Address @n1t0 comments.

bindings/python/py_src/tokenizers/models/__init__.pyi

@@ -110,13 +110,8 @@ class Unigram(Model):
        vocab: ('`optional`) string:
            Path to a vocabulary JSON file.
 
-       is_spm_file: ('`optional`) bool:
-           If the file came out of sentencepiece, we need to load it differently
-
     """
 
     @staticmethod
-    def __init__(
-        self, vocab: Optional[str], is_spm_file: Optional[bool],
-    ):
+    def __init__(self, vocab: Optional[str]):
         pass