code: def cancel(self):
      self._get_channel()
      return self._channel.cancel()
  
file_path: FATE/python/fate/arch/federation/backends/rabbitmq/_mq_channel.py
imports: import json
  import logging
  import pika
  from fate.arch.federation.message_queue import nretry
label_desc: Use image node_id 7 for calling the MQChannel obj's underlying member method code with example usage: obj.cancel() and returns: self