code: def wait_for_task_shutdown(self):
      self._send(WaitForTaskShutdownRequest())
  
imports: import threading
  from horovod.runner.common.service import driver_service
  from horovod.runner.common.util import network
label_desc: Use image node_id 6 for calling the SparkDriverClient obj's underlying member method code with example usage: obj.wait_for_task_shutdown() without return types