from unittest import mock import pytest import numpy as np from mlagents.tf_utils import tf import yaml from mlagents.trainers.ppo.trainer import PPOTrainer, discount_rewards from mlagents.trainers.ppo.optimizer import PPOOptimizer from mlagents.trainers.policy.nn_policy import NNPolicy from mlagents.trainers.brain import BrainParameters from mlagents.trainers.agent_processor import AgentManagerQueue from mlagents.trainers.tests import mock_brain as mb from mlagents.trainers.tests.mock_brain import make_brain_parameters from mlagents.trainers.tests.test_trajectory import make_fake_trajectory @pytest.fixture def dummy_config(): return yaml.safe_load( """ trainer: ppo batch_size: 32 beta: 5.0e-3 buffer_size: 512 epsilon: 0.2 hidden_units: 128 lambd: 0.95 learning_rate: 3.0e-4 max_steps: 5.0e4 normalize: true num_epoch: 5 num_layers: 2 time_horizon: 64 sequence_length: 64 summary_freq: 1000 use_recurrent: false normalize: true memory_size: 10 curiosity_strength: 0.0 curiosity_enc_size: 1 summary_path: test model_path: test reward_signals: extrinsic: strength: 1.0 gamma: 0.99 """ ) VECTOR_ACTION_SPACE = [2] VECTOR_OBS_SPACE = 8 DISCRETE_ACTION_SPACE = [3, 3, 3, 2] BUFFER_INIT_SAMPLES = 64 NUM_AGENTS = 12 def _create_ppo_optimizer_ops_mock(dummy_config, use_rnn, use_discrete, use_visual): mock_brain = mb.setup_mock_brain( use_discrete, use_visual, vector_action_space=VECTOR_ACTION_SPACE, vector_obs_space=VECTOR_OBS_SPACE, discrete_action_space=DISCRETE_ACTION_SPACE, ) trainer_parameters = dummy_config model_path = "testmodel" trainer_parameters["model_path"] = model_path trainer_parameters["keep_checkpoints"] = 3 trainer_parameters["use_recurrent"] = use_rnn policy = NNPolicy( 0, mock_brain, trainer_parameters, False, False, create_tf_graph=False ) optimizer = PPOOptimizer(policy, trainer_parameters) return optimizer def _create_fake_trajectory(use_discrete, use_visual, time_horizon): if use_discrete: act_space = DISCRETE_ACTION_SPACE else: act_space = VECTOR_ACTION_SPACE if use_visual: num_vis_obs = 1 vec_obs_size = 0 else: num_vis_obs = 0 vec_obs_size = VECTOR_OBS_SPACE trajectory = make_fake_trajectory( length=time_horizon, max_step_complete=True, vec_obs_size=vec_obs_size, num_vis_obs=num_vis_obs, action_space=act_space, ) return trajectory @pytest.mark.parametrize("discrete", [True, False], ids=["discrete", "continuous"]) @pytest.mark.parametrize("visual", [True, False], ids=["visual", "vector"]) @pytest.mark.parametrize("rnn", [True, False], ids=["rnn", "no_rnn"]) def test_ppo_optimizer_update(dummy_config, rnn, visual, discrete): # Test evaluate tf.reset_default_graph() optimizer = _create_ppo_optimizer_ops_mock( dummy_config, use_rnn=rnn, use_discrete=discrete, use_visual=visual ) # Test update update_buffer = mb.simulate_rollout(BUFFER_INIT_SAMPLES, optimizer.policy.brain) # Mock out reward signal eval update_buffer["advantages"] = update_buffer["environment_rewards"] update_buffer["extrinsic_returns"] = update_buffer["environment_rewards"] update_buffer["extrinsic_value_estimates"] = update_buffer["environment_rewards"] optimizer.update( update_buffer, num_sequences=update_buffer.num_experiences // dummy_config["sequence_length"], ) @pytest.mark.parametrize("discrete", [True, False], ids=["discrete", "continuous"]) @pytest.mark.parametrize("visual", [True, False], ids=["visual", "vector"]) @pytest.mark.parametrize("rnn", [True, False], ids=["rnn", "no_rnn"]) def test_ppo_get_value_estimates(dummy_config, rnn, visual, discrete): tf.reset_default_graph() optimizer = _create_ppo_optimizer_ops_mock( dummy_config, use_rnn=rnn, use_discrete=discrete, use_visual=visual ) time_horizon = 15 trajectory = _create_fake_trajectory(discrete, visual, time_horizon) run_out, final_value_out = optimizer.get_trajectory_value_estimates( trajectory.to_agentbuffer(), trajectory.next_obs, done=False ) for key, val in run_out.items(): assert type(key) is str assert len(val) == 15 run_out, final_value_out = optimizer.get_trajectory_value_estimates( trajectory.to_agentbuffer(), trajectory.next_obs, done=True ) for key, val in final_value_out.items(): assert type(key) is str assert val == 0.0 # Check if we ignore terminal states properly optimizer.reward_signals["extrinsic"].use_terminal_states = False run_out, final_value_out = optimizer.get_trajectory_value_estimates( trajectory.to_agentbuffer(), trajectory.next_obs, done=False ) for key, val in final_value_out.items(): assert type(key) is str assert val != 0.0 def test_rl_functions(): rewards = np.array([0.0, 0.0, 0.0, 1.0], dtype=np.float32) gamma = 0.9 returns = discount_rewards(rewards, gamma, 0.0) np.testing.assert_array_almost_equal( returns, np.array([0.729, 0.81, 0.9, 1.0], dtype=np.float32) ) @mock.patch("mlagents.trainers.ppo.trainer.PPOOptimizer") def test_trainer_increment_step(ppo_optimizer, dummy_config): trainer_params = dummy_config mock_optimizer = mock.Mock() mock_optimizer.reward_signals = {} ppo_optimizer.return_value = mock_optimizer brain_params = BrainParameters( brain_name="test_brain", vector_observation_space_size=1, camera_resolutions=[], vector_action_space_size=[2], vector_action_descriptions=[], vector_action_space_type=0, ) trainer = PPOTrainer( brain_params.brain_name, 0, trainer_params, True, False, 0, "0" ) policy_mock = mock.Mock(spec=NNPolicy) policy_mock.get_current_step.return_value = 0 step_count = ( 5 ) # 10 hacked because this function is no longer called through trainer policy_mock.increment_step = mock.Mock(return_value=step_count) trainer.add_policy("testbehavior", policy_mock) trainer._increment_step(5, "testbehavior") policy_mock.increment_step.assert_called_with(5) assert trainer.step == step_count @pytest.mark.parametrize("use_discrete", [True, False]) def test_trainer_update_policy(dummy_config, use_discrete): mock_brain = mb.setup_mock_brain( use_discrete, False, vector_action_space=VECTOR_ACTION_SPACE, vector_obs_space=VECTOR_OBS_SPACE, discrete_action_space=DISCRETE_ACTION_SPACE, ) trainer_params = dummy_config trainer_params["use_recurrent"] = True # Test curiosity reward signal trainer_params["reward_signals"]["curiosity"] = {} trainer_params["reward_signals"]["curiosity"]["strength"] = 1.0 trainer_params["reward_signals"]["curiosity"]["gamma"] = 0.99 trainer_params["reward_signals"]["curiosity"]["encoding_size"] = 128 trainer = PPOTrainer(mock_brain.brain_name, 0, trainer_params, True, False, 0, "0") policy = trainer.create_policy(mock_brain) trainer.add_policy(mock_brain.brain_name, policy) # Test update with sequence length smaller than batch size buffer = mb.simulate_rollout(BUFFER_INIT_SAMPLES, mock_brain) # Mock out reward signal eval buffer["extrinsic_rewards"] = buffer["environment_rewards"] buffer["extrinsic_returns"] = buffer["environment_rewards"] buffer["extrinsic_value_estimates"] = buffer["environment_rewards"] buffer["curiosity_rewards"] = buffer["environment_rewards"] buffer["curiosity_returns"] = buffer["environment_rewards"] buffer["curiosity_value_estimates"] = buffer["environment_rewards"] buffer["advantages"] = buffer["environment_rewards"] trainer.update_buffer = buffer trainer._update_policy() # Make batch length a larger multiple of sequence length trainer.trainer_parameters["batch_size"] = 128 trainer._update_policy() # Make batch length a larger non-multiple of sequence length trainer.trainer_parameters["batch_size"] = 100 trainer._update_policy() def test_process_trajectory(dummy_config): brain_params = BrainParameters( brain_name="test_brain", vector_observation_space_size=1, camera_resolutions=[], vector_action_space_size=[2], vector_action_descriptions=[], vector_action_space_type=0, ) dummy_config["summary_path"] = "./summaries/test_trainer_summary" dummy_config["model_path"] = "./models/test_trainer_models/TestModel" trainer = PPOTrainer(brain_params, 0, dummy_config, True, False, 0, "0") policy = trainer.create_policy(brain_params) trainer.add_policy(brain_params.brain_name, policy) trajectory_queue = AgentManagerQueue("testbrain") trainer.subscribe_trajectory_queue(trajectory_queue) time_horizon = 15 trajectory = make_fake_trajectory( length=time_horizon, max_step_complete=True, vec_obs_size=1, num_vis_obs=0, action_space=[2], ) trajectory_queue.put(trajectory) trainer.advance() # Check that trainer put trajectory in update buffer assert trainer.update_buffer.num_experiences == 15 # Check that GAE worked assert ( "advantages" in trainer.update_buffer and "discounted_returns" in trainer.update_buffer ) # Check that the stats are being collected as episode isn't complete for reward in trainer.collected_rewards.values(): for agent in reward.values(): assert agent > 0 # Add a terminal trajectory trajectory = make_fake_trajectory( length=time_horizon + 1, max_step_complete=False, vec_obs_size=1, num_vis_obs=0, action_space=[2], ) trajectory_queue.put(trajectory) trainer.advance() # Check that the stats are reset as episode is finished for reward in trainer.collected_rewards.values(): for agent in reward.values(): assert agent == 0 assert trainer.stats_reporter.get_stats_summaries("Policy/Extrinsic Reward").num > 0 @mock.patch("mlagents.trainers.ppo.trainer.PPOOptimizer") def test_add_get_policy(ppo_optimizer, dummy_config): brain_params = make_brain_parameters( discrete_action=False, visual_inputs=0, vec_obs_size=6 ) mock_optimizer = mock.Mock() mock_optimizer.reward_signals = {} ppo_optimizer.return_value = mock_optimizer dummy_config["summary_path"] = "./summaries/test_trainer_summary" dummy_config["model_path"] = "./models/test_trainer_models/TestModel" trainer = PPOTrainer(brain_params, 0, dummy_config, True, False, 0, "0") policy = mock.Mock(spec=NNPolicy) policy.get_current_step.return_value = 2000 trainer.add_policy(brain_params.brain_name, policy) assert trainer.get_policy(brain_params.brain_name) == policy # Make sure the summary steps were loaded properly assert trainer.get_step == 2000 assert trainer.next_summary_step > 2000 # Test incorrect class of policy policy = mock.Mock() with pytest.raises(RuntimeError): trainer.add_policy(brain_params, policy) if __name__ == "__main__": pytest.main()