Add update_weights_from_tensor (#2631)

python/sglang/srt/model_executor/model_runner.py

@@ -429,6 +429,10 @@ class ModelRunner:
             logger.error(error_msg)
             return False, error_msg
 
+    def update_weights_from_tensor(self, name, tensor: torch.Tensor):
+        self.model.load_weights([(name, tensor)])
+        return True, "Success"  # TODO error handling
+
     def get_weights_by_name(
         self, name: str, truncate_size: int = 100
     ) -> Optional[torch.Tensor]: