import pytest import numpy as np from mlagents.tf_utils import tf from mlagents.trainers.policy.tf_policy import TFPolicy from mlagents.trainers.tf.models import ModelUtils, Tensor3DShape from mlagents.trainers.exception import UnityTrainerException from mlagents.trainers.tests import mock_brain as mb from mlagents.trainers.settings import TrainerSettings, NetworkSettings, EncoderType from mlagents.trainers.tests.test_trajectory import make_fake_trajectory VECTOR_ACTION_SPACE = 2 VECTOR_OBS_SPACE = 8 DISCRETE_ACTION_SPACE = [3, 3, 3, 2] BUFFER_INIT_SAMPLES = 32 NUM_AGENTS = 12 EPSILON = 1e-7 def create_policy_mock( dummy_config: TrainerSettings, use_rnn: bool = False, use_discrete: bool = True, use_visual: bool = False, seed: int = 0, ) -> TFPolicy: mock_spec = mb.setup_test_behavior_specs( use_discrete, use_visual, vector_action_space=DISCRETE_ACTION_SPACE if use_discrete else VECTOR_ACTION_SPACE, vector_obs_space=VECTOR_OBS_SPACE, ) trainer_settings = dummy_config trainer_settings.keep_checkpoints = 3 trainer_settings.network_settings.memory = ( NetworkSettings.MemorySettings() if use_rnn else None ) policy = TFPolicy(seed, mock_spec, trainer_settings) return policy def _compare_two_policies(policy1: TFPolicy, policy2: TFPolicy) -> None: """ Make sure two policies have the same output for the same input. """ decision_step, _ = mb.create_steps_from_behavior_spec( policy1.behavior_spec, num_agents=1 ) run_out1 = policy1.evaluate(decision_step, list(decision_step.agent_id)) run_out2 = policy2.evaluate(decision_step, list(decision_step.agent_id)) np.testing.assert_array_equal(run_out2["log_probs"], run_out1["log_probs"]) @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_policy_evaluate(rnn, visual, discrete): # Test evaluate tf.reset_default_graph() policy = create_policy_mock( TrainerSettings(), use_rnn=rnn, use_discrete=discrete, use_visual=visual ) decision_step, terminal_step = mb.create_steps_from_behavior_spec( policy.behavior_spec, num_agents=NUM_AGENTS ) run_out = policy.evaluate(decision_step, list(decision_step.agent_id)) if discrete: run_out["action"].shape == (NUM_AGENTS, len(DISCRETE_ACTION_SPACE)) else: assert run_out["action"].shape == (NUM_AGENTS, VECTOR_ACTION_SPACE) def test_large_normalization(): behavior_spec = mb.setup_test_behavior_specs( use_discrete=True, use_visual=False, vector_action_space=[2], vector_obs_space=1 ) # Taken from Walker seed 3713 which causes NaN without proper initialization large_obs1 = [ 1800.00036621, 1799.96972656, 1800.01245117, 1800.07214355, 1800.02758789, 1799.98303223, 1799.88647461, 1799.89575195, 1800.03479004, 1800.14025879, 1800.17675781, 1800.20581055, 1800.33740234, 1800.36450195, 1800.43457031, 1800.45544434, 1800.44604492, 1800.56713867, 1800.73901367, ] large_obs2 = [ 1799.99975586, 1799.96679688, 1799.92980957, 1799.89550781, 1799.93774414, 1799.95300293, 1799.94067383, 1799.92993164, 1799.84057617, 1799.69873047, 1799.70605469, 1799.82849121, 1799.85095215, 1799.76977539, 1799.78283691, 1799.76708984, 1799.67163086, 1799.59191895, 1799.5135498, 1799.45556641, 1799.3717041, ] policy = TFPolicy( 0, behavior_spec, TrainerSettings(network_settings=NetworkSettings(normalize=True)), "testdir", False, ) time_horizon = len(large_obs1) trajectory = make_fake_trajectory( length=time_horizon, max_step_complete=True, observation_shapes=[(1,)], action_spec=behavior_spec.action_spec, ) for i in range(time_horizon): trajectory.steps[i].obs[0] = np.array([large_obs1[i]], dtype=np.float32) trajectory_buffer = trajectory.to_agentbuffer() policy.update_normalization(trajectory_buffer["vector_obs"]) # Check that the running mean and variance is correct steps, mean, variance = policy.sess.run( [policy.normalization_steps, policy.running_mean, policy.running_variance] ) assert mean[0] == pytest.approx(np.mean(large_obs1, dtype=np.float32), abs=0.01) assert variance[0] / steps == pytest.approx( np.var(large_obs1, dtype=np.float32), abs=0.01 ) time_horizon = len(large_obs2) trajectory = make_fake_trajectory( length=time_horizon, max_step_complete=True, observation_shapes=[(1,)], action_spec=behavior_spec.action_spec, ) for