def test_limit_duration_wrapped_env_forwards_calls(self):
cartpole_env = gym.spec('CartPole-v1').make()
env = gym_wrapper.GymWrapper(cartpole_env)
env = wrappers.TimeLimit(env, 10)
action_spec = env.action_spec()
self.assertEqual((), action_spec.shape)
self.assertEqual(0, action_spec.minimum)
self.assertEqual(1, action_spec.maximum)
observation_spec = env.observation_spec()
self.assertEqual((4,), observation_spec.shape)
high = np.array([
4.8,
np.finfo(np.float32).max, 2 / 15.0 * math.pi,
np.finfo(np.float32).max
])
np.testing.assert_array_almost_equal(-high, observation_spec.minimum)
np.testing.assert_array_almost_equal(high, observation_spec.maximum)
def __init__(self,
name,
stock_list,
feature_set_factories,
actor_fc_layers=ACTOR_FC_LAYERS,
actor_dropout_layer_params=ACTOR_DROPOUT_LAYER_PARAMS,
critic_observation_fc_layer_params=CRITIC_OBS_FC_LAYERS,
critic_action_fc_layer_params=CRITIC_ACTION_FC_LAYERS,
critic_joint_fc_layer_params=CRITIC_JOINT_FC_LAYERS,
actor_alpha=ACTOR_ALPHA,
critic_alpha=CRITIC_ALPHA,
alpha_alpha=ALPHA_ALPHA,
gamma=GAMMA):
self.name = name
self.stock_list = stock_list
self.feature_generator = FeatureGenerator(feature_set_factories)
self.reset()
action_space = self.action_space = spaces.Box(low=-1.0,
high=1.0,
shape=(1, ),
dtype=np.float32)
self.gym_training_env = TrainingStockEnv(stock_list,
self.feature_generator.copy(),
action_space,
self.convert_action)
self.tf_training_env = tf_py_environment.TFPyEnvironment(
gym_wrapper.GymWrapper(self.gym_training_env,
discount=gamma,
auto_reset=True))
self.actor = self.create_actor_network(actor_fc_layers,
actor_dropout_layer_params)
self.critic = self.create_critic_network(
critic_observation_fc_layer_params, critic_action_fc_layer_params,
critic_joint_fc_layer_params)
self.tf_agent = self.create_sac_agent(self.actor, self.critic,
actor_alpha, critic_alpha,
alpha_alpha, gamma)
self.eval_policy = self.tf_agent.policy
self.eval_env = EvalEnv(self.stock_list, self)
self.tf_agent.initialize()
def test_automatic_reset(self):
cartpole_env = gym.make('CartPole-v1')
env = gym_wrapper.GymWrapper(cartpole_env)
env = wrappers.TimeLimit(env, 2)
# Episode 1
first_time_step = env.step(0)
self.assertTrue(first_time_step.is_first())
mid_time_step = env.step(0)
self.assertTrue(mid_time_step.is_mid())
last_time_step = env.step(0)
self.assertTrue(last_time_step.is_last())
# Episode 2
first_time_step = env.step(0)
self.assertTrue(first_time_step.is_first())
mid_time_step = env.step(0)
self.assertTrue(mid_time_step.is_mid())
last_time_step = env.step(0)
self.assertTrue(last_time_step.is_last())
def test_duration_applied_after_episode_terminates_early(self):
cartpole_env = gym.make('CartPole-v1')
env = gym_wrapper.GymWrapper(cartpole_env)
env = wrappers.TimeLimit(env, 10000)
# Episode 1 stepped until termination occurs.
time_step = env.step(np.array(1, dtype=np.int32))
while not time_step.is_last():
time_step = env.step(np.array(1, dtype=np.int32))
self.assertTrue(time_step.is_last())
env._duration = 2
# Episode 2 short duration hits step limit.
first_time_step = env.step(np.array(0, dtype=np.int32))
self.assertTrue(first_time_step.is_first())
mid_time_step = env.step(np.array(0, dtype=np.int32))
self.assertTrue(mid_time_step.is_mid())
last_time_step = env.step(np.array(0, dtype=np.int32))
self.assertTrue(last_time_step.is_last())
def test_automatic_reset(self):
cartpole_env = gym.make('CartPole-v1')
env = gym_wrapper.GymWrapper(cartpole_env)
env = wrappers.FixedLength(env, 2)
# Episode 1
first_time_step = env.step(np.array(0, dtype=np.int32))
self.assertTrue(first_time_step.is_first())
mid_time_step = env.step(np.array(0, dtype=np.int32))
self.assertTrue(mid_time_step.is_mid())
last_time_step = env.step(np.array(0, dtype=np.int32))
self.assertTrue(last_time_step.is_last())
# Episode 2
first_time_step = env.step(np.array(0, dtype=np.int32))
self.assertTrue(first_time_step.is_first())
mid_time_step = env.step(np.array(0, dtype=np.int32))
self.assertTrue(mid_time_step.is_mid())
last_time_step = env.step(np.array(0, dtype=np.int32))
self.assertTrue(last_time_step.is_last())
def test_wrapped_cartpole_specs(self):
# Note we use spec.make on gym envs to avoid getting a TimeLimit wrapper on
# the environment.
cartpole_env = gym.spec('CartPole-v1').make()
env = gym_wrapper.GymWrapper(cartpole_env)
action_spec = env.action_spec()
self.assertEqual((), action_spec.shape)
self.assertEqual(0, action_spec.minimum)
self.assertEqual(1, action_spec.maximum)
observation_spec = env.observation_spec()
self.assertEqual((4, ), observation_spec.shape)
self.assertEqual(np.float32, observation_spec.dtype)
high = np.array([
4.8,
np.finfo(np.float32).max, 2 / 15.0 * math.pi,
np.finfo(np.float32).max
])
np.testing.assert_array_almost_equal(-high, observation_spec.minimum)
np.testing.assert_array_almost_equal(high, observation_spec.maximum)
def env_load_fn(
environment_name, # pylint: disable=dangerous-default-value
max_episode_steps=50,
resize_factor=1,
env_kwargs=dict(action_noise=0., start=(0, 3)),
goal_env_kwargs=dict(goal=(7, 3)),
terminate_on_timeout=True):
"""Loads the selected environment and wraps it with the specified wrappers.
Args:
environment_name: Name for the environment to load.
max_episode_steps: If None the max_episode_steps will be set to the default
step limit defined in the environment's spec. No limit is applied if set
to 0 or if there is no timestep_limit set in the environment's spec.
resize_factor: A factor for resizing.
env_kwargs: Arguments for envs.
goal_env_kwargs: Arguments for goal envs.
terminate_on_timeout: Whether to set done = True when the max episode steps
is reached.
Returns:
A PyEnvironmentBase instance.
"""
gym_env = PointMassEnv(environment_name,
resize_factor=resize_factor,
**env_kwargs)
gym_env = GoalConditionedPointWrapper(gym_env, **goal_env_kwargs)
env = gym_wrapper.GymWrapper(gym_env,
discount=1.0,
auto_reset=True,
simplify_box_bounds=False)
if max_episode_steps > 0:
if terminate_on_timeout:
env = TimeLimitBonus(env, max_episode_steps)
else:
env = NonTerminatingTimeLimit(env, max_episode_steps)
return env
def env_load_fn(environment_name, max_episode_steps=None, resize_factor=1, gym_env_wrappers=(GoalConditionedPointWrapper,), terminate_on_timeout=False): """Loads the selected environment and wraps it with the specified wrappers. Args: environment_name: Name for the environment to load. max_episode_steps: If None the max_episode_steps will be set to the default step limit defined in the environment's spec. No limit is applied if set to 0 or if there is no timestep_limit set in the environment's spec. gym_env_wrappers: Iterable with references to wrapper classes to use directly on the gym environment. terminate_on_timeout: Whether to set done = True when the max episode steps is reached. Returns: A PyEnvironmentBase instance. """ gym_env = PointEnv(walls=environment_name, resize_factor=resize_factor) for wrapper in gym_env_wrappers: gym_env = wrapper(gym_env) env = gym_wrapper.GymWrapper( gym_env, discount=1.0, auto_reset=True, ) if max_episode_steps > 0: if terminate_on_timeout: env = wrappers.TimeLimit(env, max_episode_steps) else: env = NonTerminatingTimeLimit(env, max_episode_steps) return tf_py_environment.TFPyEnvironment(env)
def get_onpolicy_dataset(env_name, tabular_obs, policy_fn, policy_info_spec):
"""Gets target policy."""
if env_name == 'taxi':
env = taxi.Taxi(tabular_obs=tabular_obs)
elif env_name == 'grid':
env = navigation.GridWalk(tabular_obs=tabular_obs)
elif env_name == 'lowrank_tree':
env = tree.Tree(branching=2, depth=3, duplicate=10)
elif env_name == 'frozenlake':
env = InfiniteFrozenLake()
elif env_name == 'low_rank':
env = low_rank.LowRank()
else:
raise ValueError('Unknown environment: %s.' % env_name)
tf_env = tf_py_environment.TFPyEnvironment(gym_wrapper.GymWrapper(env))
tf_policy = common_utils.TFAgentsWrappedPolicy(tf_env.time_step_spec(),
tf_env.action_spec(),
policy_fn,
policy_info_spec,
emit_log_probability=True)
return TFAgentsOnpolicyDataset(tf_env, tf_policy)
def wrap_env(env,
discount=1.0,
max_episode_steps=0,
gym_env_wrappers=(),
time_limit_wrapper=wrappers.TimeLimit,
env_wrappers=(),
spec_dtype_map=None,
auto_reset=True):
for wrapper in gym_env_wrappers:
gym_env = wrapper(gym_env)
env = gym_wrapper.GymWrapper(env,
discount=discount,
spec_dtype_map=spec_dtype_map,
match_obs_space_dtype=True,
auto_reset=auto_reset,
simplify_box_bounds=True)
if max_episode_steps > 0:
env = time_limit_wrapper(env, max_episode_steps)
for wrapper in env_wrappers:
env = wrapper(env)
return env
def test_automatic_reset_after_create(self):
cartpole_env = gym.spec('CartPole-v1').make()
env = gym_wrapper.GymWrapper(cartpole_env)
first_time_step = env.step(0)
self.assertTrue(first_time_step.is_first())
def test_render(self):
cartpole_env = gym.spec('CartPole-v1').make()
cartpole_env.render = mock.MagicMock()
env = gym_wrapper.GymWrapper(cartpole_env)
env.render()
self.assertEqual(1, cartpole_env.render.call_count)
def get_py_env(env_name,
max_episode_steps=None,
constant_task=None,
use_neg_rew=None,
margin=None):
"""Load an environment.
Args:
env_name: (str) name of the environment.
max_episode_steps: (int) maximum number of steps per episode. Set to None
to not include a limit.
constant_task: specifies a fixed task to use for all episodes. Set to None
to use tasks sampled from the task distribution.
use_neg_rew: (bool) For the goal-reaching tasks, indicates whether to use
a (-1, 0) sparse reward (use_neg_reward = True) or a (0, 1) sparse reward.
margin: (float) For goal-reaching tasks, indicates the desired distance
to the goal.
Returns:
env: the environment, build from a dynamics and task distribution
task_distribution: the task distribution used for the environment.
"""
if "sawyer" in env_name:
print(("ERROR: Modify utils.py to import sawyer_env and not dm_env. "
"Currently the sawyer_env import is commented out to prevent "
"a segfault from occuring when trying to import both sawyer_env "
"and dm_env"))
assert False
if env_name.split("_")[0] == "point":
_, walls, resize_factor = env_name.split("_")
dynamics = point_env.PointDynamics(
walls=walls, resize_factor=int(resize_factor))
task_distribution = point_env.PointGoalDistribution(dynamics)
elif env_name.split("_")[0] == "pointTask":
_, walls, resize_factor = env_name.split("_")
dynamics = point_env.PointDynamics(
walls=walls, resize_factor=int(resize_factor))
task_distribution = point_env.PointTaskDistribution(dynamics)
elif env_name == "quadruped-run":
dynamics = dm_env.QuadrupedRunDynamics()
task_distribution = dm_env.QuadrupedRunTaskDistribution(dynamics)
elif env_name == "quadruped":
dynamics = dm_env.QuadrupedRunDynamics()
task_distribution = dm_env.QuadrupedContinuousTaskDistribution(dynamics)
elif env_name == "hopper":
dynamics = dm_env.HopperDynamics()
task_distribution = dm_env.HopperTaskDistribution(dynamics)
elif env_name == "hopper-discrete":
dynamics = dm_env.HopperDynamics()
task_distribution = dm_env.HopperDiscreteTaskDistribution(dynamics)
elif env_name == "walker":
dynamics = dm_env.WalkerDynamics()
task_distribution = dm_env.WalkerTaskDistribution(dynamics)
elif env_name == "humanoid":
dynamics = dm_env.HumanoidDynamics()
task_distribution = dm_env.HumanoidTaskDistribution(dynamics)
### sparse tasks
elif env_name == "finger":
dynamics = dm_env.FingerDynamics()
task_distribution = dm_env.FingerTaskDistribution(
dynamics, use_neg_rew=use_neg_rew, margin=margin)
elif env_name == "manipulator":
dynamics = dm_env.ManipulatorDynamics()
task_distribution = dm_env.ManipulatorTaskDistribution(dynamics)
elif env_name == "point-mass":
dynamics = dm_env.PointMassDynamics()
task_distribution = dm_env.PointMassTaskDistribution(
dynamics, use_neg_rew=use_neg_rew, margin=margin)
elif env_name == "stacker":
dynamics = dm_env.StackerDynamics()
task_distribution = dm_env.FingerStackerDistribution(
dynamics, use_neg_rew=use_neg_rew, margin=margin)
elif env_name == "swimmer":
dynamics = dm_env.SwimmerDynamics()
task_distribution = dm_env.SwimmerTaskDistribution(dynamics)
elif env_name == "fish":
dynamics = dm_env.FishDynamics()
task_distribution = dm_env.FishTaskDistribution(dynamics)
elif env_name == "sawyer-reach":
dynamics = sawyer_env.SawyerDynamics()
task_distribution = sawyer_env.SawyerReachTaskDistribution(dynamics)
else:
raise NotImplementedError("Unknown environment: %s" % env_name)
gym_env = multitask.Environment(
dynamics, task_distribution, constant_task=constant_task)
if max_episode_steps is not None:
# Add a placeholder spec so the TimeLimit wrapper works.
gym_env.spec = registration.EnvSpec("env-v0")
gym_env = TimeLimit(gym_env, max_episode_steps)
wrapped_env = gym_wrapper.GymWrapper(gym_env, discount=1.0, auto_reset=True)
return wrapped_env, task_distribution
def main(_):
tf.config.experimental_run_functions_eagerly(FLAGS.eager)
gym_env, dataset = d4rl_utils.create_d4rl_env_and_dataset(
task_name=FLAGS.task_name, batch_size=FLAGS.batch_size)
env = gym_wrapper.GymWrapper(gym_env)
env = tf_py_environment.TFPyEnvironment(env)
dataset_iter = iter(dataset)
tf.random.set_seed(FLAGS.seed)
hparam_str = utils.make_hparam_string(FLAGS.xm_parameters,
algo_name=FLAGS.algo_name,
seed=FLAGS.seed,
task_name=FLAGS.task_name,
data_name=FLAGS.data_name)
summary_writer = tf.summary.create_file_writer(
os.path.join(FLAGS.save_dir, 'tb', hparam_str))
result_writer = tf.summary.create_file_writer(
os.path.join(FLAGS.save_dir, 'results', hparam_str))
if FLAGS.algo_name == 'bc':
model = behavioral_cloning.BehavioralCloning(env.observation_spec(),
env.action_spec())
elif FLAGS.algo_name == 'bc_mix':
model = behavioral_cloning.BehavioralCloning(env.observation_spec(),
env.action_spec(),
mixture=True)
elif 'ddpg' in FLAGS.algo_name:
model = ddpg.DDPG(env.observation_spec(), env.action_spec())
elif 'crr' in FLAGS.algo_name:
model = awr.AWR(env.observation_spec(), env.action_spec(), f='bin_max')
elif 'awr' in FLAGS.algo_name:
model = awr.AWR(env.observation_spec(),
env.action_spec(),
f='exp_mean')
elif 'bcq' in FLAGS.algo_name:
model = bcq.BCQ(env.observation_spec(), env.action_spec())
elif 'asac' in FLAGS.algo_name:
model = asac.ASAC(env.observation_spec(),
env.action_spec(),
target_entropy=-env.action_spec().shape[0])
elif 'sac' in FLAGS.algo_name:
model = sac.SAC(env.observation_spec(),
env.action_spec(),
target_entropy=-env.action_spec().shape[0])
elif 'cql' in FLAGS.algo_name:
model = cql.CQL(env.observation_spec(),
env.action_spec(),
target_entropy=-env.action_spec().shape[0])
elif 'brac' in FLAGS.algo_name:
if 'fbrac' in FLAGS.algo_name:
model = fisher_brac.FBRAC(
env.observation_spec(),
env.action_spec(),
target_entropy=-env.action_spec().shape[0],
f_reg=FLAGS.f_reg,
reward_bonus=FLAGS.reward_bonus)
else:
model = brac.BRAC(env.observation_spec(),
env.action_spec(),
target_entropy=-env.action_spec().shape[0])
model_folder = os.path.join(
FLAGS.save_dir, 'models',
f'{FLAGS.task_name}_{FLAGS.data_name}_{FLAGS.seed}')
if not tf.gfile.io.isdir(model_folder):
bc_pretraining_steps = 1_000_000
for i in tqdm.tqdm(range(bc_pretraining_steps)):
info_dict = model.bc.update_step(dataset_iter)
if i % FLAGS.log_interval == 0:
with summary_writer.as_default():
for k, v in info_dict.items():
tf.summary.scalar(f'training/{k}',
v,
step=i - bc_pretraining_steps)
# model.bc.policy.save_weights(os.path.join(model_folder, 'model'))
else:
model.bc.policy.load_weights(os.path.join(model_folder, 'model'))
for i in tqdm.tqdm(range(FLAGS.num_updates)):
with summary_writer.as_default():
info_dict = model.update_step(dataset_iter)
if i % FLAGS.log_interval == 0:
with summary_writer.as_default():
for k, v in info_dict.items():
tf.summary.scalar(f'training/{k}', v, step=i)
if (i + 1) % FLAGS.eval_interval == 0:
average_returns, average_length = evaluation.evaluate(env, model)
if FLAGS.data_name is None:
average_returns = gym_env.get_normalized_score(
average_returns) * 100.0
with result_writer.as_default():
tf.summary.scalar('evaluation/returns',
average_returns,
step=i + 1)
tf.summary.scalar('evaluation/length',
average_length,
step=i + 1)
def get_env_and_policy(load_dir,
env_name,
alpha,
env_seed=0,
tabular_obs=False):
if env_name == 'taxi':
env = taxi.Taxi(tabular_obs=tabular_obs)
env.seed(env_seed)
policy_fn, policy_info_spec = taxi.get_taxi_policy(load_dir,
env,
alpha=alpha,
py=False)
tf_env = tf_py_environment.TFPyEnvironment(gym_wrapper.GymWrapper(env))
policy = common_lib.TFAgentsWrappedPolicy(tf_env.time_step_spec(),
tf_env.action_spec(),
policy_fn,
policy_info_spec,
emit_log_probability=True)
elif env_name == 'grid':
env = navigation.GridWalk(tabular_obs=tabular_obs)
env.seed(env_seed)
policy_fn, policy_info_spec = navigation.get_navigation_policy(
env, epsilon_explore=0.1 + 0.6 * (1 - alpha), py=False)
tf_env = tf_py_environment.TFPyEnvironment(gym_wrapper.GymWrapper(env))
policy = common_lib.TFAgentsWrappedPolicy(tf_env.time_step_spec(),
tf_env.action_spec(),
policy_fn,
policy_info_spec,
emit_log_probability=True)
elif env_name == 'low_rank':
env = low_rank.LowRank()
env.seed(env_seed)
policy_fn, policy_info_spec = low_rank.get_low_rank_policy(
env, epsilon_explore=0.1 + 0.8 * (1 - alpha), py=False)
tf_env = tf_py_environment.TFPyEnvironment(gym_wrapper.GymWrapper(env))
policy = common_lib.TFAgentsWrappedPolicy(tf_env.time_step_spec(),
tf_env.action_spec(),
policy_fn,
policy_info_spec,
emit_log_probability=True)
elif env_name == 'tree':
env = tree.Tree(branching=2, depth=10)
env.seed(env_seed)
policy_fn, policy_info_spec = tree.get_tree_policy(
env, epsilon_explore=0.1 + 0.8 * (1 - alpha), py=False)
tf_env = tf_py_environment.TFPyEnvironment(gym_wrapper.GymWrapper(env))
policy = common_lib.TFAgentsWrappedPolicy(tf_env.time_step_spec(),
tf_env.action_spec(),
policy_fn,
policy_info_spec,
emit_log_probability=True)
elif env_name == 'lowrank_tree':
env = tree.Tree(branching=2, depth=3, duplicate=10)
env.seed(env_seed)
policy_fn, policy_info_spec = tree.get_tree_policy(
env, epsilon_explore=0.1 + 0.8 * (1 - alpha), py=False)
tf_env = tf_py_environment.TFPyEnvironment(gym_wrapper.GymWrapper(env))
policy = common_lib.TFAgentsWrappedPolicy(tf_env.time_step_spec(),
tf_env.action_spec(),
policy_fn,
policy_info_spec,
emit_log_probability=True)
elif env_name.startswith('bandit'):
num_arms = int(env_name[6:]) if len(env_name) > 6 else 2
env = bandit.Bandit(num_arms=num_arms)
env.seed(env_seed)
policy_fn, policy_info_spec = bandit.get_bandit_policy(
env, epsilon_explore=1 - alpha, py=False)
tf_env = tf_py_environment.TFPyEnvironment(gym_wrapper.GymWrapper(env))
policy = common_lib.TFAgentsWrappedPolicy(tf_env.time_step_spec(),
tf_env.action_spec(),
policy_fn,
policy_info_spec,
emit_log_probability=True)
elif env_name == 'small_tree':
env = tree.Tree(branching=2, depth=3, loop=True)
env.seed(env_seed)
policy_fn, policy_info_spec = tree.get_tree_policy(
env, epsilon_explore=0.1 + 0.8 * (1 - alpha), py=False)
tf_env = tf_py_environment.TFPyEnvironment(gym_wrapper.GymWrapper(env))
policy = common_lib.TFAgentsWrappedPolicy(tf_env.time_step_spec(),
tf_env.action_spec(),
policy_fn,
policy_info_spec,
emit_log_probability=True)
elif env_name == 'CartPole-v0':
tf_env, policy = get_env_and_dqn_policy(
env_name,
os.path.join(load_dir, 'CartPole-v0', 'train', 'policy'),
env_seed=env_seed,
epsilon=0.3 + 0.15 * (1 - alpha))
elif env_name == 'cartpole': # Infinite-horizon cartpole.
tf_env, policy = get_env_and_dqn_policy(
'CartPole-v0',
os.path.join(load_dir, 'CartPole-v0-250', 'train', 'policy'),
env_seed=env_seed,
epsilon=0.3 + 0.15 * (1 - alpha))
env = InfiniteCartPole()
tf_env = tf_py_environment.TFPyEnvironment(gym_wrapper.GymWrapper(env))
elif env_name == 'FrozenLake-v0':
tf_env, policy = get_env_and_dqn_policy('FrozenLake-v0',
os.path.join(
load_dir, 'FrozenLake-v0',
'train', 'policy'),
env_seed=env_seed,
epsilon=0.2 * (1 - alpha),
ckpt_file='ckpt-100000')
elif env_name == 'frozenlake': # Infinite-horizon frozenlake.
tf_env, policy = get_env_and_dqn_policy('FrozenLake-v0',
os.path.join(
load_dir, 'FrozenLake-v0',
'train', 'policy'),
env_seed=env_seed,
epsilon=0.2 * (1 - alpha),
ckpt_file='ckpt-100000')
env = InfiniteFrozenLake()
tf_env = tf_py_environment.TFPyEnvironment(gym_wrapper.GymWrapper(env))
elif env_name in ['Reacher-v2', 'reacher']:
if env_name == 'Reacher-v2':
env = suites.load_mujoco(env_name)
else:
env = gym_wrapper.GymWrapper(InfiniteReacher())
env.seed(env_seed)
tf_env = tf_py_environment.TFPyEnvironment(env)
sac_policy = get_sac_policy(tf_env)
directory = os.path.join(load_dir, 'Reacher-v2', 'train', 'policy')
policy = load_policy(sac_policy, env_name, directory)
policy = GaussianPolicy(policy,
0.4 - 0.3 * alpha,
emit_log_probability=True)
elif env_name == 'HalfCheetah-v2':
env = suites.load_mujoco(env_name)
env.seed(env_seed)
tf_env = tf_py_environment.TFPyEnvironment(env)
sac_policy = get_sac_policy(tf_env)
directory = os.path.join(load_dir, env_name, 'train', 'policy')
policy = load_policy(sac_policy, env_name, directory)
policy = GaussianPolicy(policy,
0.2 - 0.1 * alpha,
emit_log_probability=True)
else:
raise ValueError('Unrecognized environment %s.' % env_name)
return tf_env, policy
def load_carla_env(env_name='carla-v0',
discount=1.0,
number_of_vehicles=100,
number_of_walkers=0,
display_size=256,
max_past_step=1,
dt=0.1,
discrete=False,
discrete_acc=[-3.0, 0.0, 3.0],
discrete_steer=[-0.2, 0.0, 0.2],
continuous_accel_range=[-3.0, 3.0],
continuous_steer_range=[-0.3, 0.3],
ego_vehicle_filter='vehicle.lincoln*',
port=2000,
town='Town03',
task_mode='random',
max_time_episode=500,
max_waypt=12,
obs_range=32,
lidar_bin=0.5,
d_behind=12,
out_lane_thres=2.0,
desired_speed=8,
max_ego_spawn_times=200,
display_route=True,
pixor_size=64,
pixor=False,
obs_channels=None,
action_repeat=1):
"""Loads train and eval environments."""
env_params = {
'number_of_vehicles': number_of_vehicles,
'number_of_walkers': number_of_walkers,
'display_size': display_size, # screen size of bird-eye render
'max_past_step': max_past_step, # the number of past steps to draw
'dt': dt, # time interval between two frames
'discrete': discrete, # whether to use discrete control space
'discrete_acc': discrete_acc, # discrete value of accelerations
'discrete_steer': discrete_steer, # discrete value of steering angles
'continuous_accel_range':
continuous_accel_range, # continuous acceleration range
'continuous_steer_range':
continuous_steer_range, # continuous steering angle range
'ego_vehicle_filter':
ego_vehicle_filter, # filter for defining ego vehicle
'port': port, # connection port
'town': town, # which town to simulate
'task_mode':
task_mode, # mode of the task, [random, roundabout (only for Town03)]
'max_time_episode': max_time_episode, # maximum timesteps per episode
'max_waypt': max_waypt, # maximum number of waypoints
'obs_range': obs_range, # observation range (meter)
'lidar_bin': lidar_bin, # bin size of lidar sensor (meter)
'd_behind': d_behind, # distance behind the ego vehicle (meter)
'out_lane_thres': out_lane_thres, # threshold for out of lane
'desired_speed': desired_speed, # desired speed (m/s)
'max_ego_spawn_times':
max_ego_spawn_times, # maximum times to spawn ego vehicle
'display_route': display_route, # whether to render the desired route
'pixor_size': pixor_size, # size of the pixor labels
'pixor': pixor, # whether to output PIXOR observation
}
gym_spec = gym.spec(env_name)
gym_env = gym_spec.make(params=env_params)
if obs_channels:
gym_env = filter_observation_wrapper.FilterObservationWrapper(
gym_env, obs_channels)
py_env = gym_wrapper.GymWrapper(
gym_env,
discount=discount,
auto_reset=True,
)
eval_py_env = py_env
if action_repeat > 1:
py_env = wrappers.ActionRepeat(py_env, action_repeat)
return py_env, eval_py_env
def env_load_fn(environment_name='DrunkSpiderShort',
max_episode_steps=50,
resize_factor=(1, 1),
terminate_on_timeout=True,
start=(0, 3),
goal=(7, 3),
goal_bounds=[(6, 2), (7, 4)],
fall_penalty=0.,
reset_on_fall=False,
gym_env_wrappers=[],
gym=False):
"""Loads the selected environment and wraps it with the specified wrappers.
Args:
environment_name: Name for the environment to load.
max_episode_steps: If None the max_episode_steps will be set to the default
step limit defined in the environment's spec. No limit is applied if set
to 0 or if there is no timestep_limit set in the environment's spec.
resize_factor: A factor for resizing.
terminate_on_timeout: Whether to set done = True when the max episode steps
is reached.
Returns:
A PyEnvironmentBase instance.
