code: def shutdown(self):
      self._send(ShutdownRequest())
  
imports: import threading
  from horovod.runner.common.util import timeout, network
  from horovod.runner.common.util.network import AckResponse
  from horovod.runner.common.util.timeout import TimeoutException
  from horovod.runner.util.threads import in_thread
label_desc: Use image node_id 6 for calling the ComputeClient obj's underlying member method code with example usage: obj.shutdown() without return types