code: def get_worker_ids(self):
      return self._worker_ids
  
imports: import logging
  import threading
  import atexit
  import time
  import collections
  import traceback
  from abc import ABCMeta, abstractmethod
label_desc: Use image node_id 7 for calling the WorkerCoordinator obj's underlying member method code with example usage: obj.get_worker_ids() and returns: self