(self, input_dicts, data_id, log_id)
preprocess
        
        In preprocess stage, assembling data for process stage. users can 
        override this function for model feed features.

        Args:
            input_dicts: input data to be preprocessed
            data_id: inner unique id, increase auto
            log_id: global unique id for RTT, 0 default

        Return:
            output_data: data for process stage
            is_skip_process: skip process stage or not, False default
            prod_errcode: None default, otherwise, product errores occured.
                          It is handled in the same way as exception. 
            prod_errinfo: "" default
preprocess
        
        In preprocess stage, assembling data for process stage. users can 
        override this function for model feed features.
preprocess In preprocess stage assembling data for process stage . users can override this function for model feed features .
def preprocess(self, input_dicts, data_id, log_id):
        """preprocess
        
        In preprocess stage, assembling data for process stage. users can 
        override this function for model feed features.

        Args:
            input_dicts: input data to be preprocessed
            data_id: inner unique id, increase auto
            log_id: global unique id for RTT, 0 default

        Return:
            output_data: data for process stage
            is_skip_process: skip process stage or not, False default
            prod_errcode: None default, otherwise, product errores occured.
                          It is handled in the same way as exception. 
            prod_errinfo: "" default
        """
        pass
def preprocess ( self , input_dicts , data_id , log_id ) : pass