code: def test_counters_after_checkpoint(self):
      # We expect algorithm to no start counters from zero after loading a
      # checkpoint on a fresh Algorithm instance
      config = ppo.PPOConfig().environment(env="CartPole-v1")
      algo = config.build()
  
      self.assertTrue(all(c == 0 for c in algo._counters.values()))
      algo.step()
      self.assertTrue((all(c != 0 for c in algo._counters.values())))
      counter_values = list(algo._counters.values())
      state = algo.__getstate__()
      algo.stop()
  
      algo2 = config.build()
      self.assertTrue(all(c == 0 for c in algo2._counters.values()))
      algo2.__setstate__(state)
      counter_values2 = list(algo2._counters.values())
      self.assertEqual(counter_values, counter_values2)
  
imports: import gymnasium
  import numpy
  import os
  from pathlib import Path
  from random import choice
  import time
  import unittest
  import ray
  import ray.rllib.algorithms.dqn
  from ray.rllib.algorithms.bc import BCConfig
  import ray.rllib.algorithms.ppo
  from ray.rllib.examples.env.multi_agent import MultiAgentCartPole
  from ray.rllib.examples.parallel_evaluation_and_training import AssertEvalCallback
  from ray.rllib.utils.metrics.learner_info import LEARNER_INFO
  from ray.rllib.utils.test_utils import check, framework_iterator
label_desc: Use image node_id 10 for calling the TestAlgorithm obj's underlying member method code with example usage: obj.test_counters_after_checkpoint() without return types