code: def _start(self):
      if self._started:
          return
      self._active = True
      self._started = True
      if self._state:
          self._state.start()
  
      for w in self._workers:
          w.daemon = True
          w.start()
  
imports: import logging
  import threading
  import atexit
  import time
  import collections
  import traceback
  from abc import ABCMeta, abstractmethod
label_desc: Use image node_id 4 for calling the WorkerCoordinator obj's underlying member method code with example usage: obj._start() without return types