"""
if resize_factor != (1, 1):
if start:
start = (start[0] * resize_factor[0], start[1] * resize_factor[1])
if goal:
goal = (goal[0] * resize_factor[0], goal[1] * resize_factor[1])
if goal_bounds:
goal_bounds = [(g[0] * resize_factor[0], g[1] * resize_factor[1])
for g in goal_bounds]
if 'acnoise' in environment_name.split('-'):
environment_name = environment_name.split('-')[0]
gym_env = PointMassAcNoiseEnv(start=start,
env_name=environment_name,
resize_factor=resize_factor)
elif 'acscale' in environment_name.split('-'):
environment_name = environment_name.split('-')[0]
gym_env = PointMassAcScaleEnv(start=start,
env_name=environment_name,
resize_factor=resize_factor)
else:
gym_env = PointMassEnv(start=start,
env_name=environment_name,
resize_factor=resize_factor)
gym_env = GoalConditionedPointWrapper(gym_env,
goal=goal,
goal_bounds=goal_bounds,
fall_penalty=-abs(fall_penalty),
reset_on_fall=reset_on_fall,
max_episode_steps=max_episode_steps)
for wrapper in gym_env_wrappers:
gym_env = wrapper(gym_env)
if gym:
return gym_env
from tf_agents.environments import gym_wrapper
env = gym_wrapper.GymWrapper(gym_env,
discount=1.0,
auto_reset=True,
simplify_box_bounds=False)
if max_episode_steps > 0:
if terminate_on_timeout:
env = TimeLimitBonus(env, max_episode_steps)
else:
env = NonTerminatingTimeLimit(env, max_episode_steps)
return env
def main(_):
tf.config.experimental_run_functions_eagerly(FLAGS.eager)
gym_env, dataset = d4rl_utils.create_d4rl_env_and_dataset(
task_name=FLAGS.task_name, batch_size=FLAGS.batch_size)
env = gym_wrapper.GymWrapper(gym_env)
env = tf_py_environment.TFPyEnvironment(env)
dataset_iter = iter(dataset)
tf.random.set_seed(FLAGS.seed)
hparam_str = f'{FLAGS.algo_name}_{FLAGS.task_name}_seed={FLAGS.seed}'
summary_writer = tf.summary.create_file_writer(
os.path.join(FLAGS.save_dir, 'tb', hparam_str))
result_writer = tf.summary.create_file_writer(
os.path.join(FLAGS.save_dir, 'results', hparam_str))
if FLAGS.algo_name == 'bc':
model = behavioral_cloning.BehavioralCloning(env.observation_spec(),
env.action_spec())
else:
model = fisher_brc.FBRC(env.observation_spec(),
env.action_spec(),
target_entropy=-env.action_spec().shape[0],
f_reg=FLAGS.f_reg,
reward_bonus=FLAGS.reward_bonus)
for i in tqdm.tqdm(range(FLAGS.bc_pretraining_steps)):
info_dict = model.bc.update_step(dataset_iter)
if i % FLAGS.log_interval == 0:
with summary_writer.as_default():
for k, v in info_dict.items():
tf.summary.scalar(f'training/{k}',
v,
step=i - FLAGS.bc_pretraining_steps)
for i in tqdm.tqdm(range(FLAGS.num_updates)):
with summary_writer.as_default():
info_dict = model.update_step(dataset_iter)
if i % FLAGS.log_interval == 0:
with summary_writer.as_default():
for k, v in info_dict.items():
tf.summary.scalar(f'training/{k}', v, step=i)
if (i + 1) % FLAGS.eval_interval == 0:
average_returns, average_length = evaluation.evaluate(env, model)
average_returns = gym_env.get_normalized_score(
average_returns) * 100.0
with result_writer.as_default():
tf.summary.scalar('evaluation/returns',
average_returns,
step=i + 1)
tf.summary.scalar('evaluation/length',
average_length,
step=i + 1)
window_size = 10
num_eval_episodes = 30
network_shape = (128, 128,)
learning_rate = 1e-3
tau = 0.1
gradient_clipping = 1
policy_dir = 'policy'
train_py_env = gym_wrapper.GymWrapper(StockTradingEnv(df=train_data, window_size=window_size))
eval_py_env = gym_wrapper.GymWrapper(StockTradingEnv(df=eval_data, window_size=window_size, eval=True))
train_env = tf_py_environment.TFPyEnvironment(train_py_env)
eval_env = tf_py_environment.TFPyEnvironment(eval_py_env)
def eval_policy(policy, render=False):
total_reward = 0
for _ in range(num_eval_episodes):
time_step = eval_env.reset()
episode_reward = 0
while not time_step.is_last():
time_step = eval_env.step(policy.action(time_step).action)
episode_reward += time_step.reward
def main(_):
tf.config.experimental_run_functions_eagerly(FLAGS.eager)
def preprocess_fn(dataset):
return dataset.cache().shuffle(1_000_000, reshuffle_each_iteration=True)
def state_mask_fn(states):
if FLAGS.state_mask_dims == 0:
return states
assert FLAGS.state_mask_dims <= states.shape[1]
state_mask_dims = (
states.shape[1]
if FLAGS.state_mask_dims == -1 else FLAGS.state_mask_dims)
if FLAGS.state_mask_index == 'fixed':
mask_indices = range(states.shape[1] - state_mask_dims, states.shape[1])
else:
mask_indices = np.random.permutation(np.arange(
states.shape[1]))[:state_mask_dims]
if FLAGS.state_mask_value == 'gaussian':
mask_values = states[:, mask_indices]
mask_values = (
mask_values + np.std(mask_values, axis=0) *
np.random.normal(size=mask_values.shape))
elif 'quantize' in FLAGS.state_mask_value:
mask_values = states[:, mask_indices]
mask_values = np.around(
mask_values, decimals=int(FLAGS.state_mask_value[-1]))
else:
mask_values = 0
states[:, mask_indices] = mask_values
return states
gym_env, dataset, embed_dataset = d4rl_utils.create_d4rl_env_and_dataset(
task_name=FLAGS.task_name,
batch_size=FLAGS.batch_size,
sliding_window=FLAGS.embed_training_window,
state_mask_fn=state_mask_fn)
downstream_embed_dataset = None
if (FLAGS.downstream_task_name is not None or
FLAGS.downstream_data_name is not None or
FLAGS.downstream_data_size is not None):
downstream_data_name = FLAGS.downstream_data_name
assert downstream_data_name is None
gym_env, dataset, downstream_embed_dataset = d4rl_utils.create_d4rl_env_and_dataset(
task_name=FLAGS.downstream_task_name,
batch_size=FLAGS.batch_size,
sliding_window=FLAGS.embed_training_window,
data_size=FLAGS.downstream_data_size,
state_mask_fn=state_mask_fn)
if FLAGS.proportion_downstream_data:
zipped_dataset = tf.data.Dataset.zip((embed_dataset, downstream_embed_dataset))
def combine(*elems1_and_2):
batch_size = tf.shape(elems1_and_2[0][0])[0]
which = tf.random.uniform([batch_size]) >= FLAGS.proportion_downstream_data
from1 = tf.where(which)
from2 = tf.where(tf.logical_not(which))
new_elems = map(
lambda x: tf.concat([tf.gather_nd(x[0], from1), tf.gather_nd(x[1], from2)], 0),
zip(*elems1_and_2))
return tuple(new_elems)
embed_dataset = zipped_dataset.map(combine)
if FLAGS.embed_learner and 'action' in FLAGS.embed_learner:
assert FLAGS.embed_training_window >= 2
dataset = downstream_embed_dataset or embed_dataset
if FLAGS.downstream_mode == 'online':
downstream_task = FLAGS.downstream_task_name or FLAGS.task_name
try:
train_gym_env = gym.make(downstream_task)
except:
train_gym_env = gym.make('DM-' + downstream_task)
train_env = gym_wrapper.GymWrapper(train_gym_env)
train_env = tf_py_environment.TFPyEnvironment(train_env)
replay_spec = (
train_env.observation_spec(),
train_env.action_spec(),
train_env.reward_spec(),
train_env.reward_spec(), # discount spec
train_env.observation_spec(), # next observation spec
)
replay_buffer = tf_uniform_replay_buffer.TFUniformReplayBuffer(
replay_spec,
batch_size=1,
max_length=FLAGS.num_updates,
dataset_window_shift=1 if get_ctx_length() else None)
@tf.function
def add_to_replay(state, action, reward, discount, next_states,
replay_buffer=replay_buffer):
replay_buffer.add_batch((state, action, reward, discount, next_states))
initial_collect_policy = random_tf_policy.RandomTFPolicy(
train_env.time_step_spec(), train_env.action_spec())
dataset = replay_buffer.as_dataset(
num_parallel_calls=3,
sample_batch_size=FLAGS.batch_size,
num_steps=FLAGS.embed_training_window
if get_ctx_length() else None).prefetch(3)
dataset = dataset.map(lambda *data: data[0])
else:
train_env = None
replay_buffer = None
add_to_replay = None
initial_collect_policy = None
env = gym_wrapper.GymWrapper(gym_env)
env = tf_py_environment.TFPyEnvironment(env)
dataset_iter = iter(dataset)
embed_dataset_iter = iter(embed_dataset) if embed_dataset else None
tf.random.set_seed(FLAGS.seed)
summary_writer = tf.summary.create_file_writer(
os.path.join(FLAGS.save_dir, 'tb'))
result_writer = tf.summary.create_file_writer(
os.path.join(FLAGS.save_dir, 'results'))
if (FLAGS.state_embed_dim or FLAGS.state_action_embed_dim
) and FLAGS.embed_learner and FLAGS.embed_pretraining_steps != 0:
embed_model = get_embed_model(env)
if FLAGS.finetune:
other_embed_model = get_embed_model(env)
other_embed_model2 = get_embed_model(env)
else:
other_embed_model = None
other_embed_model2 = None
else:
embed_model = None
other_embed_model = None
other_embed_model2 = None
config_str = f'{FLAGS.task_name}_{FLAGS.embed_learner}_{FLAGS.state_embed_dim}_{FLAGS.state_embed_dists}_{FLAGS.embed_training_window}_{FLAGS.downstream_input_mode}_{FLAGS.finetune}_{FLAGS.network}_{FLAGS.seed}'
if FLAGS.embed_learner == 'acl':
config_str += f'_{FLAGS.predict_actions}_{FLAGS.policy_decoder_on_embeddings}_{FLAGS.reward_decoder_on_embeddings}_{FLAGS.predict_rewards}_{FLAGS.embed_on_input}_{FLAGS.extra_embedder}_{FLAGS.positional_encoding_type}_{FLAGS.direction}'
elif FLAGS.embed_learner and 'action' in FLAGS.embed_learner:
config_str += f'_{FLAGS.state_action_embed_dim}_{FLAGS.state_action_fourier_dim}'
save_dir = os.path.join(FLAGS.save_dir, config_str)
# Embed pretraining
if FLAGS.embed_pretraining_steps > 0 and embed_model is not None:
model_folder = os.path.join(
save_dir, 'embed_models%d' % FLAGS.embed_pretraining_steps,
config_str)
if not tf.io.gfile.isdir(model_folder):
embed_pretraining_steps = FLAGS.embed_pretraining_steps
for i in tqdm.tqdm(range(embed_pretraining_steps)):
embed_dict = embed_model.update_step(embed_dataset_iter)
if i % FLAGS.log_interval == 0:
with summary_writer.as_default():
for k, v in embed_dict.items():
tf.summary.scalar(f'embed/{k}', v, step=i-embed_pretraining_steps)
print(k, v)
print('embed pretraining')
embed_model.save_weights(os.path.join(model_folder, 'embed'))
else:
time.sleep(np.random.randint(5, 20)) # Try to suppress checksum errors.
embed_model.load_weights(os.path.join(model_folder, 'embed'))
if other_embed_model and other_embed_model2:
try: # Try to suppress checksum errors.
other_embed_model.load_weights(os.path.join(model_folder, 'embed'))
other_embed_model2.load_weights(os.path.join(model_folder, 'embed'))
except:
embed_model.save_weights(os.path.join(model_folder, 'embed'))
other_embed_model.load_weights(os.path.join(model_folder, 'embed'))
other_embed_model2.load_weights(os.path.join(model_folder, 'embed'))
if FLAGS.algo_name == 'bc':
hidden_dims = ([] if FLAGS.network == 'none' else
(256,) if FLAGS.network == 'small' else
(256, 256))
model = behavioral_cloning.BehavioralCloning(
env.observation_spec().shape[0],
env.action_spec(),
hidden_dims=hidden_dims,
embed_model=embed_model,
finetune=FLAGS.finetune)
elif FLAGS.algo_name == 'latent_bc':
hidden_dims = ([] if FLAGS.network == 'none' else
(256,) if FLAGS.network == 'small' else (256, 256))
model = latent_behavioral_cloning.LatentBehavioralCloning(
env.observation_spec().shape[0],
env.action_spec(),
hidden_dims=hidden_dims,
embed_model=embed_model,
finetune=FLAGS.finetune,
finetune_primitive=FLAGS.finetune_primitive,
learning_rate=FLAGS.latent_bc_lr,
latent_bc_lr_decay=FLAGS.latent_bc_lr_decay,
kl_regularizer=FLAGS.kl_regularizer)
elif 'sac' in FLAGS.algo_name:
model = sac.SAC(
env.observation_spec().shape[0],
env.action_spec(),
target_entropy=-env.action_spec().shape[0],
embed_model=embed_model,
other_embed_model=other_embed_model,
network=FLAGS.network,
finetune=FLAGS.finetune)
elif 'brac' in FLAGS.algo_name:
model = brac.BRAC(
env.observation_spec().shape[0],
env.action_spec(),
target_entropy=-env.action_spec().shape[0],
embed_model=embed_model,
other_embed_model=other_embed_model,
bc_embed_model=other_embed_model2,
network=FLAGS.network,
finetune=FLAGS.finetune)
# Agent pretraining.
if not tf.io.gfile.isdir(os.path.join(save_dir, 'model')):
bc_pretraining_steps = 200_000
for i in tqdm.tqdm(range(bc_pretraining_steps)):
if get_ctx_length():
info_dict = model.bc.update_step(embed_dataset_iter)
else:
info_dict = model.bc.update_step(dataset_iter)
if i % FLAGS.log_interval == 0:
with summary_writer.as_default():
for k, v in info_dict.items():
tf.summary.scalar(
f'training/{k}', v, step=i - bc_pretraining_steps)
print('bc pretraining')
model.bc.policy.save_weights(os.path.join(save_dir, 'model'))
else:
model.bc.policy.load_weights(os.path.join(save_dir, 'model'))
if train_env:
timestep = train_env.reset()
else:
timestep = None
actor = None
if hasattr(model, 'actor'):
actor = model.actor
elif hasattr(model, 'policy'):
actor = model.policy
ctx_states = []
ctx_actions = []
ctx_rewards = []
for i in tqdm.tqdm(range(FLAGS.num_updates)):
if (train_env and timestep and
replay_buffer and initial_collect_policy and
add_to_replay and actor):
if timestep.is_last():
timestep = train_env.reset()
if replay_buffer.num_frames() < FLAGS.num_random_actions:
policy_step = initial_collect_policy.action(timestep)
action = policy_step.action
ctx_states.append(state_mask_fn(timestep.observation.numpy()))
ctx_actions.append(action)
ctx_rewards.append(timestep.reward)
else:
states = state_mask_fn(timestep.observation.numpy())
actions = None
rewards = None
if get_ctx_length():
ctx_states.append(states)
states = tf.stack(ctx_states[-get_ctx_length():], axis=1)
actions = tf.stack(ctx_actions[-get_ctx_length() + 1:], axis=1)
rewards = tf.stack(ctx_rewards[-get_ctx_length() + 1:], axis=1)
if hasattr(model, 'embed_model') and model.embed_model:
states = model.embed_model(states, actions, rewards)
action = actor(states, sample=True)
ctx_actions.append(action)
next_timestep = train_env.step(action)
ctx_rewards.append(next_timestep.reward)
add_to_replay(
state_mask_fn(timestep.observation.numpy()), action,
next_timestep.reward, next_timestep.discount,
state_mask_fn(next_timestep.observation.numpy()))
timestep = next_timestep
with summary_writer.as_default():
if embed_model and FLAGS.embed_pretraining_steps == -1:
embed_dict = embed_model.update_step(embed_dataset_iter)
if other_embed_model:
other_embed_dict = other_embed_model.update_step(embed_dataset_iter)
embed_dict.update(dict(('other_%s' % k, v) for k, v in other_embed_dict.items()))
else:
embed_dict = {}
if FLAGS.downstream_mode == 'offline':
if get_ctx_length():
info_dict = model.update_step(embed_dataset_iter)
else:
info_dict = model.update_step(dataset_iter)
elif i + 1 >= FLAGS.num_random_actions:
info_dict = model.update_step(dataset_iter)
else:
info_dict = {}
if i % FLAGS.log_interval == 0:
with summary_writer.as_default():
for k, v in info_dict.items():
tf.summary.scalar(f'training/{k}', v, step=i)
for k, v in embed_dict.items():
tf.summary.scalar(f'embed/{k}', v, step=i)
print(k, v)
if (i + 1) % FLAGS.eval_interval == 0:
average_returns, average_length = evaluation.evaluate(
env,
model,
ctx_length=get_ctx_length(),
embed_training_window=(FLAGS.embed_training_window
if FLAGS.embed_learner and
'action' in FLAGS.embed_learner else None),
state_mask_fn=state_mask_fn if FLAGS.state_mask_eval else None)
average_returns = gym_env.get_normalized_score(average_returns) * 100.0
with result_writer.as_default():
tf.summary.scalar('evaluation/returns', average_returns, step=i+1)
tf.summary.scalar('evaluation/length', average_length, step=i+1)
print('evaluation/returns', average_returns)
print('evaluation/length', average_length)
def train_eval(
root_dir,
load_root_dir=None,
env_load_fn=None,
gym_env_wrappers=[],
monitor=False,
env_name=None,
agent_class=None,
initial_collect_driver_class=None,
collect_driver_class=None,
online_driver_class=dynamic_episode_driver.DynamicEpisodeDriver,
num_global_steps=1000000,
train_steps_per_iteration=1,
train_metrics=None,
eval_metrics=None,
train_metrics_callback=None,
# Params for SacAgent args
actor_fc_layers=(256, 256),
critic_joint_fc_layers=(256, 256),
# Safety Critic training args
train_sc_steps=10,
train_sc_interval=1000,
online_critic=False,
n_envs=None,
finetune_sc=False,
# Ensemble Critic training args
n_critics=30,
critic_learning_rate=3e-4,
# Wcpg Critic args
critic_preprocessing_layer_size=256,
actor_preprocessing_layer_size=256,
# Params for train
batch_size=256,
# Params for eval
run_eval=False,
num_eval_episodes=1,
max_episode_len=500,
eval_interval=10000,
eval_metrics_callback=None,
# Params for summaries and logging
train_checkpoint_interval=10000,
policy_checkpoint_interval=5000,
rb_checkpoint_interval=50000,
keep_rb_checkpoint=False,
log_interval=1000,
summary_interval=1000,
monitor_interval=1000,
summaries_flush_secs=10,
early_termination_fn=None,
debug_summaries=False,
seed=None,
eager_debug=False,
env_metric_factories=None): # pylint: disable=unused-argument
"""A simple train and eval for SC-SAC."""
n_envs = n_envs or num_eval_episodes
root_dir = os.path.expanduser(root_dir)
train_dir = os.path.join(root_dir, 'train')
train_summary_writer = tf.compat.v2.summary.create_file_writer(
train_dir, flush_millis=summaries_flush_secs * 1000)
train_summary_writer.set_as_default()
train_metrics = train_metrics or []
eval_metrics = eval_metrics or []
sc_metrics = eval_metrics or []
if online_critic:
sc_dir = os.path.join(root_dir, 'sc')
sc_summary_writer = tf.compat.v2.summary.create_file_writer(
sc_dir, flush_millis=summaries_flush_secs * 1000)
sc_metrics = [
tf_metrics.AverageReturnMetric(buffer_size=num_eval_episodes,
batch_size=n_envs,
name='SafeAverageReturn'),
tf_metrics.AverageEpisodeLengthMetric(
buffer_size=num_eval_episodes,
batch_size=n_envs,
name='SafeAverageEpisodeLength')
] + [tf_py_metric.TFPyMetric(m) for m in sc_metrics]
sc_tf_env = tf_py_environment.TFPyEnvironment(
parallel_py_environment.ParallelPyEnvironment([
lambda: env_load_fn(env_name,
gym_env_wrappers=gym_env_wrappers)
] * n_envs))
if seed:
sc_tf_env.seed([seed + i for i in range(n_envs)])
if run_eval:
eval_dir = os.path.join(root_dir, 'eval')
eval_summary_writer = tf.compat.v2.summary.create_file_writer(
eval_dir, flush_millis=summaries_flush_secs * 1000)
eval_metrics = [
tf_metrics.AverageReturnMetric(buffer_size=num_eval_episodes,
batch_size=n_envs),
tf_metrics.AverageEpisodeLengthMetric(
buffer_size=num_eval_episodes, batch_size=n_envs),
] + [tf_py_metric.TFPyMetric(m) for m in eval_metrics]
eval_tf_env = tf_py_environment.TFPyEnvironment(
parallel_py_environment.ParallelPyEnvironment([
lambda: env_load_fn(env_name,
gym_env_wrappers=gym_env_wrappers)
] * n_envs))
if seed:
eval_tf_env.seed([seed + n_envs + i for i in range(n_envs)])
if monitor:
vid_path = os.path.join(root_dir, 'rollouts')
monitor_env_wrapper = misc.monitor_freq(1, vid_path)
monitor_env = gym.make(env_name)
for wrapper in gym_env_wrappers:
monitor_env = wrapper(monitor_env)
monitor_env = monitor_env_wrapper(monitor_env)
# auto_reset must be False to ensure Monitor works correctly
monitor_py_env = gym_wrapper.GymWrapper(monitor_env, auto_reset=False)
global_step = tf.compat.v1.train.get_or_create_global_step()
with tf.compat.v2.summary.record_if(
lambda: tf.math.equal(global_step % summary_interval, 0)):
py_env = env_load_fn(env_name, gym_env_wrappers=gym_env_wrappers)
tf_env = tf_py_environment.TFPyEnvironment(py_env)
if seed:
tf_env.seed(seed + 2 * n_envs + i for i in range(n_envs))
time_step_spec = tf_env.time_step_spec()
observation_spec = time_step_spec.observation
action_spec = tf_env.action_spec()
logging.debug('obs spec: %s', observation_spec)
logging.debug('action spec: %s', action_spec)
if agent_class: #is not wcpg_agent.WcpgAgent:
actor_net = actor_distribution_network.ActorDistributionNetwork(
observation_spec,
action_spec,
fc_layer_params=actor_fc_layers,
continuous_projection_net=agents.normal_projection_net)
critic_net = agents.CriticNetwork(
(observation_spec, action_spec),
joint_fc_layer_params=critic_joint_fc_layers)
else:
alpha_spec = tensor_spec.BoundedTensorSpec(shape=(),
dtype=tf.float32,
minimum=0.,
maximum=1.,
name='alpha')
input_tensor_spec = (observation_spec, action_spec, alpha_spec)
critic_preprocessing_layers = (
tf.keras.layers.Dense(critic_preprocessing_layer_size),
tf.keras.layers.Dense(critic_preprocessing_layer_size),
tf.keras.layers.Lambda(lambda x: x))
critic_net = agents.DistributionalCriticNetwork(
input_tensor_spec,
joint_fc_layer_params=critic_joint_fc_layers)
actor_preprocessing_layers = (
tf.keras.layers.Dense(actor_preprocessing_layer_size),
tf.keras.layers.Dense(actor_preprocessing_layer_size),
tf.keras.layers.Lambda(lambda x: x))
actor_net = agents.WcpgActorNetwork(
input_tensor_spec,
preprocessing_layers=actor_preprocessing_layers)
if agent_class in SAFETY_AGENTS:
safety_critic_net = agents.CriticNetwork(
(observation_spec, action_spec),
joint_fc_layer_params=critic_joint_fc_layers)
tf_agent = agent_class(time_step_spec,
action_spec,
actor_network=actor_net,
critic_network=critic_net,
safety_critic_network=safety_critic_net,
train_step_counter=global_step,
debug_summaries=debug_summaries)
elif agent_class is ensemble_sac_agent.EnsembleSacAgent:
critic_nets, critic_optimizers = [critic_net], [
tf.keras.optimizers.Adam(critic_learning_rate)
]
for _ in range(n_critics - 1):
critic_nets.append(
agents.CriticNetwork(
(observation_spec, action_spec),
joint_fc_layer_params=critic_joint_fc_layers))
critic_optimizers.append(
tf.keras.optimizers.Adam(critic_learning_rate))
tf_agent = agent_class(time_step_spec,
action_spec,
actor_network=actor_net,
critic_network=critic_nets,
critic_optimizers=critic_optimizers,
debug_summaries=debug_summaries)
else: # assume is using SacAgent
logging.debug(critic_net.input_tensor_spec)
tf_agent = agent_class(time_step_spec,
action_spec,
actor_network=actor_net,
critic_network=critic_net,
train_step_counter=global_step,
debug_summaries=debug_summaries)
tf_agent.initialize()
# Make the replay buffer.
collect_data_spec = tf_agent.collect_data_spec
logging.debug('Allocating replay buffer ...')
# Add to replay buffer and other agent specific observers.
replay_buffer = tf_uniform_replay_buffer.TFUniformReplayBuffer(
collect_data_spec, batch_size=1, max_length=1000000)
logging.debug('RB capacity: %i', replay_buffer.capacity)
logging.debug('ReplayBuffer Collect data spec: %s', collect_data_spec)
agent_observers = [replay_buffer.add_batch]
if online_critic:
online_replay_buffer = tf_uniform_replay_buffer.TFUniformReplayBuffer(
collect_data_spec,
batch_size=1,
max_length=max_episode_len * num_eval_episodes)
agent_observers.append(online_replay_buffer.add_batch)
online_rb_ckpt_dir = os.path.join(train_dir,
'online_replay_buffer')
online_rb_checkpointer = common.Checkpointer(
ckpt_dir=online_rb_ckpt_dir,
max_to_keep=1,
replay_buffer=online_replay_buffer)
clear_rb = online_replay_buffer.clear
train_metrics = [
tf_metrics.NumberOfEpisodes(),
tf_metrics.EnvironmentSteps(),
tf_metrics.AverageReturnMetric(buffer_size=num_eval_episodes,
batch_size=tf_env.batch_size),
tf_metrics.AverageEpisodeLengthMetric(
buffer_size=num_eval_episodes, batch_size=tf_env.batch_size),
] + [tf_py_metric.TFPyMetric(m) for m in train_metrics]
if not online_critic:
eval_policy = tf_agent.policy
collect_policy = tf_agent.collect_policy
else:
eval_policy = tf_agent.policy # pylint: disable=protected-access
collect_policy = tf_agent.collect_policy # pylint: disable=protected-access
online_collect_policy = tf_agent._safe_policy
initial_collect_policy = random_tf_policy.RandomTFPolicy(
time_step_spec, action_spec)
train_checkpointer = common.Checkpointer(
ckpt_dir=train_dir,
agent=tf_agent,
global_step=global_step,
metrics=metric_utils.MetricsGroup(train_metrics, 'train_metrics'))
policy_checkpointer = common.Checkpointer(ckpt_dir=os.path.join(
train_dir, 'policy'),
policy=eval_policy,
global_step=global_step)
if agent_class in SAFETY_AGENTS:
safety_critic_checkpointer = common.Checkpointer(
ckpt_dir=sc_dir,
safety_critic=tf_agent._safety_critic_network, # pylint: disable=protected-access
global_step=global_step)
rb_ckpt_dir = os.path.join(train_dir, 'replay_buffer')
rb_checkpointer = common.Checkpointer(ckpt_dir=rb_ckpt_dir,
max_to_keep=1,
replay_buffer=replay_buffer)
if load_root_dir:
load_root_dir = os.path.expanduser(load_root_dir)
load_train_dir = os.path.join(load_root_dir, 'train')
misc.load_pi_ckpt(load_train_dir, tf_agent) # loads tf_agent
if load_root_dir is None:
train_checkpointer.initialize_or_restore()
rb_checkpointer.initialize_or_restore()
if agent_class in SAFETY_AGENTS:
safety_critic_checkpointer.initialize_or_restore()
env_metrics = []
if env_metric_factories:
for env_metric in env_metric_factories:
env_metrics.append(
tf_py_metric.TFPyMetric(env_metric([py_env.gym])))
# TODO: get env factory with parallel py envs
# if run_eval:
# eval_metrics.append(env_metric([env.gym for env in eval_tf_env.pyenv._envs]))
# if online_critic:
# sc_metrics.append(env_metric([env.gym for env in sc_tf_env.pyenv._envs]))
collect_driver = collect_driver_class(tf_env,
collect_policy,
observers=agent_observers +
train_metrics + env_metrics)
if online_critic:
logging.debug('online driver class: %s', online_driver_class)
if online_driver_class is safe_dynamic_episode_driver.SafeDynamicEpisodeDriver:
online_temp_buffer = episodic_replay_buffer.EpisodicReplayBuffer(
collect_data_spec)
online_temp_buffer_stateful = episodic_replay_buffer.StatefulEpisodicReplayBuffer(
online_temp_buffer, num_episodes=num_eval_episodes)
online_driver = safe_dynamic_episode_driver.SafeDynamicEpisodeDriver(
sc_tf_env,
online_collect_policy,
online_temp_buffer,
online_replay_buffer,
observers=[online_temp_buffer_stateful.add_batch] +
sc_metrics,
num_episodes=num_eval_episodes)
else:
online_driver = online_driver_class(
sc_tf_env,
online_collect_policy,
observers=[online_replay_buffer.add_batch] + sc_metrics,
num_episodes=num_eval_episodes)
online_driver.run = common.function(online_driver.run)
if not eager_debug:
config_saver = gin.tf.GinConfigSaverHook(train_dir,
summarize_config=True)
tf.function(config_saver.after_create_session)()
if agent_class is sac_agent.SacAgent:
collect_driver.run = common.function(collect_driver.run)
if eager_debug:
tf.config.experimental_run_functions_eagerly(True)
if not rb_checkpointer.checkpoint_exists:
logging.info('Performing initial collection ...')
initial_collect_driver_class(tf_env,
initial_collect_policy,
observers=agent_observers +
train_metrics + env_metrics).run()
last_id = replay_buffer._get_last_id() # pylint: disable=protected-access
logging.info('Data saved after initial collection: %d steps',
last_id)
if online_critic:
last_id = online_replay_buffer._get_last_id() # pylint: disable=protected-access
logging.debug(
'Data saved in online buffer after initial collection: %d steps',
last_id)
if run_eval:
results = metric_utils.eager_compute(
eval_metrics,
eval_tf_env,
eval_policy,
num_episodes=num_eval_episodes,
train_step=global_step,
summary_writer=eval_summary_writer,
summary_prefix='EvalMetrics',
)
if eval_metrics_callback is not None:
eval_metrics_callback(results, global_step.numpy())
metric_utils.log_metrics(eval_metrics)
time_step = None
policy_state = collect_policy.get_initial_state(tf_env.batch_size)
timed_at_step = global_step.numpy()
time_acc = 0
# Dataset generates trajectories with shape [Bx2x...]
dataset = replay_buffer.as_dataset(num_parallel_calls=3,
sample_batch_size=batch_size,
num_steps=2).prefetch(3)
iterator = iter(dataset)
if online_critic:
online_dataset = online_replay_buffer.as_dataset(
num_parallel_calls=3,
sample_batch_size=batch_size,
num_steps=2).prefetch(3)
online_iterator = iter(online_dataset)
critic_metrics = [
tf.keras.metrics.AUC(name='safety_critic_auc'),
tf.keras.metrics.TruePositives(name='safety_critic_tp'),
tf.keras.metrics.FalsePositives(name='safety_critic_fp'),
tf.keras.metrics.TrueNegatives(name='safety_critic_tn'),
tf.keras.metrics.FalseNegatives(name='safety_critic_fn'),
tf.keras.metrics.BinaryAccuracy(name='safety_critic_acc')
]
@common.function
def critic_train_step():
"""Builds critic training step."""
