Add option --sample_at_first

docs/train_README-ja.md

@@ -374,6 +374,10 @@ classがひとつで対象が複数の場合、正則化画像フォルダはひ
 
     サンプル出力するステップ数またはエポック数を指定します。この数ごとにサンプル出力します。両方指定するとエポック数が優先されます。
 
+- `--sample_at_first`
+
+    学習開始前にサンプル出力します。学習前との比較ができます。
+
 - `--sample_prompts`
 
     サンプル出力用プロンプトのファイルを指定します。

fine_tune.py

@@ -303,6 +303,9 @@ def fn_recursive_set_mem_eff(module: torch.nn.Module):
         accelerator.print(f"\nepoch {epoch+1}/{num_train_epochs}")
         current_epoch.value = epoch + 1
 
+        # For --sample_at_first
+        train_util.sample_images(accelerator, args, epoch, global_step, accelerator.device, vae, tokenizer, text_encoder, unet)
+
         for m in training_models:
             m.train()
 

library/train_util.py

@@ -2968,6 +2968,9 @@ def add_training_arguments(parser: argparse.ArgumentParser, support_dreambooth:
     parser.add_argument(
         "--sample_every_n_steps", type=int, default=None, help="generate sample images every N steps / 学習中のモデルで指定ステップごとにサンプル出力する"
     )
+    parser.add_argument(
+        "--sample_at_first", action='store_true', help="generate sample images before training / 学習前にサンプル出力する"
+    )
     parser.add_argument(
         "--sample_every_n_epochs",
         type=int,
@@ -4429,15 +4432,19 @@ def sample_images_common(
     """
     StableDiffusionLongPromptWeightingPipelineの改造版を使うようにしたので、clip skipおよびプロンプトの重みづけに対応した
     """
-    if args.sample_every_n_steps is None and args.sample_every_n_epochs is None:
-        return
-    if args.sample_every_n_epochs is not None:
-        # sample_every_n_steps は無視する
-        if epoch is None or epoch % args.sample_every_n_epochs != 0:
+    if steps == 0:
+        if not args.sample_at_first:
             return
     else:
-        if steps % args.sample_every_n_steps != 0 or epoch is not None:  # steps is not divisible or end of epoch
+        if args.sample_every_n_steps is None and args.sample_every_n_epochs is None:
             return
+        if args.sample_every_n_epochs is not None:
+            # sample_every_n_steps は無視する
+            if epoch is None or epoch % args.sample_every_n_epochs != 0:
+                return
+        else:
+            if steps % args.sample_every_n_steps != 0 or epoch is not None:  # steps is not divisible or end of epoch
+                return
 
     print(f"\ngenerating sample images at step / サンプル画像生成 ステップ: {steps}")
     if not os.path.isfile(args.sample_prompts):

sdxl_train.py

@@ -477,6 +477,19 @@ def fn_recursive_set_mem_eff(module: torch.nn.Module):
         accelerator.print(f"\nepoch {epoch+1}/{num_train_epochs}")
         current_epoch.value = epoch + 1
 
+        # For --sample_at_first
+        sdxl_train_util.sample_images(
+            accelerator,
+            args,
+            epoch,
+            global_step,
+            accelerator.device,
+            vae,
+            [tokenizer1, tokenizer2],
+            [text_encoder1, text_encoder2],
+            unet,
+        )
+
         for m in training_models:
             m.train()
 

train_controlnet.py

@@ -373,6 +373,20 @@ def remove_model(old_ckpt_name):
 
     # training loop
     for epoch in range(num_train_epochs):
+        # For --sample_at_first
+        train_util.sample_images(
+            accelerator,
+            args,
+            epoch,
+            global_step,
+            accelerator.device,
+            vae,
+            tokenizer,
+            text_encoder,
+            unet,
+            controlnet=controlnet,
+        )
+
         if is_main_process:
             accelerator.print(f"\nepoch {epoch+1}/{num_train_epochs}")
         current_epoch.value = epoch + 1

train_db.py

@@ -279,6 +279,8 @@ def train(args):
         accelerator.print(f"\nepoch {epoch+1}/{num_train_epochs}")
         current_epoch.value = epoch + 1
 
+        train_util.sample_images(accelerator, args, epoch, global_step, accelerator.device, vae, tokenizer, text_encoder, unet)
+
         # 指定したステップ数までText Encoderを学習する：epoch最初の状態
         unet.train()
         # train==True is required to enable gradient_checkpointing

train_network.py

@@ -749,7 +749,9 @@ def remove_model(old_ckpt_name):
             current_epoch.value = epoch + 1
 
             metadata["ss_epoch"] = str(epoch + 1)
-
+
+            # For --sample_at_first
+            self.sample_images(accelerator, args, epoch, global_step, accelerator.device, vae, tokenizer, text_encoder, unet)
             network.on_epoch_start(text_encoder, unet)
 
             for step, batch in enumerate(train_dataloader):

train_textual_inversion.py

@@ -534,6 +534,20 @@ def remove_model(old_ckpt_name):
             accelerator.print(f"\nepoch {epoch+1}/{num_train_epochs}")
             current_epoch.value = epoch + 1
 
+            # For --sample_at_first
+            self.sample_images(
+                accelerator,
+                args,
+                epoch,
+                global_step,
+                accelerator.device,
+                vae,
+                tokenizer_or_list,
+                text_encoder_or_list,
+                unet,
+                prompt_replacement,
+            )
+
             for text_encoder in text_encoders:
                 text_encoder.train()