diff --git a/vllm/executor/ray_gpu_executor.py b/vllm/executor/ray_gpu_executor.py
index bc5d7f2102a6b..62594d72ae266 100644
--- a/vllm/executor/ray_gpu_executor.py
+++ b/vllm/executor/ray_gpu_executor.py
@@ -2,7 +2,7 @@
 import os
 from collections import defaultdict
 from itertools import islice, repeat
-from typing import TYPE_CHECKING, Any, DefaultDict, Dict, List, Optional, Tuple, Union
+from typing import TYPE_CHECKING, Any, Dict, List, Optional, Tuple, Union
 
 import msgspec
 
@@ -53,8 +53,9 @@ def _init_executor(self) -> None:
                 "VLLM_USE_RAY_COMPILED_DAG=1")
 
         assert self.uses_ray
-        placement_group: Optional["PlacementGroup"] = self.parallel_config.placement_group
-
+        placement_group: Optional[PlacementGroup] = (
+            self.parallel_config.placement_group
+        )
         # Disable Ray usage stats collection.
         ray_usage = os.environ.get("RAY_USAGE_STATS_ENABLED", "0")
         if ray_usage != "1":
@@ -205,9 +206,10 @@ def sort_by_driver_then_worker_ip(worker):
             worker_node_and_gpu_ids.append(
                 ray.get(worker.get_node_and_gpu_ids.remote()) \
             ) # type: ignore
-
-        node_workers = defaultdict[str, list[int]](list)  # node id -> list of worker ranks
-        node_gpus = defaultdict[str, list[Union[int, str]]](list)  # node id -> list of gpu ids
+        # node id -> list of worker ranks
+        node_workers = defaultdict[str, list[int]](list)
+        # node id -> list of gpu ids
+        node_gpus = defaultdict[str, list[Union[int, str]]](list)
 
         for i, (node_id, gpu_ids) in enumerate(worker_node_and_gpu_ids):
             node_workers[node_id].append(i)