start_time = time.time()
experience, buf_info = next(online_iterator)
if env_name.split('-')[0] in SAFETY_ENVS:
safe_rew = experience.observation['task_agn_rew'][:, 1]
else:
safe_rew = misc.process_replay_buffer(online_replay_buffer,
as_tensor=True)
safe_rew = tf.gather(safe_rew,
tf.squeeze(buf_info.ids),
axis=1)
ret = tf_agent.train_sc(experience,
safe_rew,
metrics=critic_metrics,
weights=None)
logging.debug('critic train step: {} sec'.format(time.time() -
start_time))
return ret
@common.function
def train_step():
experience, _ = next(iterator)
ret = tf_agent.train(experience)
return ret
if not early_termination_fn:
early_termination_fn = lambda: False
loss_diverged = False
# How many consecutive steps was loss diverged for.
loss_divergence_counter = 0
mean_train_loss = tf.keras.metrics.Mean(name='mean_train_loss')
if online_critic:
logging.debug('starting safety critic pretraining')
safety_eps = tf_agent._safe_policy._safety_threshold
tf_agent._safe_policy._safety_threshold = 0.6
resample_counter = online_collect_policy._resample_counter
mean_resample_ac = tf.keras.metrics.Mean(
name='mean_unsafe_ac_freq')
# don't fine-tune safety critic
if (global_step.numpy() == 0 and load_root_dir is None):
for _ in range(train_sc_steps):
sc_loss, lambda_loss = critic_train_step() # pylint: disable=unused-variable
tf_agent._safe_policy._safety_threshold = safety_eps
logging.debug('starting policy pretraining')
while (global_step.numpy() <= num_global_steps
and not early_termination_fn()):
# Collect and train.
start_time = time.time()
current_step = global_step.numpy()
if online_critic:
mean_resample_ac(resample_counter.result())
resample_counter.reset()
if time_step is None or time_step.is_last():
resample_ac_freq = mean_resample_ac.result()
mean_resample_ac.reset_states()
time_step, policy_state = collect_driver.run(
time_step=time_step,
policy_state=policy_state,
)
logging.debug('policy eval: {} sec'.format(time.time() -
start_time))
train_time = time.time()
for _ in range(train_steps_per_iteration):
train_loss = train_step()
mean_train_loss(train_loss.loss)
if current_step == 0:
logging.debug('train policy: {} sec'.format(time.time() -
train_time))
if online_critic and current_step % train_sc_interval == 0:
batch_time_step = sc_tf_env.reset()
batch_policy_state = online_collect_policy.get_initial_state(
sc_tf_env.batch_size)
online_driver.run(time_step=batch_time_step,
policy_state=batch_policy_state)
for _ in range(train_sc_steps):
sc_loss, lambda_loss = critic_train_step() # pylint: disable=unused-variable
metric_utils.log_metrics(sc_metrics)
with sc_summary_writer.as_default():
for sc_metric in sc_metrics:
sc_metric.tf_summaries(train_step=global_step,
step_metrics=sc_metrics[:2])
tf.compat.v2.summary.scalar(name='resample_ac_freq',
data=resample_ac_freq,
step=global_step)
total_loss = mean_train_loss.result()
mean_train_loss.reset_states()
# Check for exploding losses.
if (math.isnan(total_loss) or math.isinf(total_loss)
or total_loss > MAX_LOSS):
loss_divergence_counter += 1
if loss_divergence_counter > TERMINATE_AFTER_DIVERGED_LOSS_STEPS:
loss_diverged = True
logging.debug(
'Loss diverged, critic_loss: %s, actor_loss: %s, alpha_loss: %s',
train_loss.extra.critic_loss,
train_loss.extra.actor_loss,
train_loss.extra.alpha_loss)
break
else:
loss_divergence_counter = 0
time_acc += time.time() - start_time
if current_step % log_interval == 0:
logging.info('step = %d, loss = %f', global_step.numpy(),
total_loss)
steps_per_sec = (global_step.numpy() -
timed_at_step) / time_acc
logging.info('%.3f steps/sec', steps_per_sec)
tf.compat.v2.summary.scalar(name='global_steps_per_sec',
data=steps_per_sec,
step=global_step)
timed_at_step = global_step.numpy()
time_acc = 0
train_results = []
for train_metric in train_metrics:
if isinstance(train_metric, (metrics.AverageEarlyFailureMetric,
metrics.AverageFallenMetric,
metrics.AverageSuccessMetric)):
# Plot failure as a fn of return
train_metric.tf_summaries(train_step=global_step,
step_metrics=train_metrics[:3])
else:
train_metric.tf_summaries(train_step=global_step,
step_metrics=train_metrics[:2])
train_results.append(
(train_metric.name, train_metric.result().numpy()))
if env_metrics:
for env_metric in env_metrics:
env_metric.tf_summaries(train_step=global_step,
step_metrics=train_metrics[:2])
train_results.append(
(env_metric.name, env_metric.result().numpy()))
if online_critic:
for critic_metric in critic_metrics:
train_results.append(
(critic_metric.name, critic_metric.result().numpy()))
critic_metric.reset_states()
if train_metrics_callback is not None:
train_metrics_callback(collections.OrderedDict(train_results),
global_step.numpy())
global_step_val = global_step.numpy()
if global_step_val % train_checkpoint_interval == 0:
train_checkpointer.save(global_step=global_step_val)
if global_step_val % policy_checkpoint_interval == 0:
policy_checkpointer.save(global_step=global_step_val)
if agent_class in SAFETY_AGENTS:
safety_critic_checkpointer.save(
global_step=global_step_val)
if rb_checkpoint_interval and global_step_val % rb_checkpoint_interval == 0:
if online_critic:
online_rb_checkpointer.save(global_step=global_step_val)
rb_checkpointer.save(global_step=global_step_val)
elif online_critic:
clear_rb()
if run_eval and global_step_val % eval_interval == 0:
results = metric_utils.eager_compute(
eval_metrics,
eval_tf_env,
eval_policy,
num_episodes=num_eval_episodes,
train_step=global_step,
summary_writer=eval_summary_writer,
summary_prefix='EvalMetrics',
)
if eval_metrics_callback is not None:
eval_metrics_callback(results, global_step_val)
metric_utils.log_metrics(eval_metrics)
if monitor and current_step % monitor_interval == 0:
monitor_time_step = monitor_py_env.reset()
monitor_policy_state = eval_policy.get_initial_state(1)
ep_len = 0
monitor_start = time.time()
while not monitor_time_step.is_last():
monitor_action = eval_policy.action(
monitor_time_step, monitor_policy_state)
action, monitor_policy_state = monitor_action.action, monitor_action.state
monitor_time_step = monitor_py_env.step(action)
ep_len += 1
monitor_py_env.reset()
logging.debug(
'saved rollout at timestep {}, rollout length: {}, {} sec'.
format(global_step_val, ep_len,
time.time() - monitor_start))
logging.debug('iteration time: {} sec'.format(time.time() -
start_time))
if not keep_rb_checkpoint:
misc.cleanup_checkpoints(rb_ckpt_dir)
if loss_diverged:
# Raise an error at the very end after the cleanup.
raise ValueError('Loss diverged to {} at step {}, terminating.'.format(
total_loss, global_step.numpy()))
return total_loss
num_eval_episodes = 10 # @param {type:"integer"}
eval_interval = 1000 # @param {type:"integer"}
tempdir = '/content/drive/MyDrive/5242/Project' # @param {type:"string"}
#env_name = 'MountainCar-v0'
#train_py_env = suite_gym.load(env_name)
#eval_py_env = suite_gym.load(env_name)
#train_env = tf_py_environment.TFPyEnvironment(train_py_env)
#eval_env = tf_py_environment.TFPyEnvironment(eval_py_env)
train_py_env = gym_wrapper.GymWrapper(
ChangeRewardMountainCarEnv(),
discount=1,
spec_dtype_map=None,
auto_reset=True,
render_kwargs=None,
)
eval_py_env = gym_wrapper.GymWrapper(
ChangeRewardMountainCarEnv(),
discount=1,
spec_dtype_map=None,
auto_reset=True,
render_kwargs=None,
)
train_py_env = wrappers.TimeLimit(train_py_env, duration=200)
eval_py_env = wrappers.TimeLimit(eval_py_env, duration=200)
train_env = tf_py_environment.TFPyEnvironment(train_py_env)
eval_env = tf_py_environment.TFPyEnvironment(eval_py_env)
time_step = tf_environment.reset()
while not time_step.is_last():
py_environment.render()
action_step = policy.action(time_step)
time_step = tf_environment.step(action_step.action)
py_environment.close()
tf_environment.close()
df = pd.read_csv(data_path)
env = gym_wrapper.GymWrapper(
gym.make(env_name,
df=df,
window_size=window_size,
frame_bound=(window_size, len(df))))
train_env = tf_py_environment.TFPyEnvironment(env)
eval_env = tf_py_environment.TFPyEnvironment(env)
q_net = q_network.QNetwork(train_env.observation_spec(),
train_env.action_spec(),
fc_layer_params=fc_layer_params)
optimizer = tf.compat.v1.train.AdamOptimizer(learning_rate=learning_rate)
global_step = tf.compat.v1.train.get_or_create_global_step()
agent = dqn_agent.DqnAgent(train_env.time_step_spec(),
train_env.action_spec(),
def test_obs_dtype(self):
cartpole_env = gym.spec('CartPole-v1').make()
env = gym_wrapper.GymWrapper(cartpole_env)
time_step = env.reset()
self.assertEqual(env.observation_spec().dtype,
time_step.observation.dtype)
def main(_):
tf.random.set_seed(FLAGS.seed)
np.random.seed(FLAGS.seed)
hparam_str = make_hparam_string(seed=FLAGS.seed, env_name=FLAGS.env_name)
summary_writer = tf.summary.create_file_writer(
os.path.join(FLAGS.save_dir, 'tb', hparam_str))
summary_writer.set_as_default()
if FLAGS.d4rl:
d4rl_env = gym.make(FLAGS.env_name)
gym_spec = gym.spec(FLAGS.env_name)
if gym_spec.max_episode_steps in [0, None]: # Add TimeLimit wrapper.
gym_env = time_limit.TimeLimit(d4rl_env, max_episode_steps=1000)
else:
gym_env = d4rl_env
gym_env.seed(FLAGS.seed)
env = tf_py_environment.TFPyEnvironment(
gym_wrapper.GymWrapper(gym_env))
behavior_dataset = D4rlDataset(
d4rl_env,
normalize_states=FLAGS.normalize_states,
normalize_rewards=FLAGS.normalize_rewards,
noise_scale=FLAGS.noise_scale,
bootstrap=FLAGS.bootstrap)
else:
env = suite_mujoco.load(FLAGS.env_name)
env.seed(FLAGS.seed)
env = tf_py_environment.TFPyEnvironment(env)
data_file_name = os.path.join(
FLAGS.data_dir, FLAGS.env_name, '0',
f'dualdice_{FLAGS.behavior_policy_std}.pckl')
behavior_dataset = Dataset(data_file_name,
FLAGS.num_trajectories,
normalize_states=FLAGS.normalize_states,
normalize_rewards=FLAGS.normalize_rewards,
noise_scale=FLAGS.noise_scale,
bootstrap=FLAGS.bootstrap)
tf_dataset = behavior_dataset.with_uniform_sampling(
FLAGS.sample_batch_size)
tf_dataset_iter = iter(tf_dataset)
if FLAGS.d4rl:
with tf.io.gfile.GFile(FLAGS.d4rl_policy_filename, 'rb') as f:
policy_weights = pickle.load(f)
actor = utils.D4rlActor(env,
policy_weights,
is_dapg='dapg' in FLAGS.d4rl_policy_filename)
else:
actor = Actor(env.observation_spec().shape[0], env.action_spec())
actor.load_weights(behavior_dataset.model_filename)
policy_returns = utils.estimate_monte_carlo_returns(
env, FLAGS.discount, actor, FLAGS.target_policy_std,
FLAGS.num_mc_episodes)
logging.info('Estimated Per-Step Average Returns=%f', policy_returns)
if 'fqe' in FLAGS.algo or 'dr' in FLAGS.algo:
model = QFitter(env.observation_spec().shape[0],
env.action_spec().shape[0], FLAGS.lr,
FLAGS.weight_decay, FLAGS.tau)
elif 'mb' in FLAGS.algo:
model = ModelBased(env.observation_spec().shape[0],
env.action_spec().shape[0],
learning_rate=FLAGS.lr,
weight_decay=FLAGS.weight_decay)
elif 'dual_dice' in FLAGS.algo:
model = DualDICE(env.observation_spec().shape[0],
env.action_spec().shape[0], FLAGS.weight_decay)
if 'iw' in FLAGS.algo or 'dr' in FLAGS.algo:
behavior = BehaviorCloning(env.observation_spec().shape[0],
env.action_spec(), FLAGS.lr,
FLAGS.weight_decay)
@tf.function
def get_target_actions(states):
return actor(tf.cast(behavior_dataset.unnormalize_states(states),
env.observation_spec().dtype),
std=FLAGS.target_policy_std)[1]
@tf.function
def get_target_logprobs(states, actions):
log_probs = actor(tf.cast(behavior_dataset.unnormalize_states(states),
env.observation_spec().dtype),
actions=actions,
std=FLAGS.target_policy_std)[2]
if tf.rank(log_probs) > 1:
log_probs = tf.reduce_sum(log_probs, -1)
return log_probs
min_reward = tf.reduce_min(behavior_dataset.rewards)
max_reward = tf.reduce_max(behavior_dataset.rewards)
min_state = tf.reduce_min(behavior_dataset.states, 0)
max_state = tf.reduce_max(behavior_dataset.states, 0)
@tf.function
def update_step():
(states, actions, next_states, rewards, masks, weights,
_) = next(tf_dataset_iter)
initial_actions = get_target_actions(behavior_dataset.initial_states)
next_actions = get_target_actions(next_states)
if 'fqe' in FLAGS.algo or 'dr' in FLAGS.algo:
model.update(states, actions, next_states, next_actions, rewards,
masks, weights, FLAGS.discount, min_reward,
max_reward)
elif 'mb' in FLAGS.algo:
model.update(states, actions, next_states, rewards, masks, weights)
elif 'dual_dice' in FLAGS.algo:
model.update(behavior_dataset.initial_states, initial_actions,
behavior_dataset.initial_weights, states, actions,
next_states, next_actions, masks, weights,
FLAGS.discount)
if 'iw' in FLAGS.algo or 'dr' in FLAGS.algo:
behavior.update(states, actions, weights)
gc.collect()
for i in tqdm.tqdm(range(FLAGS.num_updates), desc='Running Training'):
update_step()
if i % FLAGS.eval_interval == 0:
if 'fqe' in FLAGS.algo:
pred_returns = model.estimate_returns(
behavior_dataset.initial_states,
behavior_dataset.initial_weights, get_target_actions)
elif 'mb' in FLAGS.algo:
pred_returns = model.estimate_returns(
behavior_dataset.initial_states,
behavior_dataset.initial_weights, get_target_actions,
FLAGS.discount, min_reward, max_reward, min_state,
max_state)
elif FLAGS.algo in ['dual_dice']:
pred_returns, pred_ratio = model.estimate_returns(
iter(tf_dataset))
tf.summary.scalar('train/pred ratio', pred_ratio, step=i)
elif 'iw' in FLAGS.algo or 'dr' in FLAGS.algo:
discount = FLAGS.discount
_, behavior_log_probs = behavior(behavior_dataset.states,
behavior_dataset.actions)
target_log_probs = get_target_logprobs(
behavior_dataset.states, behavior_dataset.actions)
offset = 0.0
rewards = behavior_dataset.rewards
if 'dr' in FLAGS.algo:
# Doubly-robust is effectively the same as importance-weighting but
# transforming rewards at (s,a) to r(s,a) + gamma * V^pi(s') -
# Q^pi(s,a) and adding an offset to each trajectory equal to V^pi(s0).
offset = model.estimate_returns(
behavior_dataset.initial_states,
behavior_dataset.initial_weights, get_target_actions)
q_values = (model(behavior_dataset.states,
behavior_dataset.actions) /
(1 - discount))
n_samples = 10
next_actions = [
get_target_actions(behavior_dataset.next_states)
for _ in range(n_samples)
]
