[Code Quality] Add missing return type annotations to model_executor utils

This PR adds missing return type annotations to functions in the
model_executor module to improve code quality and IDE support.

## Changes

### model_executor/utils.py
- `set_weight_attrs()` -> `None`
- `replace_parameter()` -> `None`

### model_executor/model_loader/weight_utils.py
- `enable_hf_transfer()` -> `None`
- `get_lock()` -> `filelock.FileLock`
- `_shared_pointers()` -> `list[list[str]]`
- `enable_tqdm()` -> `bool`

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: yurekami <yurekami@users.noreply.github.com>

vllm/model_executor/model_loader/weight_utils.py

@@ -66,7 +66,7 @@ logger = init_logger(__name__)
 temp_dir = tempfile.gettempdir()
 
 
-def enable_hf_transfer():
+def enable_hf_transfer() -> None:
     """automatically activates hf_transfer"""
     if "HF_HUB_ENABLE_HF_TRANSFER" not in os.environ:
         try:
@@ -87,7 +87,9 @@ class DisabledTqdm(tqdm):
         super().__init__(*args, **kwargs)
 
 
-def get_lock(model_name_or_path: str | Path, cache_dir: str | None = None):
+def get_lock(
+    model_name_or_path: str | Path, cache_dir: str | None = None
+) -> filelock.FileLock:
     lock_dir = cache_dir or temp_dir
     model_name_or_path = str(model_name_or_path)
     os.makedirs(os.path.dirname(lock_dir), exist_ok=True)
@@ -178,11 +180,11 @@ def maybe_download_from_modelscope(
     return None
 
 
-def _shared_pointers(tensors):
-    ptrs = defaultdict(list)
+def _shared_pointers(tensors: dict[str, torch.Tensor]) -> list[list[str]]:
+    ptrs: dict[int, list[str]] = defaultdict(list)
     for k, v in tensors.items():
         ptrs[v.data_ptr()].append(k)
-    failing = []
+    failing: list[list[str]] = []
     for _, names in ptrs.items():
         if len(names) > 1:
             failing.append(names)
@@ -602,7 +604,7 @@ def filter_files_not_needed_for_inference(hf_weights_files: list[str]) -> list[s
 _BAR_FORMAT = "{desc}: {percentage:3.0f}% Completed | {n_fmt}/{total_fmt} [{elapsed}<{remaining}, {rate_fmt}]\n"  # noqa: E501
 
 
-def enable_tqdm(use_tqdm_on_load: bool):
+def enable_tqdm(use_tqdm_on_load: bool) -> bool:
     return use_tqdm_on_load and (
         not torch.distributed.is_initialized() or torch.distributed.get_rank() == 0
     )

vllm/model_executor/utils.py

@@ -19,7 +19,7 @@ def set_random_seed(seed: int | None) -> None:
 def set_weight_attrs(
     weight: torch.Tensor,
     weight_attrs: dict[str, Any] | None,
-):
+) -> None:
     """Set attributes on a weight tensor.
 
     This method is used to set attributes on a weight tensor. This method
@@ -50,7 +50,9 @@ def set_weight_attrs(
         setattr(weight, key, value)
 
 
-def replace_parameter(layer: torch.nn.Module, param_name: str, new_data: torch.Tensor):
+def replace_parameter(
+    layer: torch.nn.Module, param_name: str, new_data: torch.Tensor
+) -> None:
     """
     Replace a parameter of a layer while maintaining the ability to reload the weight.
     Called within implementations of the `process_weights_after_loading` method.