code: def testClusterIsAlive(self):
      self.assertTrue(
          context.check_alive("/job:worker/replica:0/task:0")
      )
      self.assertTrue(
          context.check_alive("/job:worker/replica:0/task:1")
      )
      self.assertTrue(context.check_alive("/job:ps/replica:0/task:0"))
      self.assertTrue(
          context.check_alive("/job:chief/replica:0/task:0")
      )
  
file_path: tensorflow/tensorflow/python/distribute/multi_worker_test_base_test.py
imports: from tensorflow.python.distribute import multi_process_runner
  from tensorflow.python.distribute import multi_worker_test_base
  from tensorflow.python.eager import context
  from tensorflow.python.eager import remote
  from tensorflow.python.eager import test
label_desc: Use image node_id 2 for calling the MultiProcessClusterTest obj's underlying member method code with example usage: obj.testClusterIsAlive() without return types