next_q_values = sum([
model(behavior_dataset.next_states, next_action) /
(1 - discount) for next_action in next_actions
]) / n_samples
rewards = rewards + discount * next_q_values - q_values
# Now we compute the self-normalized importance weights.
# Self-normalization happens over trajectories per-step, so we
# restructure the dataset as [num_trajectories, num_steps].
num_trajectories = len(behavior_dataset.initial_states)
max_trajectory_length = np.max(behavior_dataset.steps) + 1
trajectory_weights = behavior_dataset.initial_weights
trajectory_starts = np.where(
np.equal(behavior_dataset.steps, 0))[0]
batched_rewards = np.zeros(
[num_trajectories, max_trajectory_length])
batched_masks = np.zeros(
[num_trajectories, max_trajectory_length])
batched_log_probs = np.zeros(
[num_trajectories, max_trajectory_length])
for traj_idx, traj_start in enumerate(trajectory_starts):
traj_end = (trajectory_starts[traj_idx + 1] if traj_idx +
1 < len(trajectory_starts) else len(rewards))
traj_length = traj_end - traj_start
batched_rewards[
traj_idx, :traj_length] = rewards[traj_start:traj_end]
batched_masks[traj_idx, :traj_length] = 1.
batched_log_probs[traj_idx, :traj_length] = (
-behavior_log_probs[traj_start:traj_end] +
target_log_probs[traj_start:traj_end])
batched_weights = (
batched_masks *
(discount**np.arange(max_trajectory_length))[None, :])
clipped_log_probs = np.clip(batched_log_probs, -6., 2.)
cum_log_probs = batched_masks * np.cumsum(clipped_log_probs,
axis=1)
cum_log_probs_offset = np.max(cum_log_probs, axis=0)
cum_probs = np.exp(cum_log_probs -
cum_log_probs_offset[None, :])
avg_cum_probs = (
np.sum(cum_probs * trajectory_weights[:, None], axis=0) /
(1e-10 + np.sum(
batched_masks * trajectory_weights[:, None], axis=0)))
norm_cum_probs = cum_probs / (1e-10 + avg_cum_probs[None, :])
weighted_rewards = batched_weights * batched_rewards * norm_cum_probs
trajectory_values = np.sum(weighted_rewards, axis=1)
avg_trajectory_value = (
(1 - discount) *
np.sum(trajectory_values * trajectory_weights) /
np.sum(trajectory_weights))
pred_returns = offset + avg_trajectory_value
pred_returns = behavior_dataset.unnormalize_rewards(pred_returns)
tf.summary.scalar('train/pred returns', pred_returns, step=i)
logging.info('pred returns=%f', pred_returns)
tf.summary.scalar('train/true minus pred returns',
policy_returns - pred_returns,
step=i)
logging.info('true minus pred returns=%f',
policy_returns - pred_returns)
def test_render(self):
cartpole_env = gym.spec('CartPole-v1').make()
cartpole_env.render = mock.MagicMock()
env = gym_wrapper.GymWrapper(cartpole_env)
env.render()
cartpole_env.render.assert_called_once()
def train_eval(
load_root_dir,
env_load_fn=None,
gym_env_wrappers=[],
monitor=False,
env_name=None,
agent_class=None,
train_metrics_callback=None,
# SacAgent args
actor_fc_layers=(256, 256),
critic_joint_fc_layers=(256, 256),
# Safety Critic training args
safety_critic_joint_fc_layers=None,
safety_critic_lr=3e-4,
safety_critic_bias_init_val=None,
safety_critic_kernel_scale=None,
n_envs=None,
target_safety=0.2,
fail_weight=None,
# Params for train
num_global_steps=10000,
batch_size=256,
# Params for eval
run_eval=False,
eval_metrics=[],
num_eval_episodes=10,
eval_interval=1000,
# Params for summaries and logging
train_checkpoint_interval=10000,
summary_interval=1000,
monitor_interval=5000,
summaries_flush_secs=10,
debug_summaries=False,
seed=None):
if isinstance(agent_class, str):
assert agent_class in ALGOS, 'trainer.train_eval: agent_class {} invalid'.format(
agent_class)
agent_class = ALGOS.get(agent_class)
train_ckpt_dir = osp.join(load_root_dir, 'train')
rb_ckpt_dir = osp.join(load_root_dir, 'train', 'replay_buffer')
py_env = env_load_fn(env_name, gym_env_wrappers=gym_env_wrappers)
tf_env = tf_py_environment.TFPyEnvironment(py_env)
if monitor:
vid_path = os.path.join(load_root_dir, 'rollouts')
monitor_env_wrapper = misc.monitor_freq(1, vid_path)
monitor_env = gym.make(env_name)
for wrapper in gym_env_wrappers:
monitor_env = wrapper(monitor_env)
monitor_env = monitor_env_wrapper(monitor_env)
# auto_reset must be False to ensure Monitor works correctly
monitor_py_env = gym_wrapper.GymWrapper(monitor_env, auto_reset=False)
if run_eval:
eval_dir = os.path.join(load_root_dir, 'eval')
n_envs = n_envs or num_eval_episodes
eval_summary_writer = tf.compat.v2.summary.create_file_writer(
eval_dir, flush_millis=summaries_flush_secs * 1000)
eval_metrics = [
tf_metrics.AverageReturnMetric(prefix='EvalMetrics',
buffer_size=num_eval_episodes,
batch_size=n_envs),
tf_metrics.AverageEpisodeLengthMetric(
prefix='EvalMetrics',
buffer_size=num_eval_episodes,
batch_size=n_envs)
] + [
tf_py_metric.TFPyMetric(m, name='EvalMetrics/{}'.format(m.name))
for m in eval_metrics
]
eval_tf_env = tf_py_environment.TFPyEnvironment(
parallel_py_environment.ParallelPyEnvironment([
lambda: env_load_fn(env_name,
gym_env_wrappers=gym_env_wrappers)
] * n_envs))
if seed:
seeds = [seed * n_envs + i for i in range(n_envs)]
try:
eval_tf_env.pyenv.seed(seeds)
except:
pass
global_step = tf.compat.v1.train.get_or_create_global_step()
time_step_spec = tf_env.time_step_spec()
observation_spec = time_step_spec.observation
action_spec = tf_env.action_spec()
actor_net = actor_distribution_network.ActorDistributionNetwork(
observation_spec,
action_spec,
fc_layer_params=actor_fc_layers,
continuous_projection_net=agents.normal_projection_net)
critic_net = agents.CriticNetwork(
(observation_spec, action_spec),
joint_fc_layer_params=critic_joint_fc_layers)
if agent_class in SAFETY_AGENTS:
safety_critic_net = agents.CriticNetwork(
(observation_spec, action_spec),
joint_fc_layer_params=critic_joint_fc_layers)
tf_agent = agent_class(time_step_spec,
action_spec,
actor_network=actor_net,
critic_network=critic_net,
safety_critic_network=safety_critic_net,
train_step_counter=global_step,
debug_summaries=False)
else:
tf_agent = agent_class(time_step_spec,
action_spec,
actor_network=actor_net,
critic_network=critic_net,
train_step_counter=global_step,
debug_summaries=False)
collect_data_spec = tf_agent.collect_data_spec
replay_buffer = tf_uniform_replay_buffer.TFUniformReplayBuffer(
collect_data_spec, batch_size=1, max_length=1000000)
replay_buffer = misc.load_rb_ckpt(rb_ckpt_dir, replay_buffer)
tf_agent, _ = misc.load_agent_ckpt(train_ckpt_dir, tf_agent)
if agent_class in SAFETY_AGENTS:
target_safety = target_safety or tf_agent._target_safety
loaded_train_steps = global_step.numpy()
logging.info("Loaded agent from %s trained for %d steps", train_ckpt_dir,
loaded_train_steps)
global_step.assign(0)
tf.summary.experimental.set_step(global_step)
thresholds = [target_safety, 0.5]
sc_metrics = [
tf.keras.metrics.AUC(name='safety_critic_auc'),
tf.keras.metrics.BinaryAccuracy(name='safety_critic_acc',
threshold=0.5),
tf.keras.metrics.TruePositives(name='safety_critic_tp',
thresholds=thresholds),
tf.keras.metrics.FalsePositives(name='safety_critic_fp',
thresholds=thresholds),
tf.keras.metrics.TrueNegatives(name='safety_critic_tn',
thresholds=thresholds),
tf.keras.metrics.FalseNegatives(name='safety_critic_fn',
thresholds=thresholds)
]
if seed:
tf.compat.v1.set_random_seed(seed)
summaries_flush_secs = 10
timestamp = datetime.utcnow().strftime('%Y-%m-%d-%H-%M-%S')
offline_train_dir = osp.join(train_ckpt_dir, 'offline', timestamp)
config_saver = gin.tf.GinConfigSaverHook(offline_train_dir,
summarize_config=True)
tf.function(config_saver.after_create_session)()
sc_summary_writer = tf.compat.v2.summary.create_file_writer(
offline_train_dir, flush_millis=summaries_flush_secs * 1000)
sc_summary_writer.set_as_default()
if safety_critic_kernel_scale is not None:
ki = tf.compat.v1.variance_scaling_initializer(
scale=safety_critic_kernel_scale,
mode='fan_in',
distribution='truncated_normal')
else:
ki = tf.compat.v1.keras.initializers.VarianceScaling(
scale=1. / 3., mode='fan_in', distribution='uniform')
if safety_critic_bias_init_val is not None:
bi = tf.constant_initializer(safety_critic_bias_init_val)
else:
bi = None
sc_net_off = agents.CriticNetwork(
(observation_spec, action_spec),
joint_fc_layer_params=safety_critic_joint_fc_layers,
kernel_initializer=ki,
value_bias_initializer=bi,
name='SafetyCriticOffline')
sc_net_off.create_variables()
target_sc_net_off = common.maybe_copy_target_network_with_checks(
sc_net_off, None, 'TargetSafetyCriticNetwork')
optimizer = tf.keras.optimizers.Adam(safety_critic_lr)
sc_net_off_ckpt_dir = os.path.join(offline_train_dir, 'safety_critic')
sc_checkpointer = common.Checkpointer(
ckpt_dir=sc_net_off_ckpt_dir,
safety_critic=sc_net_off,
target_safety_critic=target_sc_net_off,
optimizer=optimizer,
global_step=global_step,
max_to_keep=5)
sc_checkpointer.initialize_or_restore()
resample_counter = py_metrics.CounterMetric('ActionResampleCounter')
eval_policy = agents.SafeActorPolicyRSVar(
time_step_spec=time_step_spec,
action_spec=action_spec,
actor_network=actor_net,
safety_critic_network=sc_net_off,
safety_threshold=target_safety,
resample_counter=resample_counter,
training=True)
dataset = replay_buffer.as_dataset(num_parallel_calls=3,
num_steps=2,
sample_batch_size=batch_size //
2).prefetch(3)
data = iter(dataset)
full_data = replay_buffer.gather_all()
fail_mask = tf.cast(full_data.observation['task_agn_rew'], tf.bool)
fail_step = nest_utils.fast_map_structure(
lambda *x: tf.boolean_mask(*x, fail_mask), full_data)
init_step = nest_utils.fast_map_structure(
lambda *x: tf.boolean_mask(*x, full_data.is_first()), full_data)
before_fail_mask = tf.roll(fail_mask, [-1], axis=[1])
after_init_mask = tf.roll(full_data.is_first(), [1], axis=[1])
before_fail_step = nest_utils.fast_map_structure(
lambda *x: tf.boolean_mask(*x, before_fail_mask), full_data)
after_init_step = nest_utils.fast_map_structure(
lambda *x: tf.boolean_mask(*x, after_init_mask), full_data)
filter_mask = tf.squeeze(tf.logical_or(before_fail_mask, fail_mask))
filter_mask = tf.pad(
filter_mask, [[0, replay_buffer._max_length - filter_mask.shape[0]]])
n_failures = tf.reduce_sum(tf.cast(filter_mask, tf.int32)).numpy()
failure_buffer = tf_uniform_replay_buffer.TFUniformReplayBuffer(
collect_data_spec,
batch_size=1,
max_length=n_failures,
dataset_window_shift=1)
data_utils.copy_rb(replay_buffer, failure_buffer, filter_mask)
sc_dataset_neg = failure_buffer.as_dataset(num_parallel_calls=3,
sample_batch_size=batch_size //
2,
num_steps=2).prefetch(3)
neg_data = iter(sc_dataset_neg)
get_action = lambda ts: tf_agent._actions_and_log_probs(ts)[0]
eval_sc = log_utils.eval_fn(before_fail_step, fail_step, init_step,
after_init_step, get_action)
losses = []
mean_loss = tf.keras.metrics.Mean(name='mean_ep_loss')
target_update = train_utils.get_target_updater(sc_net_off,
target_sc_net_off)
with tf.summary.record_if(
lambda: tf.math.equal(global_step % summary_interval, 0)):
while global_step.numpy() < num_global_steps:
pos_experience, _ = next(data)
neg_experience, _ = next(neg_data)
exp = data_utils.concat_batches(pos_experience, neg_experience,
collect_data_spec)
boundary_mask = tf.logical_not(exp.is_boundary()[:, 0])
exp = nest_utils.fast_map_structure(
lambda *x: tf.boolean_mask(*x, boundary_mask), exp)
safe_rew = exp.observation['task_agn_rew'][:, 1]
if fail_weight:
weights = tf.where(tf.cast(safe_rew, tf.bool),
fail_weight / 0.5, (1 - fail_weight) / 0.5)
else:
weights = None
train_loss, sc_loss, lam_loss = train_step(
exp,
safe_rew,
tf_agent,
sc_net=sc_net_off,
target_sc_net=target_sc_net_off,
metrics=sc_metrics,
weights=weights,
target_safety=target_safety,
optimizer=optimizer,
target_update=target_update,
debug_summaries=debug_summaries)
global_step.assign_add(1)
global_step_val = global_step.numpy()
losses.append(
(train_loss.numpy(), sc_loss.numpy(), lam_loss.numpy()))
mean_loss(train_loss)
with tf.name_scope('Losses'):
tf.compat.v2.summary.scalar(name='sc_loss',
data=sc_loss,
step=global_step_val)
tf.compat.v2.summary.scalar(name='lam_loss',
data=lam_loss,
step=global_step_val)
if global_step_val % summary_interval == 0:
tf.compat.v2.summary.scalar(name=mean_loss.name,
data=mean_loss.result(),
step=global_step_val)
if global_step_val % summary_interval == 0:
with tf.name_scope('Metrics'):
for metric in sc_metrics:
if len(tf.squeeze(metric.result()).shape) == 0:
tf.compat.v2.summary.scalar(name=metric.name,
data=metric.result(),
step=global_step_val)
else:
fmt_str = '_{}'.format(thresholds[0])
tf.compat.v2.summary.scalar(
name=metric.name + fmt_str,
data=metric.result()[0],
step=global_step_val)
fmt_str = '_{}'.format(thresholds[1])
tf.compat.v2.summary.scalar(
name=metric.name + fmt_str,
data=metric.result()[1],
step=global_step_val)
metric.reset_states()
if global_step_val % eval_interval == 0:
eval_sc(sc_net_off, step=global_step_val)
if run_eval:
results = metric_utils.eager_compute(
eval_metrics,
eval_tf_env,
eval_policy,
num_episodes=num_eval_episodes,
train_step=global_step,
summary_writer=eval_summary_writer,
summary_prefix='EvalMetrics',
)
if train_metrics_callback is not None:
train_metrics_callback(results, global_step_val)
metric_utils.log_metrics(eval_metrics)
with eval_summary_writer.as_default():
for eval_metric in eval_metrics[2:]:
eval_metric.tf_summaries(
train_step=global_step,
step_metrics=eval_metrics[:2])
if monitor and global_step_val % monitor_interval == 0:
monitor_time_step = monitor_py_env.reset()
monitor_policy_state = eval_policy.get_initial_state(1)
ep_len = 0
monitor_start = time.time()
while not monitor_time_step.is_last():
monitor_action = eval_policy.action(
monitor_time_step, monitor_policy_state)
action, monitor_policy_state = monitor_action.action, monitor_action.state
monitor_time_step = monitor_py_env.step(action)
ep_len += 1
logging.debug(
'saved rollout at timestep %d, rollout length: %d, %4.2f sec',
global_step_val, ep_len,
time.time() - monitor_start)
if global_step_val % train_checkpoint_interval == 0:
sc_checkpointer.save(global_step=global_step_val)
def train_eval(
root_dir,
load_root_dir=None,
env_load_fn=None,
gym_env_wrappers=[],
monitor=False,
env_name=None,
agent_class=None,
initial_collect_driver_class=None,
collect_driver_class=None,
online_driver_class=dynamic_episode_driver.DynamicEpisodeDriver,
num_global_steps=1000000,
rb_size=None,
train_steps_per_iteration=1,
train_metrics=None,
eval_metrics=None,
train_metrics_callback=None,
# SacAgent args
actor_fc_layers=(256, 256),
critic_joint_fc_layers=(256, 256),
# Safety Critic training args
sc_rb_size=None,
target_safety=None,
train_sc_steps=10,
train_sc_interval=1000,
online_critic=False,
n_envs=None,
finetune_sc=False,
pretraining=True,
lambda_schedule_nsteps=0,
lambda_initial=0.,
lambda_final=1.,
kstep_fail=0,
# Ensemble Critic training args
num_critics=None,
critic_learning_rate=3e-4,
# Wcpg Critic args
critic_preprocessing_layer_size=256,
# Params for train
batch_size=256,
# Params for eval
run_eval=False,
num_eval_episodes=10,
eval_interval=1000,
# Params for summaries and logging
train_checkpoint_interval=10000,
policy_checkpoint_interval=5000,
rb_checkpoint_interval=50000,
keep_rb_checkpoint=False,
log_interval=1000,
summary_interval=1000,
monitor_interval=5000,
summaries_flush_secs=10,
early_termination_fn=None,
debug_summaries=False,
seed=None,
eager_debug=False,
env_metric_factories=None,
wandb=False): # pylint: disable=unused-argument
"""train and eval script for SQRL."""
