code: def _init_groups(self):
          
          for group_id, conf in self.group_conf.items():
              self.parent_input_dict[group_id] = Queue(conf.get('input_max_size', 0))
              self.parent_output_dict[group_id] = Queue(conf.get('output_max_size', 0))
docs: 初始化group数据
          :return: