code: def test_cartpole_lstm(self):
      with ray_start_client_server():
          assert ray.util.client.ray.is_connected()
  
          config = {
              "env": StatelessCartPole,
          }
  
          stop = {
              "training_iteration": 3,
          }
  
          tune.Tuner(
              "PPO",
              param_space=config,
              run_config=air.RunConfig(stop=stop, verbose=2),
          ).fit()
  
file_path: ray/python/ray/rllib/tests/test_ray_client.py
imports: import os
  import sys
  import unittest
  import pytest
  import ray
  from ray import air
  from ray import tune
  import ray.rllib.algorithms.ppo
  from ray.rllib.examples.env.stateless_cartpole import StatelessCartPole
  from ray.util.client.ray_client_helpers import ray_start_client_server
label_desc: Use image node_id 3 for calling the TestRayClient obj's underlying member method code with example usage: obj.test_cartpole_lstm() without return types