Update modeling_minGRULM.py

modeling_minGRULM.py

@@ -137,6 +137,7 @@ class MinGRULMForCausalLM(PreTrainedModel):
             save_directory (str): Directory to save the model.
             safe_serialization (bool, optional): Whether to use safe serialization. Defaults to True.
         """
+        import os
         os.makedirs(save_directory, exist_ok=True)
         
         if safe_serialization: