code: def shutdown(self):
      self.shutdown_tasks()
      super(SparkDriverService, self).shutdown()
  
imports: import threading
  from horovod.runner.common.service import driver_service
  from horovod.runner.common.util import network
label_desc: Use image node_id 11 for calling the SparkDriverService obj's underlying member method code with example usage: obj.shutdown() without return types