code: def tearDownClass(cls) -> None:
      ray.shutdown()
  
file_path: ray/rllib/policy/tests/test_policy.py
imports: import unittest
  import ray
  from ray.rllib.algorithms.ppo import PPOConfig
  from ray.rllib.policy.dynamic_tf_policy_v2 import DynamicTFPolicyV2
  from ray.rllib.policy.eager_tf_policy_v2 import EagerTFPolicyV2
  from ray.rllib.policy.policy import Policy
  from ray.rllib.policy.torch_policy_v2 import TorchPolicyV2
  from ray.rllib.utils.test_utils import check, framework_iterator
label_desc: Use image node_id 2 for calling the TestPolicy obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types