(args, reset=True)
 
     cache_latents = args.cache_latents
@@ -219,7 +222,7 @@ def train(args):
         batch_size=1,
         shuffle=True,
         collate_fn=collator,
-        num_workers=n_workers if not args.deepspeed else 1, # To avoid RuntimeError: DataLoader worker exited unexpectedly with exit code 1.
+        num_workers=n_workers,
         persistent_workers=args.persistent_data_loader_workers,
     )
 
@@ -231,7 +234,7 @@ def train(args):
         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)
 
@@ -248,21 +251,16 @@ def train(args):
         text_encoder.to(weight_dtype)
 
     if args.deepspeed:
-        training_models_dict = {}
-        training_models_dict["unet"] = unet
-        if args.train_text_encoder: training_models_dict["text_encoder"] = text_encoder
-
-        ds_model = train_util.prepare_deepspeed_model(args, **training_models_dict)
-        ds_model, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(ds_model, optimizer, train_dataloader, lr_scheduler)
-    
-        training_models = []
-        unet = ds_model.models["unet"]
-        training_models.append(unet)
         if args.train_text_encoder:
-            text_encoder = ds_model.models["text_encoder"]
-            training_models.append(text_encoder)
-            
-    else: # acceleratorがなんかよろしくやってくれるらしい
+            ds_model = deepspeed_utils.prepare_deepspeed_model(args, unet=unet, text_encoder=text_encoder)
+        else:
+            ds_model = deepspeed_utils.prepare_deepspeed_model(args, unet=unet)
+        ds_model, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(
+            ds_model, optimizer, train_dataloader, lr_scheduler
+        )
+        training_models = [ds_model]
+    else:
+        # acceleratorがなんかよろしくやってくれるらしい
         if args.train_text_encoder:
             unet, text_encoder, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(
                 unet, text_encoder, optimizer, train_dataloader, lr_scheduler
@@ -327,13 +325,13 @@ def train(args):
 
         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
+            with accelerator.accumulate(*training_models):
                 with torch.no_grad():
                     if "latents" in batch and batch["latents"] is not None:
                         latents = batch["latents"].to(accelerator.device)  # .to(dtype=weight_dtype)
                     else:
                         # latentに変換
-                        latents = vae.encode(batch["images"].to(dtype=weight_dtype)).latent_dist.sample()
+                        latents = vae.encode(batch["images"].to(dtype=vae_dtype)).latent_dist.sample().to(weight_dtype)
                     latents = latents * 0.18215
                 b_size = latents.shape[0]
 
@@ -493,6 +491,7 @@ def setup_parser() -> argparse.ArgumentParser:
     train_util.add_sd_models_arguments(parser)
     train_util.add_dataset_arguments(parser, False, True, True)
     train_util.add_training_arguments(parser, False)
+    deepspeed_utils.add_deepspeed_arguments(parser)
     train_util.add_sd_saving_arguments(parser)
     train_util.add_optimizer_arguments(parser)
     config_util.add_config_arguments(parser)

