code: def setUpClass(cls) -> None:
      ray.init(num_cpus=5)
  
file_path: ray/python/ray/rllib/models/tests/test_attention_nets.py
imports: from gymnasium.spaces import Box, Dict, Discrete, MultiDiscrete, Tuple
  import unittest
  import ray
  from ray import air
  from ray import tune
  from ray.rllib.examples.env.random_env import RandomEnv
  from ray.rllib.examples.env.stateless_cartpole import StatelessCartPole
  from ray.rllib.models.catalog import ModelCatalog
  from ray.rllib.models.tf.attention_net import GTrXLNet
  from ray.rllib.utils.test_utils import framework_iterator
label_desc: Use image node_id 1 for calling the TestAttentionNets obj's underlying member method code with example usage: obj.setUpClass(cls) without return types