code: def test_dqn(self):
      # Create a fake environment to test with.
      environment = fakes.DiscreteEnvironment(
          num_actions=5,
          num_observations=10,
          obs_dtype=np.float32,
          episode_length=10,
      )
      spec = specs.make_environment_spec(environment)
  
      # Construct the agent.
      agent = dqn.DQN(
          environment_spec=spec,
          network=_make_network(spec.actions),
          batch_size=10,
          samples_per_insert=2,
          min_replay_size=10,
      )
  
      # Try running the environment loop. We have no assertions here because all
      # we care about is that the agent runs without raising any errors.
      loop = acme.EnvironmentLoop(environment, agent)
      loop.run(num_episodes=2)
  
file_path: acme/acme/agents/tf/dqn/agent_test.py
imports: import acme
  from acme import specs
  from acme.agents.tf import dqn
  from acme.testing import fakes
  import numpy
  import sonnet
  from absl.testing import absltest
label_desc: Use image node_id 1 for calling the DQNTest obj's underlying member method code with example usage: obj.test_dqn() without return types