if isinstance(agent_class, str):
assert agent_class in ALGOS, 'trainer.train_eval: agent_class {} invalid'.format(agent_class)
agent_class = ALGOS.get(agent_class)
n_envs = n_envs or num_eval_episodes
root_dir = os.path.expanduser(root_dir)
train_dir = os.path.join(root_dir, 'train')
# =====================================================================#
# Setup summary metrics, file writers, and create env #
# =====================================================================#
train_summary_writer = tf.compat.v2.summary.create_file_writer(
train_dir, flush_millis=summaries_flush_secs * 1000)
train_summary_writer.set_as_default()
train_metrics = train_metrics or []
eval_metrics = eval_metrics or []
updating_sc = online_critic and (not load_root_dir or finetune_sc)
logging.debug('updating safety critic: %s', updating_sc)
if seed:
tf.compat.v1.set_random_seed(seed)
if agent_class in SAFETY_AGENTS:
if online_critic:
sc_tf_env = tf_py_environment.TFPyEnvironment(
parallel_py_environment.ParallelPyEnvironment(
[lambda: env_load_fn(env_name)] * n_envs
))
if seed:
seeds = [seed * n_envs + i for i in range(n_envs)]
try:
sc_tf_env.pyenv.seed(seeds)
except:
pass
if run_eval:
eval_dir = os.path.join(root_dir, 'eval')
eval_summary_writer = tf.compat.v2.summary.create_file_writer(
eval_dir, flush_millis=summaries_flush_secs * 1000)
eval_metrics = [
tf_metrics.AverageReturnMetric(buffer_size=num_eval_episodes, batch_size=n_envs),
tf_metrics.AverageEpisodeLengthMetric(buffer_size=num_eval_episodes, batch_size=n_envs),
] + [tf_py_metric.TFPyMetric(m) for m in eval_metrics]
eval_tf_env = tf_py_environment.TFPyEnvironment(
parallel_py_environment.ParallelPyEnvironment(
[lambda: env_load_fn(env_name)] * n_envs
))
if seed:
try:
for i, pyenv in enumerate(eval_tf_env.pyenv.envs):
pyenv.seed(seed * n_envs + i)
except:
pass
elif 'Drunk' in env_name:
# Just visualizes trajectories in drunk spider environment
eval_tf_env = tf_py_environment.TFPyEnvironment(
env_load_fn(env_name))
else:
eval_tf_env = None
if monitor:
vid_path = os.path.join(root_dir, 'rollouts')
monitor_env_wrapper = misc.monitor_freq(1, vid_path)
monitor_env = gym.make(env_name)
for wrapper in gym_env_wrappers:
monitor_env = wrapper(monitor_env)
monitor_env = monitor_env_wrapper(monitor_env)
# auto_reset must be False to ensure Monitor works correctly
monitor_py_env = gym_wrapper.GymWrapper(monitor_env, auto_reset=False)
global_step = tf.compat.v1.train.get_or_create_global_step()
with tf.summary.record_if(
lambda: tf.math.equal(global_step % summary_interval, 0)):
py_env = env_load_fn(env_name)
tf_env = tf_py_environment.TFPyEnvironment(py_env)
if seed:
try:
for i, pyenv in enumerate(tf_env.pyenv.envs):
pyenv.seed(seed * n_envs + i)
except:
pass
time_step_spec = tf_env.time_step_spec()
observation_spec = time_step_spec.observation
action_spec = tf_env.action_spec()
logging.debug('obs spec: %s', observation_spec)
logging.debug('action spec: %s', action_spec)
# =====================================================================#
# Setup agent class #
# =====================================================================#
if agent_class == wcpg_agent.WcpgAgent:
alpha_spec = tensor_spec.BoundedTensorSpec(shape=(1,), dtype=tf.float32, minimum=0., maximum=1.,
name='alpha')
input_tensor_spec = (observation_spec, action_spec, alpha_spec)
critic_net = agents.DistributionalCriticNetwork(
input_tensor_spec, preprocessing_layer_size=critic_preprocessing_layer_size,
joint_fc_layer_params=critic_joint_fc_layers)
actor_net = agents.WcpgActorNetwork((observation_spec, alpha_spec), action_spec)
else:
actor_net = actor_distribution_network.ActorDistributionNetwork(
observation_spec,
action_spec,
fc_layer_params=actor_fc_layers,
continuous_projection_net=agents.normal_projection_net)
critic_net = agents.CriticNetwork(
(observation_spec, action_spec),
joint_fc_layer_params=critic_joint_fc_layers)
if agent_class in SAFETY_AGENTS:
logging.debug('Making SQRL agent')
if lambda_schedule_nsteps > 0:
lambda_update_every_nsteps = num_global_steps // lambda_schedule_nsteps
step_size = (lambda_final - lambda_initial) / lambda_update_every_nsteps
lambda_scheduler = lambda lam: common.periodically(
body=lambda: tf.group(lam.assign(lam + step_size)),
period=lambda_update_every_nsteps)
else:
lambda_scheduler = None
safety_critic_net = agents.CriticNetwork(
(observation_spec, action_spec),
joint_fc_layer_params=critic_joint_fc_layers)
ts = target_safety
thresholds = [ts, 0.5]
sc_metrics = [tf.keras.metrics.AUC(name='safety_critic_auc'),
tf.keras.metrics.TruePositives(name='safety_critic_tp',
thresholds=thresholds),
tf.keras.metrics.FalsePositives(name='safety_critic_fp',
thresholds=thresholds),
tf.keras.metrics.TrueNegatives(name='safety_critic_tn',
thresholds=thresholds),
tf.keras.metrics.FalseNegatives(name='safety_critic_fn',
thresholds=thresholds),
tf.keras.metrics.BinaryAccuracy(name='safety_critic_acc',
threshold=0.5)]
tf_agent = agent_class(
time_step_spec,
action_spec,
actor_network=actor_net,
critic_network=critic_net,
safety_critic_network=safety_critic_net,
train_step_counter=global_step,
debug_summaries=debug_summaries,
safety_pretraining=pretraining,
train_critic_online=online_critic,
initial_log_lambda=lambda_initial,
log_lambda=(lambda_scheduler is None),
lambda_scheduler=lambda_scheduler)
elif agent_class is ensemble_sac_agent.EnsembleSacAgent:
critic_nets, critic_optimizers = [critic_net], [tf.keras.optimizers.Adam(critic_learning_rate)]
for _ in range(num_critics - 1):
critic_nets.append(agents.CriticNetwork((observation_spec, action_spec),
joint_fc_layer_params=critic_joint_fc_layers))
critic_optimizers.append(tf.keras.optimizers.Adam(critic_learning_rate))
tf_agent = agent_class(
time_step_spec,
action_spec,
actor_network=actor_net,
critic_networks=critic_nets,
critic_optimizers=critic_optimizers,
debug_summaries=debug_summaries
)
else: # agent is either SacAgent or WcpgAgent
logging.debug('critic input_tensor_spec: %s', critic_net.input_tensor_spec)
tf_agent = agent_class(
time_step_spec,
action_spec,
actor_network=actor_net,
critic_network=critic_net,
train_step_counter=global_step,
debug_summaries=debug_summaries)
tf_agent.initialize()
# =====================================================================#
# Setup replay buffer #
# =====================================================================#
collect_data_spec = tf_agent.collect_data_spec
logging.debug('Allocating replay buffer ...')
# Add to replay buffer and other agent specific observers.
rb_size = rb_size or 1000000
replay_buffer = tf_uniform_replay_buffer.TFUniformReplayBuffer(
collect_data_spec,
batch_size=1,
max_length=rb_size)
logging.debug('RB capacity: %i', replay_buffer.capacity)
logging.debug('ReplayBuffer Collect data spec: %s', collect_data_spec)
if agent_class in SAFETY_AGENTS:
sc_rb_size = sc_rb_size or num_eval_episodes * 500
sc_buffer = tf_uniform_replay_buffer.TFUniformReplayBuffer(
collect_data_spec, batch_size=1, max_length=sc_rb_size,
dataset_window_shift=1)
num_episodes = tf_metrics.NumberOfEpisodes()
num_env_steps = tf_metrics.EnvironmentSteps()
return_metric = tf_metrics.AverageReturnMetric(
buffer_size=num_eval_episodes, batch_size=tf_env.batch_size)
train_metrics = [
num_episodes, num_env_steps,
return_metric,
tf_metrics.AverageEpisodeLengthMetric(
buffer_size=num_eval_episodes, batch_size=tf_env.batch_size),
] + [tf_py_metric.TFPyMetric(m) for m in train_metrics]
if 'Minitaur' in env_name and not pretraining:
goal_vel = gin.query_parameter("%GOAL_VELOCITY")
early_termination_fn = train_utils.MinitaurTerminationFn(
speed_metric=train_metrics[-2], total_falls_metric=train_metrics[-3],
env_steps_metric=num_env_steps, goal_speed=goal_vel)
if env_metric_factories:
for env_metric in env_metric_factories:
train_metrics.append(tf_py_metric.TFPyMetric(env_metric(tf_env.pyenv.envs)))
if run_eval:
eval_metrics.append(env_metric([env for env in
eval_tf_env.pyenv._envs]))
# =====================================================================#
# Setup collect policies #
# =====================================================================#
if not online_critic:
eval_policy = tf_agent.policy
collect_policy = tf_agent.collect_policy
if not pretraining and agent_class in SAFETY_AGENTS:
collect_policy = tf_agent.safe_policy
else:
eval_policy = tf_agent.collect_policy if pretraining else tf_agent.safe_policy
collect_policy = tf_agent.collect_policy if pretraining else tf_agent.safe_policy
online_collect_policy = tf_agent.safe_policy # if pretraining else tf_agent.collect_policy
if pretraining:
online_collect_policy._training = False
if not load_root_dir:
initial_collect_policy = random_tf_policy.RandomTFPolicy(time_step_spec, action_spec)
else:
initial_collect_policy = collect_policy
if agent_class == wcpg_agent.WcpgAgent:
initial_collect_policy = agents.WcpgPolicyWrapper(initial_collect_policy)
# =====================================================================#
# Setup Checkpointing #
# =====================================================================#
train_checkpointer = common.Checkpointer(
ckpt_dir=train_dir,
agent=tf_agent,
global_step=global_step,
metrics=metric_utils.MetricsGroup(train_metrics, 'train_metrics'))
policy_checkpointer = common.Checkpointer(
ckpt_dir=os.path.join(train_dir, 'policy'),
policy=eval_policy,
global_step=global_step)
rb_ckpt_dir = os.path.join(train_dir, 'replay_buffer')
rb_checkpointer = common.Checkpointer(
ckpt_dir=rb_ckpt_dir, max_to_keep=1, replay_buffer=replay_buffer)
if online_critic:
online_rb_ckpt_dir = os.path.join(train_dir, 'online_replay_buffer')
online_rb_checkpointer = common.Checkpointer(
ckpt_dir=online_rb_ckpt_dir,
max_to_keep=1,
replay_buffer=sc_buffer)
# loads agent, replay buffer, and online sc/buffer if online_critic
if load_root_dir:
load_root_dir = os.path.expanduser(load_root_dir)
load_train_dir = os.path.join(load_root_dir, 'train')
misc.load_agent_ckpt(load_train_dir, tf_agent)
if len(os.listdir(os.path.join(load_train_dir, 'replay_buffer'))) > 1:
load_rb_ckpt_dir = os.path.join(load_train_dir, 'replay_buffer')
misc.load_rb_ckpt(load_rb_ckpt_dir, replay_buffer)
if online_critic:
load_online_sc_ckpt_dir = os.path.join(load_root_dir, 'sc')
load_online_rb_ckpt_dir = os.path.join(load_train_dir,
'online_replay_buffer')
if osp.exists(load_online_rb_ckpt_dir):
misc.load_rb_ckpt(load_online_rb_ckpt_dir, sc_buffer)
if osp.exists(load_online_sc_ckpt_dir):
misc.load_safety_critic_ckpt(load_online_sc_ckpt_dir,
safety_critic_net)
elif agent_class in SAFETY_AGENTS:
offline_run = sorted(os.listdir(os.path.join(load_train_dir, 'offline')))[-1]
load_sc_ckpt_dir = os.path.join(load_train_dir, 'offline',
offline_run, 'safety_critic')
if osp.exists(load_sc_ckpt_dir):
sc_net_off = agents.CriticNetwork(
(observation_spec, action_spec),
joint_fc_layer_params=(512, 512),
name='SafetyCriticOffline')
sc_net_off.create_variables()
target_sc_net_off = common.maybe_copy_target_network_with_checks(
sc_net_off, None, 'TargetSafetyCriticNetwork')
sc_optimizer = tf.keras.optimizers.Adam(critic_learning_rate)
_ = misc.load_safety_critic_ckpt(
load_sc_ckpt_dir, safety_critic_net=sc_net_off,
target_safety_critic=target_sc_net_off,
optimizer=sc_optimizer)
tf_agent._safety_critic_network = sc_net_off
tf_agent._target_safety_critic_network = target_sc_net_off
tf_agent._safety_critic_optimizer = sc_optimizer
else:
train_checkpointer.initialize_or_restore()
rb_checkpointer.initialize_or_restore()
if online_critic:
online_rb_checkpointer.initialize_or_restore()
if agent_class in SAFETY_AGENTS:
sc_dir = os.path.join(root_dir, 'sc')
safety_critic_checkpointer = common.Checkpointer(
ckpt_dir=sc_dir,
safety_critic=tf_agent._safety_critic_network,
# pylint: disable=protected-access
target_safety_critic=tf_agent._target_safety_critic_network,
optimizer=tf_agent._safety_critic_optimizer,
global_step=global_step)
if not (load_root_dir and not online_critic):
safety_critic_checkpointer.initialize_or_restore()
agent_observers = [replay_buffer.add_batch] + train_metrics
collect_driver = collect_driver_class(
tf_env, collect_policy, observers=agent_observers)
collect_driver.run = common.function_in_tf1()(collect_driver.run)
if online_critic:
logging.debug('online driver class: %s', online_driver_class)
online_agent_observers = [num_episodes, num_env_steps,
sc_buffer.add_batch]
online_driver = online_driver_class(
sc_tf_env, online_collect_policy, observers=online_agent_observers,
num_episodes=num_eval_episodes)
online_driver.run = common.function_in_tf1()(online_driver.run)
if eager_debug:
tf.config.experimental_run_functions_eagerly(True)
else:
config_saver = gin.tf.GinConfigSaverHook(train_dir, summarize_config=True)
tf.function(config_saver.after_create_session)()
if global_step == 0:
logging.info('Performing initial collection ...')
