add .isort.cfg (#378)

python/sglang/srt/hf_transformers_utils.py

@@ -3,10 +3,9 @@
 import json
 import os
 import warnings
-from typing import List, Optional, Tuple, Union
+from typing import Optional, Union
 
 from huggingface_hub import snapshot_download
-from sglang.srt.utils import is_multimodal_model
 from transformers import (
     AutoConfig,
     AutoProcessor,
@@ -15,6 +14,8 @@ from transformers import (
     PreTrainedTokenizerFast,
 )
 
+from sglang.srt.utils import is_multimodal_model
+
 
 def download_from_hf(model_path: str):
     if os.path.exists(model_path):