fix multi-modal padding_free for seq_cls (#6087)

Co-authored-by: tastelikefeet <[email protected]>

Author: tastelikefeet

swift/trainers/mixin.py

@@ -655,13 +655,14 @@ def revert_padding_free_hook(module, args, input, output):
             elif self.args.task_type == 'seq_cls':
                 llm_model = get_llm_model(self.model, model_meta=self.model.model_meta)
 
-                def seq_cls_forward(model, **kwargs):
+                @wraps(model.forward.__func__)
+                def seq_cls_forward(model, *args, **kwargs):
 
-                    def inner_forward(**kwargs):
-                        output = llm_model.forward(**kwargs)
+                    def inner_forward(*args, **kwargs):
+                        output = llm_model.forward(*args, **kwargs)
                         return revert_padding_free(output, kwargs, self.args.padding_side)
 
-                    return transformers_seq_cls_forward(model, origin_forward=inner_forward, **kwargs)
+                    return transformers_seq_cls_forward(model, *args, origin_forward=inner_forward, **kwargs)
 
                 model.forward = MethodType(seq_cls_forward, model)
             elif self.args.task_type == 'reranker':