code: def tearDownClass(cls) -> None:
      ray.shutdown()
  
file_path: ray/python/ray/rllib/tests/test_dnc.py
imports: import gymnasium
  import unittest
  import ray
  from ray import air
  from ray import tune
  from ray.rllib.algorithms.ppo import PPOConfig
  from ray.rllib.examples.env.stateless_cartpole import StatelessCartPole
  from ray.rllib.models.catalog import ModelCatalog
  from ray.rllib.examples.models.neural_computer import DNCMemory
  from ray.rllib.utils.framework import try_import_torch
label_desc: Use image node_id 2 for calling the TestDNC obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types