(self, input_dicts, fetch_dict, data_id, log_id)
postprocess

        In postprocess stage, assemble data for next op or output.
        Args:
            input_data: data returned in preprocess stage, dict(for single predict) or list(for batch predict)
            fetch_data: data returned in process stage, dict(for single predict) or list(for batch predict)
            data_id: inner unique id, increase auto
            log_id: logid, 0 default

        Returns: 
            fetch_dict: fetch result must be dict type.
            prod_errcode: None default, otherwise, product errores occured.
                          It is handled in the same way as exception.
            prod_errinfo: "" default
postprocess
postprocess
def postprocess(self, input_dicts, fetch_dict, data_id, log_id):
        """postprocess

        In postprocess stage, assemble data for next op or output.
        Args:
            input_data: data returned in preprocess stage, dict(for single predict) or list(for batch predict)
            fetch_data: data returned in process stage, dict(for single predict) or list(for batch predict)
            data_id: inner unique id, increase auto
            log_id: logid, 0 default

        Returns: 
            fetch_dict: fetch result must be dict type.
            prod_errcode: None default, otherwise, product errores occured.
                          It is handled in the same way as exception.
            prod_errinfo: "" default
        """
        # postprocess for the service output
        pass
def postprocess ( self , input_dicts , fetch_dict , data_id , log_id ) : # postprocess for the service output pass