library/deepspeed_utils.py

@@ -0,0 +1,139 @@
+import os
+import argparse
+import torch
+from accelerate import DeepSpeedPlugin, Accelerator
+
+from .utils import setup_logging
+
+setup_logging()
+import logging
+
+logger = logging.getLogger(__name__)
+
+
+def add_deepspeed_arguments(parser: argparse.ArgumentParser):
+    # DeepSpeed Arguments. https://huggingface.co/docs/accelerate/usage_guides/deepspeed
+    parser.add_argument("--deepspeed", action="store_true", help="enable deepspeed training")
+    parser.add_argument("--zero_stage", type=int, default=2, choices=[0, 1, 2, 3], help="Possible options are 0,1,2,3.")
+    parser.add_argument(
+        "--offload_optimizer_device",
+        type=str,
+        default=None,
+        choices=[None, "cpu", "nvme"],
+        help="Possible options are none|cpu|nvme. Only applicable with ZeRO Stages 2 and 3.",
+    )
+    parser.add_argument(
+        "--offload_optimizer_nvme_path",
+        type=str,
+        default=None,
+        help="Possible options are /nvme|/local_nvme. Only applicable with ZeRO Stage 3.",
+    )
+    parser.add_argument(
+        "--offload_param_device",
+        type=str,
+        default=None,
+        choices=[None, "cpu", "nvme"],
+        help="Possible options are none|cpu|nvme. Only applicable with ZeRO Stage 3.",
+    )
+    parser.add_argument(
+        "--offload_param_nvme_path",
+        type=str,
+        default=None,
+        help="Possible options are /nvme|/local_nvme. Only applicable with ZeRO Stage 3.",
+    )
+    parser.add_argument(
+        "--zero3_init_flag",
+        action="store_true",
+        help="Flag to indicate whether to enable `deepspeed.zero.Init` for constructing massive models."
+        "Only applicable with ZeRO Stage-3.",
+    )
+    parser.add_argument(
+        "--zero3_save_16bit_model",
+        action="store_true",
+        help="Flag to indicate whether to save 16-bit model. Only applicable with ZeRO Stage-3.",
+    )
+    parser.add_argument(
+        "--fp16_master_weights_and_gradients",
+        action="store_true",
+        help="fp16_master_and_gradients requires optimizer to support keeping fp16 master and gradients while keeping the optimizer states in fp32.",
+    )
+
+
+def prepare_deepspeed_args(args: argparse.Namespace):
+    if not args.deepspeed:
+        return
+
+    # To avoid RuntimeError: DataLoader worker exited unexpectedly with exit code 1.
+    args.max_data_loader_n_workers = 1
+
+
+def prepare_deepspeed_plugin(args: argparse.Namespace):
+    if not args.deepspeed:
+        return None
+
+    try:
+        import deepspeed
+    except ImportError as e:
+        logger.error(
+            "deepspeed is not installed. please install deepspeed in your environment with following command. DS_BUILD_OPS=0 pip install deepspeed"
+        )
+        exit(1)
+
+    deepspeed_plugin = DeepSpeedPlugin(
+        zero_stage=args.zero_stage,
+        gradient_accumulation_steps=args.gradient_accumulation_steps,
+        gradient_clipping=args.max_grad_norm,
+        offload_optimizer_device=args.offload_optimizer_device,
+        offload_optimizer_nvme_path=args.offload_optimizer_nvme_path,
+        offload_param_device=args.offload_param_device,
+        offload_param_nvme_path=args.offload_param_nvme_path,
+        zero3_init_flag=args.zero3_init_flag,
+        zero3_save_16bit_model=args.zero3_save_16bit_model,
+    )
+    deepspeed_plugin.deepspeed_config["train_micro_batch_size_per_gpu"] = args.train_batch_size
+    deepspeed_plugin.deepspeed_config["train_batch_size"] = (
+        args.train_batch_size * args.gradient_accumulation_steps * int(os.environ["WORLD_SIZE"])
+    )
+    deepspeed_plugin.set_mixed_precision(args.mixed_precision)
+    if args.mixed_precision.lower() == "fp16":
+        deepspeed_plugin.deepspeed_config["fp16"]["initial_scale_power"] = 0  # preventing overflow.
+    if args.full_fp16 or args.fp16_master_weights_and_gradients:
+        if args.offload_optimizer_device == "cpu" and args.zero_stage == 2:
+            deepspeed_plugin.deepspeed_config["fp16"]["fp16_master_weights_and_grads"] = True
+            logger.info("[DeepSpeed] full fp16 enable.")
+        else:
+            logger.info(
+                "[DeepSpeed]full fp16, fp16_master_weights_and_grads currently only supported using ZeRO-Offload with DeepSpeedCPUAdam on ZeRO-2 stage."
+            )
+
+    if args.offload_optimizer_device is not None:
+        logger.info("[DeepSpeed] start to manually build cpu_adam.")
+        deepspeed.ops.op_builder.CPUAdamBuilder().load()
+        logger.info("[DeepSpeed] building cpu_adam done.")
+
+    return deepspeed_plugin
+
+
+# Accelerate library does not support multiple models for deepspeed. So, we need to wrap multiple models into a single model.
+def prepare_deepspeed_model(args: argparse.Namespace, **models):
+    # remove None from models
+    models = {k: v for k, v in models.items() if v is not None}
+
+    class DeepSpeedWrapper(torch.nn.Module):
+        def __init__(self, **kw_models) -> None:
+            super().__init__()
+            self.models = torch.nn.ModuleDict()
+
+            for key, model in kw_models.items():
+                if isinstance(model, list):
+                    model = torch.nn.ModuleList(model)
+                assert isinstance(
+                    model, torch.nn.Module
+                ), f"model must be an instance of torch.nn.Module, but got {key} is {type(model)}"
+                self.models.update(torch.nn.ModuleDict({key: model}))
+
+        def get_models(self):
+            return self.models
+
+    ds_model = DeepSpeedWrapper(**models)
+    return ds_model

