code: def testParameterOverrides(self):
      os.environ["SM_HOSTS"] = '["algo-1","algo-2"]'
      os.environ["SM_CURRENT_HOST"] = "algo-1"
  
      cluster_resolver = SageMakerClusterResolver(
          task_type="worker", task_id=0
      )
  
      self.assertEqual("algo-1:2223", cluster_resolver.master())
      self.assertEqual("worker", cluster_resolver.task_type)
      self.assertEqual(0, cluster_resolver.task_id)
  
      cluster_resolver.task_type = "worker"
      cluster_resolver.task_id = 1
      cluster_resolver.rpc_layer = "test"
  
      self.assertEqual("test://algo-2:2223", cluster_resolver.master())
      self.assertEqual("worker", cluster_resolver.task_type)
      self.assertEqual(1, cluster_resolver.task_id)
      self.assertEqual("test", cluster_resolver.rpc_layer)
  
file_path: tensorflow/tensorflow/python/distribute/cluster_resolver/sagemaker_cluster_resolver_test.py
imports: import os
  from tensorflow.python.distribute.cluster_resolver.sagemaker_cluster_resolver import SageMakerClusterResolver
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import test
  from tensorflow.python.training import server_lib
label_desc: Use image node_id 6 for calling the SageMakerClusterResolverTest obj's underlying member method code with example usage: obj.testParameterOverrides() without return types