code: def setUpClass(cls) -> None:
      ray.init(num_cpus=4)
  
file_path: ray/rllib/algorithms/tests/test_algorithm_export_checkpoint.py
imports: import numpy
  import os
  import shutil
  import unittest
  import ray
  from ray.rllib.examples.env.multi_agent import MultiAgentCartPole
  from ray.rllib.policy.sample_batch import DEFAULT_POLICY_ID
  from ray.rllib.utils.framework import try_import_tf, try_import_torch
  from ray.rllib.utils.test_utils import framework_iterator
  from ray.tune.registry import get_trainable_cls
label_desc: Use image node_id 1 for calling the TestAlgorithmSave obj's underlying member method code with example usage: obj.setUpClass(cls) without return types