[CI]revert initialize_model context manager (#38426)

Signed-off-by: Kunshang Ji <jikunshang95@gmail.com>
Co-authored-by: wang.yuqi <yuqi.wang@daocloud.io>

vllm/model_executor/model_loader/base_loader.py

@@ -50,10 +50,14 @@ class BaseModelLoader(ABC):
             device_config.device if load_config.device is None else load_config.device
         )
         target_device = torch.device(load_device)
-        with set_default_torch_dtype(model_config.dtype), target_device:
+        with set_default_torch_dtype(model_config.dtype):
+            with target_device:
                 model = initialize_model(
-                vllm_config=vllm_config, model_config=model_config, prefix=prefix
+                    vllm_config=vllm_config,
+                    model_config=model_config,
+                    prefix=prefix,
                 )
+
             log_model_inspection(model)
 
             logger.debug("Loading weights on %s ...", load_device)