code: def testAllTasksHealthy(self):
      time.sleep(_PULL_FREQ_IN_SEC * 1.5)
      self.assertLen(self.states, self.num_workers + self.num_ps)
      for state in self.states:
          self.assertIsNone(state)
  
imports: import time
  from tensorflow.core.lib.core import error_codes_pb2
  from tensorflow.python.compat import v2_compat
  from tensorflow.python.distribute import multi_process_runner
  from tensorflow.python.distribute import multi_worker_test_base
  from tensorflow.python.distribute import parameter_server_strategy_v2
  from tensorflow.python.distribute.cluster_resolver import cluster_resolver
  from tensorflow.python.distribute.coordinator import cluster_coordinator
  from tensorflow.python.distribute.coordinator import utils
  from tensorflow.python.eager import context
  from tensorflow.python.eager import test
  from tensorflow.python.framework import errors
  from tensorflow.python.training import server_lib
label_desc: Use image node_id 4 for calling the GetTaskStatesTest obj's underlying member method code with example usage: obj.testAllTasksHealthy() without return types