code: def _task_fn(index, num_hosts, driver_addresses, settings):
      task = task_service.HorovodRunTaskService(
          index, settings.key, settings.nics
      )
      try:
          driver = driver_service.HorovodRunDriverClient(
              driver_addresses, settings.key, settings.verbose
          )
          driver.register_task(
              index, task.addresses(), host_hash.host_hash()
          )
          task.wait_for_initial_registration(settings.start_timeout)
          # Tasks ping each other in a circular fashion to determine interfaces
          # reachable within the cluster.
          next_task_index = (index + 1) % num_hosts
          next_task_addresses = driver.all_task_addresses(
              next_task_index
          )
          # We request interface matching to weed out all the NAT'ed interfaces.
          next_task = task_service.HorovodRunTaskClient(
              next_task_index,
              next_task_addresses,
              settings.key,
              settings.verbose,
              match_intf=True,
              attempts=10,
          )
          driver.register_task_to_task_addresses(
              next_task_index, next_task.addresses()
          )
          # Notify the next task that the address checks are completed.
          next_task.task_to_task_address_check_completed()
          # Wait to get a notification from previous task that its address checks
          # are completed as well.
          task.wait_for_task_to_task_address_check_finish_signal(
              settings.start_timeout
          )
  
      finally:
          task.shutdown()
  
imports: import sys
  from horovod.runner.common.util import codec, host_hash
  from horovod.runner.driver import driver_service
  from horovod.runner.task import task_service
label_desc: Use image node_id 1 for calling a global function with example usage: _task_fn(index, num_hosts, driver_addresses, settings) without return types