library/train_util.py

@@ -21,7 +21,6 @@ from typing import (
     Union,
 )
 from accelerate import Accelerator, InitProcessGroupKwargs, DistributedDataParallelKwargs
-from accelerate import DeepSpeedPlugin
 import glob
 import math
 import os
@@ -70,6 +69,7 @@ from library.lpw_stable_diffusion import StableDiffusionLongPromptWeightingPipel
 import library.model_util as model_util
 import library.huggingface_util as huggingface_util
 import library.sai_model_spec as sai_model_spec
+import library.deepspeed_utils as deepspeed_utils
 from library.utils import setup_logging
 
 setup_logging()
@@ -3243,52 +3243,6 @@ def add_training_arguments(parser: argparse.ArgumentParser, support_dreambooth:
             "--prior_loss_weight", type=float, default=1.0, help="loss weight for regularization images / 正則化画像のlossの重み"
         )
 
-    # DeepSpeed Arguments. https://huggingface.co/docs/accelerate/usage_guides/deepspeed
-    parser.add_argument("--deepspeed", action="store_true", help="enable deepspeed training")
-    parser.add_argument(
-        "--zero_stage", 
-        type=int, default=2,
-        choices=[0, 1, 2, 3],
-        help="Possible options are 0,1,2,3."
-    )
-    parser.add_argument(
-        "--offload_optimizer_device", 
-        type=str, default=None,
-        choices=[None, "cpu", "nvme"],
-        help="Possible options are none|cpu|nvme. Only applicable with ZeRO Stages 2 and 3."
-    )
-    parser.add_argument(
-        "--offload_optimizer_nvme_path",
-        type=str, default=None,
-        help="Possible options are /nvme|/local_nvme. Only applicable with ZeRO Stage 3."
-    )
-    parser.add_argument(
-        "--offload_param_device",
-        type=str, default=None,
-        choices=[None, "cpu", "nvme"],
-        help="Possible options are none|cpu|nvme. Only applicable with ZeRO Stage 3."
-    )
-    parser.add_argument(
-        "--offload_param_nvme_path",
-        type=str, default=None,
-        help="Possible options are /nvme|/local_nvme. Only applicable with ZeRO Stage 3."
-    )
-    parser.add_argument(
-        "--zero3_init_flag",
-        action="store_true",
-        help="Flag to indicate whether to enable `deepspeed.zero.Init` for constructing massive models."
-            "Only applicable with ZeRO Stage-3."
-    )
-    parser.add_argument(
-        "--zero3_save_16bit_model",
-        action="store_true",
-        help="Flag to indicate whether to save 16-bit model. Only applicable with ZeRO Stage-3."
-    )
-    parser.add_argument(
-        "--fp16_master_weights_and_gradients",
-        action="store_true",
-        help="fp16_master_and_gradients requires optimizer to support keeping fp16 master and gradients while keeping the optimizer states in fp32."
-    )
 
 def verify_training_args(args: argparse.Namespace):
     r"""
@@ -4090,6 +4044,10 @@ def load_tokenizer(args: argparse.Namespace):
 
 
 def prepare_accelerator(args: argparse.Namespace):
+    """
+    this function also prepares deepspeed plugin
+    """
+
     if args.logging_dir is None:
         logging_dir = None
     else:
@@ -4135,7 +4093,7 @@ def prepare_accelerator(args: argparse.Namespace):
         ),
     )
     kwargs_handlers = list(filter(lambda x: x is not None, kwargs_handlers))
-    deepspeed_plugin = prepare_deepspeed_plugin(args)
+    deepspeed_plugin = deepspeed_utils.prepare_deepspeed_plugin(args)
 
     accelerator = Accelerator(
         gradient_accumulation_steps=args.gradient_accumulation_steps,
@@ -4149,62 +4107,6 @@ def prepare_accelerator(args: argparse.Namespace):
     print("accelerator device:", accelerator.device)
     return accelerator
 