init_collect_observers = agent_observers
if agent_class in SAFETY_AGENTS:
init_collect_observers += [sc_buffer.add_batch]
initial_collect_driver_class(
tf_env,
initial_collect_policy,
observers=init_collect_observers).run()
last_id = replay_buffer._get_last_id() # pylint: disable=protected-access
logging.info('Data saved after initial collection: %d steps', last_id)
if agent_class in SAFETY_AGENTS:
last_id = sc_buffer._get_last_id() # pylint: disable=protected-access
logging.debug('Data saved in sc_buffer after initial collection: %d steps', last_id)
if run_eval:
results = metric_utils.eager_compute(
eval_metrics,
eval_tf_env,
eval_policy,
num_episodes=num_eval_episodes,
train_step=global_step,
summary_writer=eval_summary_writer,
summary_prefix='EvalMetrics',
)
if train_metrics_callback is not None:
train_metrics_callback(results, global_step.numpy())
metric_utils.log_metrics(eval_metrics)
time_step = None
policy_state = collect_policy.get_initial_state(tf_env.batch_size)
timed_at_step = global_step.numpy()
time_acc = 0
train_step = train_utils.get_train_step(tf_agent, replay_buffer, batch_size)
if agent_class in SAFETY_AGENTS:
critic_train_step = train_utils.get_critic_train_step(
tf_agent, replay_buffer, sc_buffer, batch_size=batch_size,
updating_sc=updating_sc, metrics=sc_metrics)
if early_termination_fn is None:
early_termination_fn = lambda: False
loss_diverged = False
# How many consecutive steps was loss diverged for.
loss_divergence_counter = 0
mean_train_loss = tf.keras.metrics.Mean(name='mean_train_loss')
if agent_class in SAFETY_AGENTS:
resample_counter = collect_policy._resample_counter
mean_resample_ac = tf.keras.metrics.Mean(name='mean_unsafe_ac_freq')
sc_metrics.append(mean_resample_ac)
if online_critic:
logging.debug('starting safety critic pretraining')
# don't fine-tune safety critic
if global_step.numpy() == 0:
for _ in range(train_sc_steps):
sc_loss, lambda_loss = critic_train_step()
critic_results = [('sc_loss', sc_loss.numpy()), ('lambda_loss', lambda_loss.numpy())]
for critic_metric in sc_metrics:
res = critic_metric.result().numpy()
if not res.shape:
critic_results.append((critic_metric.name, res))
else:
for r, thresh in zip(res, thresholds):
name = '_'.join([critic_metric.name, str(thresh)])
critic_results.append((name, r))
critic_metric.reset_states()
if train_metrics_callback:
train_metrics_callback(collections.OrderedDict(critic_results),
step=global_step.numpy())
logging.debug('Starting main train loop...')
curr_ep = []
global_step_val = global_step.numpy()
while global_step_val <= num_global_steps and not early_termination_fn():
start_time = time.time()
# MEASURE ACTION RESAMPLING FREQUENCY
if agent_class in SAFETY_AGENTS:
if pretraining and global_step_val == num_global_steps // 2:
if online_critic:
online_collect_policy._training = True
collect_policy._training = True
if online_critic or collect_policy._training:
mean_resample_ac(resample_counter.result())
resample_counter.reset()
if time_step is None or time_step.is_last():
resample_ac_freq = mean_resample_ac.result()
mean_resample_ac.reset_states()
tf.compat.v2.summary.scalar(
name='resample_ac_freq', data=resample_ac_freq, step=global_step)
# RUN COLLECTION
time_step, policy_state = collect_driver.run(
time_step=time_step,
policy_state=policy_state,
)
# get last step taken by step_driver
traj = replay_buffer._data_table.read(replay_buffer._get_last_id() %
replay_buffer._capacity)
curr_ep.append(traj)
if time_step.is_last():
if agent_class in SAFETY_AGENTS:
if time_step.observation['task_agn_rew']:
if kstep_fail:
# applies task agn rew. over last k steps
for i, traj in enumerate(curr_ep[-kstep_fail:]):
traj.observation['task_agn_rew'] = 1.
sc_buffer.add_batch(traj)
else:
[sc_buffer.add_batch(traj) for traj in curr_ep]
curr_ep = []
if agent_class == wcpg_agent.WcpgAgent:
collect_policy._alpha = None # reset WCPG alpha
if (global_step_val + 1) % log_interval == 0:
logging.debug('policy eval: %4.2f sec', time.time() - start_time)
# PERFORMS TRAIN STEP ON ALGORITHM (OFF-POLICY)
for _ in range(train_steps_per_iteration):
train_loss = train_step()
mean_train_loss(train_loss.loss)
current_step = global_step.numpy()
total_loss = mean_train_loss.result()
mean_train_loss.reset_states()
if train_metrics_callback and current_step % summary_interval == 0:
train_metrics_callback(
collections.OrderedDict([(k, v.numpy()) for k, v in
train_loss.extra._asdict().items()]),
step=current_step)
train_metrics_callback(
{'train_loss': total_loss.numpy()}, step=current_step)
# TRAIN AND/OR EVAL SAFETY CRITIC
if agent_class in SAFETY_AGENTS and current_step % train_sc_interval == 0:
if online_critic:
batch_time_step = sc_tf_env.reset()
# run online critic training collect & update
batch_policy_state = online_collect_policy.get_initial_state(
sc_tf_env.batch_size)
online_driver.run(time_step=batch_time_step,
policy_state=batch_policy_state)
for _ in range(train_sc_steps):
sc_loss, lambda_loss = critic_train_step()
# log safety_critic loss results
critic_results = [('sc_loss', sc_loss.numpy()),
('lambda_loss', lambda_loss.numpy())]
metric_utils.log_metrics(sc_metrics)
for critic_metric in sc_metrics:
res = critic_metric.result().numpy()
if not res.shape:
critic_results.append((critic_metric.name, res))
else:
for r, thresh in zip(res, thresholds):
name = '_'.join([critic_metric.name, str(thresh)])
critic_results.append((name, r))
critic_metric.reset_states()
if train_metrics_callback and current_step % summary_interval == 0:
train_metrics_callback(collections.OrderedDict(critic_results),
step=current_step)
# Check for exploding losses.
if (math.isnan(total_loss) or math.isinf(total_loss) or
total_loss > MAX_LOSS):
loss_divergence_counter += 1
if loss_divergence_counter > TERMINATE_AFTER_DIVERGED_LOSS_STEPS:
loss_diverged = True
logging.info('Loss diverged, critic_loss: %s, actor_loss: %s',
train_loss.extra.critic_loss,
train_loss.extra.actor_loss)
break
else:
loss_divergence_counter = 0
time_acc += time.time() - start_time
# LOGGING AND METRICS
if current_step % log_interval == 0:
metric_utils.log_metrics(train_metrics)
logging.info('step = %d, loss = %f', current_step, total_loss)
steps_per_sec = (current_step - timed_at_step) / time_acc
logging.info('%4.2f steps/sec', steps_per_sec)
tf.compat.v2.summary.scalar(
name='global_steps_per_sec', data=steps_per_sec, step=global_step)
timed_at_step = current_step
time_acc = 0
train_results = []
for metric in train_metrics[2:]:
if isinstance(metric, (metrics.AverageEarlyFailureMetric,
metrics.AverageFallenMetric,
metrics.AverageSuccessMetric)):
# Plot failure as a fn of return
metric.tf_summaries(
train_step=global_step, step_metrics=[num_env_steps, num_episodes,
return_metric])
else:
metric.tf_summaries(
train_step=global_step, step_metrics=[num_env_steps, num_env_steps])
train_results.append((metric.name, metric.result().numpy()))
if train_metrics_callback and current_step % summary_interval == 0:
train_metrics_callback(collections.OrderedDict(train_results),
step=global_step.numpy())
if current_step % train_checkpoint_interval == 0:
train_checkpointer.save(global_step=current_step)
if current_step % policy_checkpoint_interval == 0:
policy_checkpointer.save(global_step=current_step)
if agent_class in SAFETY_AGENTS:
safety_critic_checkpointer.save(global_step=current_step)
if online_critic:
online_rb_checkpointer.save(global_step=current_step)
if rb_checkpoint_interval and current_step % rb_checkpoint_interval == 0:
rb_checkpointer.save(global_step=current_step)
if wandb and current_step % eval_interval == 0 and "Drunk" in env_name:
misc.record_point_mass_episode(eval_tf_env, eval_policy, current_step)
if online_critic:
misc.record_point_mass_episode(eval_tf_env, tf_agent.safe_policy,
current_step, 'safe-trajectory')
if run_eval and current_step % eval_interval == 0:
eval_results = metric_utils.eager_compute(
eval_metrics,
eval_tf_env,
eval_policy,
num_episodes=num_eval_episodes,
train_step=global_step,
summary_writer=eval_summary_writer,
summary_prefix='EvalMetrics',
)
if train_metrics_callback is not None:
train_metrics_callback(eval_results, current_step)
metric_utils.log_metrics(eval_metrics)
with eval_summary_writer.as_default():
for eval_metric in eval_metrics[2:]:
eval_metric.tf_summaries(train_step=global_step,
step_metrics=eval_metrics[:2])
if monitor and current_step % monitor_interval == 0:
monitor_time_step = monitor_py_env.reset()
monitor_policy_state = eval_policy.get_initial_state(1)
ep_len = 0
monitor_start = time.time()
while not monitor_time_step.is_last():
monitor_action = eval_policy.action(monitor_time_step, monitor_policy_state)
action, monitor_policy_state = monitor_action.action, monitor_action.state
monitor_time_step = monitor_py_env.step(action)
ep_len += 1
logging.debug('saved rollout at timestep %d, rollout length: %d, %4.2f sec',
current_step, ep_len, time.time() - monitor_start)
global_step_val = current_step
if early_termination_fn():
# Early stopped, save all checkpoints if not saved
if global_step_val % train_checkpoint_interval != 0:
train_checkpointer.save(global_step=global_step_val)
if global_step_val % policy_checkpoint_interval != 0:
policy_checkpointer.save(global_step=global_step_val)
if agent_class in SAFETY_AGENTS:
safety_critic_checkpointer.save(global_step=global_step_val)
if online_critic:
online_rb_checkpointer.save(global_step=global_step_val)
if rb_checkpoint_interval and global_step_val % rb_checkpoint_interval == 0:
rb_checkpointer.save(global_step=global_step_val)
if not keep_rb_checkpoint:
misc.cleanup_checkpoints(rb_ckpt_dir)
if loss_diverged:
# Raise an error at the very end after the cleanup.
raise ValueError('Loss diverged to {} at step {}, terminating.'.format(
total_loss, global_step.numpy()))
return total_loss
replay_buffer_capacity = 100000
fc_layer_params = (100, )
batch_size = 64
learning_rate = 1e-3
log_interval = 200
num_eval_episodes = 10
eval_interval = 1000
eval_interval = 50
# env_name = 'CartPole-v0'
env_name = 'oscillator-v0'
train_env = envs.make(env_name)
train_py_env = gym_wrapper.GymWrapper(train_env)
eval_env = envs.make(env_name)
eval_py_env = gym_wrapper.GymWrapper(eval_env)
print('Observation spec: {}'.format(train_py_env.time_step_spec().observation))
print('Action spec: {}'.format(train_py_env.action_spec()))
train_env = tf_py_environment.TFPyEnvironment(train_py_env)
eval_env = tf_py_environment.TFPyEnvironment(eval_py_env)
q_net = q_network.QNetwork(train_env.observation_spec(),
train_env.action_spec(),
fc_layer_params=fc_layer_params)
optimizer = tf.compat.v1.train.AdamOptimizer(learning_rate=learning_rate)
# optimizer = tf.optimizers.Adam(learning_rate=learning_rate)
