code: def testClusterSpecAsInput(self):
      cluster_spec = server_lib.ClusterSpec(
          {
              "chief": ["127.0.0.1:1234"],
              "worker": ["127.0.0.1:8964", "127.0.0.1:2333"],
              "ps": ["127.0.0.1:1926", "127.0.0.1:3141"],
          }
      )
      self.assert_same_cluster(
          cluster_spec,
          multi_worker_util.normalize_cluster_spec(cluster_spec),
      )
  
imports: from tensorflow.core.protobuf import cluster_pb2
  from tensorflow.python.distribute import multi_worker_util
  from tensorflow.python.eager import test
  from tensorflow.python.training import server_lib
label_desc: Use image node_id 4 for calling the NormalizeClusterSpecTest obj's underlying member method code with example usage: obj.testClusterSpecAsInput() without return types