-def prepare_deepspeed_plugin(args: argparse.Namespace):
-    if args.deepspeed is None: return None
-    try:
-        import deepspeed
-    except ImportError as e:
-        print("deepspeed is not installed. please install deepspeed in your environment with following command. DS_BUILD_OPS=0 pip install deepspeed")
-        exit(1)
-
-    deepspeed_plugin = DeepSpeedPlugin(
-        zero_stage=args.zero_stage,
-        gradient_accumulation_steps=args.gradient_accumulation_steps, gradient_clipping=args.max_grad_norm,
-        offload_optimizer_device=args.offload_optimizer_device, offload_optimizer_nvme_path=args.offload_optimizer_nvme_path,
-        offload_param_device=args.offload_param_device, offload_param_nvme_path=args.offload_param_nvme_path,
-        zero3_init_flag=args.zero3_init_flag, zero3_save_16bit_model=args.zero3_save_16bit_model,
-    )
-    deepspeed_plugin.deepspeed_config['train_micro_batch_size_per_gpu'] = args.train_batch_size
-    deepspeed_plugin.deepspeed_config['train_batch_size'] = \
-        args.train_batch_size * args.gradient_accumulation_steps * int(os.environ['WORLD_SIZE'])
-    deepspeed_plugin.set_mixed_precision(args.mixed_precision)
-    if args.mixed_precision.lower() == "fp16":
-        deepspeed_plugin.deepspeed_config['fp16']['initial_scale_power'] = 0 # preventing overflow.
-    if args.full_fp16 or args.fp16_master_weights_and_gradients:
-        if args.offload_optimizer_device == "cpu" and args.zero_stage == 2:
-            deepspeed_plugin.deepspeed_config['fp16']['fp16_master_weights_and_grads'] = True
-            print("[DeepSpeed] full fp16 enable.")
-        else:
-            print("[DeepSpeed]full fp16, fp16_master_weights_and_grads currently only supported using ZeRO-Offload with DeepSpeedCPUAdam on ZeRO-2 stage.")
-    
-    if args.offload_optimizer_device is not None:
-        print('[DeepSpeed] start to manually build cpu_adam.')
-        deepspeed.ops.op_builder.CPUAdamBuilder().load()
-        print('[DeepSpeed] building cpu_adam done.')
-
-    return deepspeed_plugin
-
-def prepare_deepspeed_model(args: argparse.Namespace, **models):
-    class DeepSpeedWrapper(torch.nn.Module):
-        def __init__(self, **kw_models) -> None:
-            super().__init__()
-            self.models = torch.nn.ModuleDict()
-
-            for key, model in kw_models.items():
-                if isinstance(model, list):
-                    model = torch.nn.ModuleList(model)
-                assert isinstance(model, torch.nn.Module), f"model must be an instance of torch.nn.Module, but got {key} is {type(model)}"
-                self.models.update(
-                    torch.nn.ModuleDict(
-                        {key: model}
-                    )
-                )
-
-        def get_models(self):
-            return self.models
-
-    ds_model = DeepSpeedWrapper(**models)
-    return ds_model
 
 def prepare_dtype(args: argparse.Namespace):
     weight_dtype = torch.float32

sdxl_train.py

@@ -11,11 +11,12 @@ from tqdm import tqdm
 
 import torch
 from library.device_utils import init_ipex, clean_memory_on_device
+
 init_ipex()
 
 from accelerate.utils import set_seed
 from diffusers import DDPMScheduler
-from library import sdxl_model_util
+from library import deepspeed_utils, sdxl_model_util
 
 import library.train_util as train_util
 
@@ -97,6 +98,7 @@ def train(args):
     train_util.verify_training_args(args)
     train_util.prepare_dataset_args(args, True)
     sdxl_train_util.verify_sdxl_training_args(args)
+    deepspeed_utils.prepare_deepspeed_args(args)
     setup_logging(args, reset=True)
 
     assert (
@@ -361,7 +363,7 @@ def train(args):
         batch_size=1,
         shuffle=True,
         collate_fn=collator,
-        num_workers=n_workers if not args.deepspeed else 1, # To avoid RuntimeError: DataLoader worker exited unexpectedly with exit code 1.
+        num_workers=n_workers,
         persistent_workers=args.persistent_data_loader_workers,
     )
 
