code: def setUpClass(cls):
      ray.init()
  
file_path: ray/rllib/algorithms/appo/tests/test_appo.py
imports: import unittest
  import ray
  import ray.rllib.algorithms.appo
  from ray.rllib.policy.sample_batch import DEFAULT_POLICY_ID
  from ray.rllib.utils.metrics.learner_info import LEARNER_INFO, LEARNER_STATS_KEY
  from ray.rllib.utils.test_utils import check_compute_single_action, check_train_results, framework_iterator
label_desc: Use image node_id 1 for calling the TestAPPO obj's underlying member method code with example usage: obj.setUpClass(cls) without return types