[to #42322933] Fix bug for text generation task model

Fixed the bug for generate method in TaskModelForTextGeneration, which was unavailable due to the upgrade of the transformers library to version 4.24.0

Link: https://code.alibaba-inc.com/Ali-MaaS/MaaS-lib/codereview/10791805

modelscope/models/nlp/task_models/text_generation.py

@@ -2,7 +2,7 @@
 from typing import Any, Dict
 
 import numpy as np
-from transformers.modeling_utils import GenerationMixin
+from transformers.modeling_utils import PreTrainedModel
 
 from modelscope.metainfo import TaskModels
 from modelscope.models.builder import MODELS
@@ -17,8 +17,7 @@ __all__ = ['TaskModelForTextGeneration']
 
 @MODELS.register_module(
     Tasks.text_generation, module_name=TaskModels.text_generation)
-class TaskModelForTextGeneration(SingleBackboneTaskModelBase, GenerationMixin):
-    main_input_name = 'input_ids'
+class TaskModelForTextGeneration(SingleBackboneTaskModelBase, PreTrainedModel):
 
     def __init__(self, model_dir: str, *args, **kwargs):
         """initialize the text generation model from the `model_dir` path.