@@ -398,41 +400,31 @@ def train(args):
         text_encoder1.to(weight_dtype)
         text_encoder2.to(weight_dtype)
 
-    if args.deepspeed:
-        training_models_dict = {}
-        if train_unet:
-            training_models_dict["unet"] = unet
-        if train_text_encoder1:
-            text_encoder1.text_model.encoder.layers[-1].requires_grad_(False)
-            text_encoder1.text_model.final_layer_norm.requires_grad_(False)
-            training_models_dict["text_encoder1"] = text_encoder1
-        if train_text_encoder2:
-            training_models_dict["text_encoder2"] = text_encoder2
-        ds_model = train_util.prepare_deepspeed_model(args, **training_models_dict)
-        ds_model, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(ds_model, optimizer, train_dataloader, lr_scheduler)
-        
-        training_models = [] # override training_models
-        if train_unet:
-            unet = ds_model.models["unet"]
-            training_models.append(unet)
-        if train_text_encoder1:
-            text_encoder1 = ds_model.models["text_encoder1"]
-            training_models.append(text_encoder1)
-        if train_text_encoder2:
-            text_encoder2 = ds_model.models["text_encoder2"]
-            training_models.append(text_encoder2)
+    # freeze last layer and final_layer_norm in te1 since we use the output of the penultimate layer
+    if train_text_encoder1:
+        text_encoder1.text_model.encoder.layers[-1].requires_grad_(False)
+        text_encoder1.text_model.final_layer_norm.requires_grad_(False)
 
-    else: # acceleratorがなんかよろしくやってくれるらしい
+    if args.deepspeed:
+        ds_model = deepspeed_utils.prepare_deepspeed_model(
+            args,
+            unet=unet if train_unet else None,
+            text_encoder1=text_encoder1 if train_text_encoder1 else None,
+            text_encoder2=text_encoder2 if train_text_encoder2 else None,
+        )
+        ds_model = accelerator.prepare(ds_model)
+        training_models = [ds_model]
+
+    else:
+        # acceleratorがなんかよろしくやってくれるらしい
         if train_unet:
             unet = accelerator.prepare(unet)
         if train_text_encoder1:
-            # freeze last layer and final_layer_norm in te1 since we use the output of the penultimate layer
-            text_encoder1.text_model.encoder.layers[-1].requires_grad_(False)
-            text_encoder1.text_model.final_layer_norm.requires_grad_(False)
             text_encoder1 = accelerator.prepare(text_encoder1)
         if train_text_encoder2:
             text_encoder2 = accelerator.prepare(text_encoder2)
-        optimizer, train_dataloader, lr_scheduler = accelerator.prepare(optimizer, train_dataloader, lr_scheduler)
+
+    optimizer, train_dataloader, lr_scheduler = accelerator.prepare(optimizer, train_dataloader, lr_scheduler)
 
     # TextEncoderの出力をキャッシュするときにはCPUへ移動する
     if args.cache_text_encoder_outputs:
@@ -446,8 +438,9 @@ def train(args):
         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 and not args.deepspeed:
+    if args.full_fp16:
         # During deepseed training, accelerate not handles fp16/bf16|mixed precision directly via scaler. Let deepspeed engine do.
+        # -> But we think it's ok to patch accelerator even if deepspeed is enabled.
         train_util.patch_accelerator_for_fp16_training(accelerator)
 
     # resumeする
@@ -508,10 +501,10 @@ def train(args):
         for step, batch in enumerate(train_dataloader):
             current_step.value = global_step
             with accelerator.accumulate(*training_models):
-                with torch.no_grad(): # why this block differ within train_network.py?
-                    if "latents" in batch and batch["latents"] is not None:
-                        latents = batch["latents"].to(accelerator.device).to(dtype=weight_dtype)
-                    else:
+                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(vae_dtype)).latent_dist.sample().to(weight_dtype)
 
