code: def tearDown(self):
      ray.shutdown()
      self.cluster.shutdown()
  
file_path: ray/python/ray/rllib/tests/test_node_failure.py
imports: import time
  import unittest
  import ray
  from ray._private.test_utils import get_other_nodes
  from ray.cluster_utils import Cluster
  from ray.util.state import list_actors
  from ray.rllib.algorithms.ppo import PPO, PPOConfig
label_desc: Use image node_id 2 for calling the NodeFailureTests obj's underlying member method code with example usage: obj.tearDown() without return types