code: def test_reverb_integration(self):
      num_envs = 3
      env = parallel_py_environment.ParallelPyEnvironment(
          [lambda: suite_gym.load("CartPole-v0")] * num_envs
      )
  
      policy = random_py_policy.RandomPyPolicy(
          env.time_step_spec(), env.action_spec()
      )
  
      replay_buffer_signature = tensor_spec.from_spec(
          policy.collect_data_spec
      )
      replay_buffer_signature = tensor_spec.add_outer_dim(
          replay_buffer_signature
      )
      table = reverb.Table(
          "experience",
          max_size=100,
          sampler=reverb.selectors.Uniform(),
          remover=reverb.selectors.Fifo(),
          rate_limiter=reverb.rate_limiters.MinSize(1),
          signature=replay_buffer_signature,
      )
      reverb_server = reverb.Server([table])
  
      def create_add_episode_observer():
          return reverb_utils.ReverbAddEpisodeObserver(
              reverb_server.localhost_client(),
              table_name="experience",
              max_sequence_length=200,
          )
  
      rb_observer = (
          batched_observer_unbatching.BatchedObserverUnbatching(
              create_add_episode_observer, batch_size=num_envs
          )
      )
  
      driver = py_driver.PyDriver(
          env, policy, observers=[rb_observer], max_episodes=30
      )
      driver.run(env.reset())
  
file_path: agents/tf_agents/utils/batched_observer_unbatching_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import reverb
  import tensorflow
  from tf_agents.drivers import py_driver
  from tf_agents.environments import parallel_py_environment
  from tf_agents.environments import suite_gym
  from tf_agents.policies import random_py_policy
  from tf_agents.replay_buffers import reverb_utils
  from tf_agents.specs import tensor_spec
  from tf_agents.trajectories import trajectory
  from tf_agents.utils import batched_observer_unbatching
label_desc: Use image node_id 2 for calling the BatchedObserverUnbatchingTest obj's underlying member method code with example usage: obj.test_reverb_integration() and returns: reverb_utils