Enable add_prefix_space if model_type is roberta or gpt2 (#12116)

examples/pytorch/token-classification/run_ner.py

@@ -304,13 +304,26 @@ def main():
         revision=model_args.model_revision,
         use_auth_token=True if model_args.use_auth_token else None,
     )
+
+    tokenizer_name_or_path = model_args.tokenizer_name if model_args.tokenizer_name else model_args.model_name_or_path
+    if config.model_type in {"gpt2", "roberta"}:
         tokenizer = AutoTokenizer.from_pretrained(
-        model_args.tokenizer_name if model_args.tokenizer_name else model_args.model_name_or_path,
+            tokenizer_name_or_path,
             cache_dir=model_args.cache_dir,
             use_fast=True,
             revision=model_args.model_revision,
             use_auth_token=True if model_args.use_auth_token else None,
+            add_prefix_space=True,
         )
+    else:
+        tokenizer = AutoTokenizer.from_pretrained(
+            tokenizer_name_or_path,
+            cache_dir=model_args.cache_dir,
+            use_fast=True,
+            revision=model_args.model_revision,
+            use_auth_token=True if model_args.use_auth_token else None,
+        )
+
     model = AutoModelForTokenClassification.from_pretrained(
         model_args.model_name_or_path,
         from_tf=bool(".ckpt" in model_args.model_name_or_path),

examples/pytorch/token-classification/run_ner_no_trainer.py

@@ -317,16 +317,18 @@ def main():
         config = CONFIG_MAPPING[args.model_type]()
         logger.warning("You are instantiating a new config instance from scratch.")
 
-    if args.tokenizer_name:
-        tokenizer = AutoTokenizer.from_pretrained(args.tokenizer_name, use_fast=True)
-    elif args.model_name_or_path:
-        tokenizer = AutoTokenizer.from_pretrained(args.model_name_or_path, use_fast=True)
-    else:
+    tokenizer_name_or_path = args.tokenizer_name if args.tokenizer_name else args.model_name_or_path
+    if not tokenizer_name_or_path:
         raise ValueError(
             "You are instantiating a new tokenizer from scratch. This is not supported by this script."
             "You can do it from another script, save it, and load it from here, using --tokenizer_name."
         )
 
+    if config.model_type in {"gpt2", "roberta"}:
+        tokenizer = AutoTokenizer.from_pretrained(tokenizer_name_or_path, use_fast=True, add_prefix_space=True)
+    else:
+        tokenizer = AutoTokenizer.from_pretrained(tokenizer_name_or_path, use_fast=True)
+
     if args.model_name_or_path:
         model = AutoModelForTokenClassification.from_pretrained(
             args.model_name_or_path,