code: def setUp(self):
      super(DynamicClusterTest, self).setUp()
      os.environ["TF_ENABLE_EAGER_CLIENT_STREAMING_ENQUEUE"] = str(
          False
      )
      local_port = pywrap_tfe.TF_PickUnusedPortOrDie()
      context.set_server_def(
          server_def=get_server_def(
              JOB_NAME,
              local_server_port=local_port,
              remote_server_addresses=[
                  self._cached_server1_target,
                  self._cached_server2_target,
              ],
              task_index=0,
          )
      )
  
imports: import os
  import threading
  from absl.testing import parameterized
  import numpy
  from tensorflow.core.distributed_runtime.preemption import gen_check_preemption_op
  from tensorflow.core.protobuf import cluster_pb2
  from tensorflow.core.protobuf import tensorflow_server_pb2
  from tensorflow.python import pywrap_tfe
  from tensorflow.python.eager import context
  from tensorflow.python.eager import def_function
  from tensorflow.python.eager import executor
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
  from tensorflow.python.training import coordinator
  from tensorflow.python.training import server_lib
label_desc: Use image node_id 2 for calling the DynamicClusterTest obj's underlying member method code with example usage: obj.setUp() without return types