override pipeline by tasks name after finetune done, avoid case like fill mask pipeline with a text cls task

Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/10554512

modelscope/trainers/hooks/checkpoint_hook.py

@@ -172,12 +172,17 @@ class CheckpointHook(Hook):
         else:
             model = trainer.model
 
+        config = trainer.cfg.to_dict()
+        # override pipeline by tasks name after finetune done,
+        # avoid case like fill mask pipeline with a text cls task
+        config['pipeline'] = {'type': config['task']}
+
         if hasattr(model, 'save_pretrained'):
             model.save_pretrained(
                 output_dir,
                 ModelFile.TORCH_MODEL_BIN_FILE,
                 save_function=save_checkpoint,
-                config=trainer.cfg.to_dict(),
+                config=config,
                 with_meta=False)
 
     def after_train_iter(self, trainer):