[Chore] Clean up pytorch helper functions in vllm.utils (#26908)

Signed-off-by: Isotr0py <mozf@mail2.sysu.edu.cn>
Signed-off-by: isotr0py <2037008807@qq.com>

vllm/model_executor/model_loader/utils.py

@@ -2,7 +2,6 @@
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 """Utilities for selecting and loading models."""
 
-import contextlib
 import inspect
 import warnings
 from contextlib import contextmanager
@@ -32,15 +31,6 @@ from vllm.utils import is_pin_memory_available
 logger = init_logger(__name__)
 
 
-@contextlib.contextmanager
-def set_default_torch_dtype(dtype: torch.dtype):
-    """Sets the default torch dtype to the given dtype."""
-    old_dtype = torch.get_default_dtype()
-    torch.set_default_dtype(dtype)
-    yield
-    torch.set_default_dtype(old_dtype)
-
-
 def initialize_model(
     vllm_config: VllmConfig,
     *,