code: def setUpClass(cls):
      ray.init(num_cpus=5)
  
file_path: ray/rllib/tests/test_perf.py
imports: import gymnasium
  import time
  import unittest
  import ray
  from ray.rllib.algorithms.algorithm_config import AlgorithmConfig
  from ray.rllib.evaluation.rollout_worker import RolloutWorker
  from ray.rllib.evaluation.tests.test_rollout_worker import MockPolicy
label_desc: Use image node_id 1 for calling the TestPerf obj's underlying member method code with example usage: obj.setUpClass(cls) without return types