@@ -519,7 +512,7 @@ def train(args):
                         if torch.any(torch.isnan(latents)):
                             accelerator.print("NaN found in latents, replacing with zeros")
                             latents = torch.nan_to_num(latents, 0, out=latents)
-                    latents = latents * sdxl_model_util.VAE_SCALE_FACTOR
+                latents = latents * sdxl_model_util.VAE_SCALE_FACTOR
 
                 if "text_encoder_outputs1_list" not in batch or batch["text_encoder_outputs1_list"] is None:
                     input_ids1 = batch["input_ids"]
@@ -768,6 +761,7 @@ def setup_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)
+    deepspeed_utils.add_deepspeed_arguments(parser)
     train_util.add_sd_saving_arguments(parser)
     train_util.add_optimizer_arguments(parser)
     config_util.add_config_arguments(parser)

train_db.py

@@ -11,7 +11,9 @@ import toml
 from tqdm import tqdm
 
 import torch
+from library import deepspeed_utils
 from library.device_utils import init_ipex, clean_memory_on_device
+
 init_ipex()
 
 from accelerate.utils import set_seed
@@ -46,6 +48,7 @@ logger = logging.getLogger(__name__)
 def train(args):
     train_util.verify_training_args(args)
     train_util.prepare_dataset_args(args, False)
+    deepspeed_utils.prepare_deepspeed_args(args)
     setup_logging(args, reset=True)
 
     cache_latents = args.cache_latents
@@ -187,7 +190,7 @@ def train(args):
         batch_size=1,
         shuffle=True,
         collate_fn=collator,
-        num_workers=n_workers if not args.deepspeed else 1, # To avoid RuntimeError: DataLoader worker exited unexpectedly with exit code 1.
+        num_workers=n_workers,
         persistent_workers=args.persistent_data_loader_workers,
     )
 
@@ -220,30 +223,27 @@ def train(args):
 
     # acceleratorがなんかよろしくやってくれるらしい
     if args.deepspeed:
-        training_models_dict = {}
-        training_models_dict["unet"] = unet
-        if train_text_encoder: training_models_dict["text_encoder"] = text_encoder
+        if args.train_text_encoder:
+            ds_model = deepspeed_utils.prepare_deepspeed_model(args, unet=unet, text_encoder=text_encoder)
+        else:
+            ds_model = deepspeed_utils.prepare_deepspeed_model(args, unet=unet)
+        ds_model, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(
+            ds_model, optimizer, train_dataloader, lr_scheduler
+        )
+        training_models = [ds_model]
 
-        ds_model = train_util.prepare_deepspeed_model(args, **training_models_dict)
-        ds_model, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(ds_model, optimizer, train_dataloader, lr_scheduler)
-    
-        training_models = []
-        unet = ds_model.models["unet"]
-        training_models.append(unet)
-        if train_text_encoder:
-            text_encoder = ds_model.models["text_encoder"]
-            training_models.append(text_encoder)
-            
     else:
         if train_text_encoder:
             unet, text_encoder, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(
                 unet, text_encoder, optimizer, train_dataloader, lr_scheduler
             )
+            training_models = [unet, text_encoder]
         else:
             unet, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(unet, optimizer, train_dataloader, lr_scheduler)
+            training_models = [unet]
 
-        if not train_text_encoder:
-            text_encoder.to(accelerator.device, dtype=weight_dtype)  # to avoid 'cpu' vs 'cuda' error
+    if not train_text_encoder:
+        text_encoder.to(accelerator.device, dtype=weight_dtype)  # to avoid 'cpu' vs 'cuda' error
 
     # 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:
@@ -312,8 +312,10 @@ def train(args):
                 if not args.gradient_checkpointing:
                     text_encoder.train(False)
                 text_encoder.requires_grad_(False)
+                if len(training_models) == 2:
+                    training_models = training_models[0]  # remove text_encoder from training_models
 
-            with accelerator.accumulate(unet):
+            with accelerator.accumulate(*training_models):
                 with torch.no_grad():
                     # latentに変換
                     if cache_latents:
@@ -480,6 +482,7 @@ def setup_parser() -> argparse.ArgumentParser:
     train_util.add_sd_models_arguments(parser)
     train_util.add_dataset_arguments(parser, True, False, True)
     train_util.add_training_arguments(parser, True)
+    deepspeed_utils.add_deepspeed_arguments(parser)
     train_util.add_sd_saving_arguments(parser)
     train_util.add_optimizer_arguments(parser)
     config_util.add_config_arguments(parser)

train_network.py

@@ -13,13 +13,14 @@ from tqdm import tqdm
 
 import torch
 from library.device_utils import init_ipex, clean_memory_on_device
+
 init_ipex()
 
