nits

src/transformers/tokenization_utils_base.py

@@ -2230,7 +2230,7 @@ def _from_pretrained(
 
             # allows converting a fast -> slow: add the `tokenizer.json`'s `"added_tokens"` to the slow tokenizer
             # if `tokenizer_config.json` is `None`
-            if "Fast" not in cls.__name__ and tokenizer_file is not None:
+            if tokenizer_file is not None:
                 # This is for slow so can be done before
                 with open(tokenizer_file, encoding="utf-8") as tokenizer_file_handle:
                     tokenizer_file_handle = json.load(tokenizer_file_handle)