fix

sentencepiece_ja.py

@@ -41,8 +41,8 @@ class SentencePieceJA(PreTrainedTokenizer):
     def _convert_token_to_id(self, token):
         return self._tokenizer.encode(token).ids[0]
         
-    def _convert_id_to_token(self, index: int) -> str:        
-        return self._tokenizer.decode(index)
+    def _convert_id_to_token(self, index: int) -> str:
+        return self._tokenizer.decode([index])
     
     def save_vocabulary(self, save_directory: str, filename_prefix: Optional[str] = None) -> Tuple[str]:
         index = 0