code: def testPSFailureWhileRecoveryFromWokerFailure(self):
      model = self._create_model_and_run_indefinitely()
  
      time.sleep(1)
      self.assertFalse(self.cluster_coord.done())
  
      def kill(task):
          self._cluster.kill_task(task, 0)
          self.sleep(1)
          self._cluster.start_task(task, 0)
  
      kill_thread_1 = threading.Thread(target=kill, args=("worker",))
      kill_thread_2 = threading.Thread(target=kill, args=("ps",))
      kill_thread_1.start()
      kill_thread_2.start()
      kill_thread_1.join()
      kill_thread_2.join()
  
      with self.assertRaises(
          (errors.UnavailableError, errors.InvalidArgumentError)
      ):
          model.join_training_functions()
  
imports: import gc
  import os
  import sys
  import threading
  import time
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.distribute import multi_worker_test_base
  from tensorflow.python.distribute import parameter_server_strategy_v2
  from tensorflow.python.distribute import test_util
  from tensorflow.python.distribute.cluster_resolver.cluster_resolver import SimpleClusterResolver
  from tensorflow.python.distribute.coordinator import cluster_coordinator
  from tensorflow.python.eager import context
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import check_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import random_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import tf_logging
  from tensorflow.python.training import coordinator
  from tensorflow.python.training import server_lib
label_desc: Use image node_id 18 for calling the BaseFaultToleranceTest obj's underlying member method code with example usage: obj.testPSFailureWhileRecoveryFromWokerFailure() without return types