fix to work with dreambooth ds without toml

sdxl_train.py

@@ -41,6 +41,7 @@ def train(args):
     ), "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
+    use_dreambooth_method = args.in_json is None
 
     if args.seed is not None:
         set_seed(args.seed)  # 乱数系列を初期化する
@@ -61,6 +62,19 @@ def train(args):
                     )
                 )
         else:
+            if use_dreambooth_method:
+                print("Using DreamBooth method.")
+                user_config = {
+                    "datasets": [
+                        {
+                            "subsets": config_util.generate_dreambooth_subsets_config_by_subdirs(
+                                args.train_data_dir, args.reg_data_dir
+                            )
+                        }
+                    ]
+                }
+            else:
+                print("Training with captions.")
                 user_config = {
                     "datasets": [
                         {