support tokenizer caching for offline training/gen

gen_img_diffusers.py

@@ -80,6 +80,7 @@ from PIL import Image
 from PIL.PngImagePlugin import PngInfo
 
 import library.model_util as model_util
+import library.train_util as train_util
 import tools.original_control_net as original_control_net
 from tools.original_control_net import ControlNetInfo
 
@@ -1963,10 +1964,7 @@ def main(args):
   # tokenizerを読み込む
   print("loading tokenizer")
   if use_stable_diffusion_format:
-    if args.v2:
-      tokenizer = CLIPTokenizer.from_pretrained(V2_STABLE_DIFFUSION_PATH, subfolder="tokenizer")
-    else:
-      tokenizer = CLIPTokenizer.from_pretrained(TOKENIZER_PATH)  # , model_max_length=max_token_length + 2)
+    tokenizer = train_util.load_tokenizer(args)
 
   # schedulerを用意する
   sched_init_args = {}
@@ -2715,6 +2713,8 @@ if __name__ == '__main__':
   parser.add_argument("--ckpt", type=str, default=None, help="path to checkpoint of model / モデルのcheckpointファイルまたはディレクトリ")
   parser.add_argument("--vae", type=str, default=None,
                       help="path to checkpoint of vae to replace / VAEを入れ替える場合、VAEのcheckpointファイルまたはディレクトリ")
+  parser.add_argument("--tokenizer_cache_dir", type=str, default=None,
+                      help="directory for caching Tokenizer (for offline training) / Tokenizerをキャッシュするディレクトリ（ネット接続なしでの学習のため）")
   # parser.add_argument("--replace_clip_l14_336", action='store_true',
   #                     help="Replace CLIP (Text Encoder) to l/14@336 / CLIP(Text Encoder)をl/14@336に入れ替える")
   parser.add_argument("--seed", type=int, default=None,

library/train_util.py

@@ -1369,6 +1369,8 @@ def add_sd_models_arguments(parser: argparse.ArgumentParser):
                       help='enable v-parameterization training / v-parameterization学習を有効にする')
   parser.add_argument("--pretrained_model_name_or_path", type=str, default=None,
                       help="pretrained model to train, directory to Diffusers model or StableDiffusion checkpoint / 学習元モデル、Diffusers形式モデルのディレクトリまたはStableDiffusionのckptファイル")
+  parser.add_argument("--tokenizer_cache_dir", type=str, default=None,
+                      help="directory for caching Tokenizer (for offline training) / Tokenizerをキャッシュするディレクトリ（ネット接続なしでの学習のため）")
 
 
 def add_optimizer_arguments(parser: argparse.ArgumentParser):
@@ -1796,12 +1798,28 @@ def prepare_dataset_args(args: argparse.Namespace, support_metadata: bool):
 
 def load_tokenizer(args: argparse.Namespace):
   print("prepare tokenizer")
+  original_path = V2_STABLE_DIFFUSION_PATH if args.v2 else TOKENIZER_PATH
+
+  tokenizer: 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}")
+      tokenizer = CLIPTokenizer.from_pretrained(local_tokenizer_path)                   # same for v1 and v2
+
+  if tokenizer is None:
     if args.v2:
-    tokenizer = CLIPTokenizer.from_pretrained(V2_STABLE_DIFFUSION_PATH, subfolder="tokenizer")
+      tokenizer = CLIPTokenizer.from_pretrained(original_path, subfolder="tokenizer")
     else:
-    tokenizer = CLIPTokenizer.from_pretrained(TOKENIZER_PATH)
-  if args.max_token_length is not None:
+      tokenizer = CLIPTokenizer.from_pretrained(original_path)
+
+  if hasattr(args, "max_token_length") and args.max_token_length is not None:
     print(f"update token length: {args.max_token_length}")
+
+  if args.tokenizer_cache_dir and not os.path.exists(local_tokenizer_path):
+    print(f"save Tokenizer to cache: {local_tokenizer_path}")
+    tokenizer.save_pretrained(local_tokenizer_path)
+
   return tokenizer