code: def tearDown(self):
      super().tearDown()
      self._cluster.stop()
      self._cluster = None
  
imports: import time
  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 metric_utils
  from tensorflow.python.eager import context
  from tensorflow.python.eager import def_function
  from tensorflow.python.eager import test
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import random_ops
  from tensorflow.python.training import coordinator
  from tensorflow.python.training.server_lib import ClusterSpec
label_desc: Use image node_id 3 for calling the MetricUtilsTest obj's underlying member method code with example usage: obj.tearDown() without return types