 from torch.nn.parallel import DistributedDataParallel as DDP
 
 from accelerate.utils import set_seed
 from diffusers import DDPMScheduler
-from library import model_util
+from library import deepspeed_utils, model_util
 
 import library.train_util as train_util
 from library.train_util import (
@@ -141,6 +142,7 @@ class NetworkTrainer:
         training_started_at = time.time()
         train_util.verify_training_args(args)
         train_util.prepare_dataset_args(args, True)
+        deepspeed_utils.prepare_deepspeed_args(args)
         setup_logging(args, reset=True)
 
         cache_latents = args.cache_latents
@@ -357,7 +359,7 @@ class NetworkTrainer:
             batch_size=1,
             shuffle=True,
             collate_fn=collator,
-            num_workers=n_workers if not args.deepspeed else 1, # To avoid RuntimeError: DataLoader worker exited unexpectedly with exit code 1.
+            num_workers=n_workers,
             persistent_workers=args.persistent_data_loader_workers,
         )
 
@@ -414,22 +416,17 @@ class NetworkTrainer:
 
         # acceleratorがなんかよろしくやってくれるらしい / accelerator will do something good
         if args.deepspeed:
-            training_models_dict = {}
-            if train_unet: training_models_dict["unet"] = unet
-            if train_text_encoder: training_models_dict["text_encoder"] = text_encoders
-            training_models_dict["network"] = network
-
-            ds_model = train_util.prepare_deepspeed_model(args, **training_models_dict)
-            ds_model, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(ds_model, optimizer, train_dataloader, lr_scheduler)
-            
-            if train_unet: unet = ds_model.models["unet"]
-            if train_text_encoder:
-                text_encoder = ds_model.models["text_encoder"]
-                if len(ds_model.models["text_encoder"]) > 1:
-                    text_encoders = text_encoder
-                else:
-                    text_encoders = [text_encoder]
-
+            ds_model = deepspeed_utils.prepare_deepspeed_model(
+                args,
+                unet=unet if train_unet else None,
+                text_encoder1=text_encoders[0] if train_text_encoder else None,
+                text_encoder2=text_encoders[1] if train_text_encoder and len(text_encoders) > 1 else None,
+                network=network,
+            )
+            ds_model, optimizer, train_dataloader, lr_scheduler = accelerator.prepare(
+                ds_model, optimizer, train_dataloader, lr_scheduler
+            )
+            training_model = ds_model
         else:
             if train_unet:
                 unet = accelerator.prepare(unet)
@@ -444,7 +441,10 @@ class NetworkTrainer:
             else:
                 pass  # if text_encoder is not trained, no need to prepare. and device and dtype are already set
 
-            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
+            )
+            training_model = network
 
         if args.gradient_checkpointing:
             # according to TI example in Diffusers, train is required
@@ -777,13 +777,13 @@ class NetworkTrainer:
 
             for step, batch in enumerate(train_dataloader):
                 current_step.value = global_step
-                with accelerator.accumulate(network):
+                with accelerator.accumulate(training_model):
                     on_step_start(text_encoder, unet)
 
-                    with torch.no_grad():
-                        if "latents" in batch and batch["latents"] is not None:
-                            latents = batch["latents"].to(accelerator.device)
-                        else:
+                    if "latents" in batch and batch["latents"] is not None:
+                        latents = batch["latents"].to(accelerator.device)
+                    else:
+                        with torch.no_grad():
                             # latentに変換
                             latents = vae.encode(batch["images"].to(dtype=vae_dtype)).latent_dist.sample()
 
@@ -791,7 +791,7 @@ class NetworkTrainer:
                             if torch.any(torch.isnan(latents)):
                                 accelerator.print("NaN found in latents, replacing with zeros")
                                 latents = torch.nan_to_num(latents, 0, out=latents)
-                        latents = latents * self.vae_scale_factor
+                    latents = latents * self.vae_scale_factor
 
                     # get multiplier for each sample
                     if network_has_multiplier:
@@ -976,6 +976,7 @@ def setup_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, True)
+    deepspeed_utils.add_deepspeed_arguments(parser)
     train_util.add_optimizer_arguments(parser)
     config_util.add_config_arguments(parser)
     custom_train_functions.add_custom_train_arguments(parser)