code: def _check_alive(self):
      status = (
          grpc._common.CYGRPC_CONNECTIVITY_STATE_TO_CHANNEL_CONNECTIVITY[
              self._channel._channel.check_connectivity_state(True)
          ]
          if self._channel is not None
          else None
      )
      LOGGER.debug(f"_check_alive: status={status}, mq={self}")
  
      if status == grpc.ChannelConnectivity.SHUTDOWN:
          LOGGER.debug(f"_check_alive: return True, mq={self}")
          return True
      else:
          LOGGER.debug(f"_check_alive: return False, mq={self}")
          return False
  
imports: import json
  import time
  from enum import Enum
  from logging import getLogger
  from typing import Dict, List, Any
  import grpc
  import numpy
  from fate.arch.federation.backends.osx import osx_pb2
  from fate.arch.federation.backends.osx.osx_pb2_grpc import PrivateTransferTransportStub
label_desc: Use image node_id 12 for calling the MQChannel obj's underlying member method code with example usage: obj._check_alive() and returns: True, False