fix deepseek-vl eval_loss not found bug (modelscope#552)

swift/llm/utils/model.py

@@ -3,7 +3,7 @@
 import os
 import sys
 from contextlib import nullcontext
-from functools import partial, update_wrapper
+from functools import partial, update_wrapper, wraps
 from types import MethodType
 from typing import Any, Callable, Dict, List, NamedTuple, Optional, Tuple, Type
 
@@ -1725,18 +1725,20 @@ def __prepare_inputs_embeds(
 def _patch_deepseek_vl(model) -> None:
     model.prepare_inputs_embeds = MethodType(__prepare_inputs_embeds, model)
 
-    def get_new_func(func_name: str):
+    def _get_new_func(func_name: str):
+        _old_func = getattr(model.language_model, func_name)
 
-        def new_func(*args, **kwargs):
-            return getattr(model.language_model, func_name)(*args, **kwargs)
+        @wraps(_old_func)
+        def _new_func(*args, **kwargs):
+            return _old_func(*args, **kwargs)
 
-        return new_func
+        return _new_func
 
     for key in [
             'generate', 'get_input_embeddings',
             'gradient_checkpointing_enable', 'forward'
     ]:
-        setattr(model, key, get_new_func(key))
+        setattr(model, key, _get_new_func(key))
 
 
 @register_model(