[Minor] Improve code style (#2422)

python/sglang/srt/model_executor/model_runner.py

@@ -242,20 +242,22 @@ class ModelRunner:
                 if torch.cuda.get_device_capability()[1] < 5:
                     raise RuntimeError("SGLang only supports sm75 and above.")
 
-        # Prepare the vllm model config
+        # Prepare the model config
         self.load_config = LoadConfig(
             load_format=self.server_args.load_format,
             download_dir=self.server_args.download_dir,
         )
-
         if self.server_args.load_format == "gguf":
             monkey_patch_vllm_gguf_config()
+
+        # Load the model
         self.model = get_model(
             model_config=self.model_config,
             load_config=self.load_config,
             device_config=DeviceConfig(self.device),
         )
 
+        # Parse other args
         self.sliding_window_size = (
             self.model.get_attention_sliding_window_size()
             if hasattr(self.model, "get_attention_sliding_window_size")
@@ -270,8 +272,10 @@ class ModelRunner:
             f"avail mem={get_available_gpu_memory(self.device, self.gpu_id):.2f} GB"
         )
 
-    def update_weights_from_disk(self, model_path: str, load_format: str):
-        """Update engine weights online from disk."""
+    def update_weights_from_disk(
+        self, model_path: str, load_format: str
+    ) -> tuple[bool, str]:
+        """Update engine weights in-place from the disk."""
         from sglang.srt.model_loader.loader import (
             DefaultModelLoader,
             device_loading_context,