i in range(time_horizon): trajectory.steps[i].obs[0] = np.array([large_obs2[i]], dtype=np.float32) trajectory_buffer = trajectory.to_agentbuffer() policy.update_normalization(trajectory_buffer["vector_obs"]) steps, mean, variance = policy.sess.run( [policy.normalization_steps, policy.running_mean, policy.running_variance] ) assert mean[0] == pytest.approx( np.mean(large_obs1 + large_obs2, dtype=np.float32), abs=0.01 ) assert variance[0] / steps == pytest.approx( np.var(large_obs1 + large_obs2, dtype=np.float32), abs=0.01 ) def test_normalization(): behavior_spec = mb.setup_test_behavior_specs( use_discrete=True, use_visual=False, vector_action_space=[2], vector_obs_space=1 ) time_horizon = 6 trajectory = make_fake_trajectory( length=time_horizon, max_step_complete=True, observation_shapes=[(1,)], action_spec=behavior_spec.action_spec, ) # Change half of the obs to 0 for i in range(3): trajectory.steps[i].obs[0] = np.zeros(1, dtype=np.float32) policy = TFPolicy( 0, behavior_spec, TrainerSettings(network_settings=NetworkSettings(normalize=True)), "testdir", False, ) trajectory_buffer = trajectory.to_agentbuffer() policy.update_normalization(trajectory_buffer["vector_obs"]) # Check that the running mean and variance is correct steps, mean, variance = policy.sess.run( [policy.normalization_steps, policy.running_mean, policy.running_variance] ) assert steps == 6 assert mean[0] == 0.5 # Note: variance is initalized to the variance of the initial trajectory + EPSILON # (to avoid divide by 0) and multiplied by the number of steps. The correct answer is 0.25 assert variance[0] / steps == pytest.approx(0.25, abs=0.01) # Make another update, this time with all 1's time_horizon = 10 trajectory = make_fake_trajectory( length=time_horizon, max_step_complete=True, observation_shapes=[(1,)], action_spec=behavior_spec.action_spec, ) trajectory_buffer = trajectory.to_agentbuffer() policy.update_normalization(trajectory_buffer["vector_obs"]) # Check that the running mean and variance is correct steps, mean, variance = policy.sess.run( [policy.normalization_steps, policy.running_mean, policy.running_variance] ) assert steps == 16 assert mean[0] == 0.8125 assert variance[0] / steps == pytest.approx(0.152, abs=0.01) def test_min_visual_size(): # Make sure each EncoderType has an entry in MIS_RESOLUTION_FOR_ENCODER assert set(ModelUtils.MIN_RESOLUTION_FOR_ENCODER.keys()) == set(EncoderType) for encoder_type in EncoderType: with tf.Graph().as_default(): good_size = ModelUtils.MIN_RESOLUTION_FOR_ENCODER[encoder_type] good_res = Tensor3DShape(width=good_size, height=good_size, num_channels=3) vis_input = ModelUtils.create_visual_input(good_res, "test_min_visual_size") ModelUtils._check_resolution_for_encoder(vis_input, encoder_type) enc_func = ModelUtils.get_encoder_for_type(encoder_type) enc_func(vis_input, 32, ModelUtils.swish, 1, "test", False) # Anything under the min size should raise an exception. If not, decrease the min size! with pytest.raises(Exception): with tf.Graph().as_default(): bad_size = ModelUtils.MIN_RESOLUTION_FOR_ENCODER[encoder_type] - 1 bad_res = Tensor3DShape(width=bad_size, height=bad_size, num_channels=3) vis_input = ModelUtils.create_visual_input( bad_res, "test_min_visual_size" ) with pytest.raises(UnityTrainerException): # Make sure we'd hit a friendly error during model setup time. ModelUtils._check_resolution_for_encoder(vis_input, encoder_type) enc_func = ModelUtils.get_encoder_for_type(encoder_type) enc_func(vis_input, 32, ModelUtils.swish, 1, "test", False) def test_step_overflow(): behavior_spec = mb.setup_test_behavior_specs( use_discrete=True, use_visual=False, vector_action_space=[2], vector_obs_space=1 ) policy = TFPolicy( 0, behavior_spec, TrainerSettings(network_settings=NetworkSettings(normalize=True)), create_tf_graph=False, ) policy.create_input_placeholders() policy.initialize() policy.set_step(2 ** 31 - 1) assert policy.get_current_step() == 2 ** 31 - 1 policy.increment_step(3) assert policy.get_current_step() == 2 ** 31 + 2 if __name__ == "__main__": pytest.main()