chore: fix ci lint

Signed-off-by: elijah <[email protected]>

Author: e1ijah1

benchmarks/backend_request_func.py

@@ -423,7 +423,7 @@ def get_tokenizer(
     **kwargs,
 ) -> Union[PreTrainedTokenizer, PreTrainedTokenizerFast]:
     if pretrained_model_name_or_path is not None and not os.path.exists(
-        pretrained_model_name_or_path):
+            pretrained_model_name_or_path):
         pretrained_model_name_or_path = get_model(
             pretrained_model_name_or_path)
     if tokenizer_mode == "slow":
@@ -433,12 +433,13 @@ def get_tokenizer(
         kwargs["use_fast"] = False
     if tokenizer_mode == "mistral":
         try:
-            from vllm.transformers_utils.tokenizer import (
-                MistralTokenizer)
-        except ImportError:
+            from vllm.transformers_utils.tokenizer import MistralTokenizer
+        except ImportError as e:
             raise ImportError(
                 "MistralTokenizer requires vllm package.\n"
-                "Please install it with `pip install vllm` to use mistral tokenizer mode.")
+                "Please install it with `pip install vllm` "
+                "to use mistral tokenizer mode."
+            ) from e
         return MistralTokenizer.from_pretrained(
             str(pretrained_model_name_or_path))
     else: