env = VizdoomBasic
env_fn = env()
actor_critic = core.gru_actor_critic
ac_kwargs=dict()
seed = 0
gru_units = 256
# batch_size = 10000
n = 200
epochs=100
trials_per_epoch = 20
episodes_per_trial = 2
max_ep_len=250
gamma=0.99
clip_ratio=0.2
pi_lr=3e-4
vf_lr=1e-3
train_pi_iters=100
train_v_iters=100
lam=0.3
target_kl=0.01
logger_kwargs=dict()
save_freq=10
from run_utils import setup_logger_kwargs
logger_kwargs = setup_logger_kwargs(exp_name, seed)
ppo(lambda: env_fn, actor_critic, ac_kwargs, seed, gru_units,
trials_per_epoch, episodes_per_trial, n, epochs, gamma, clip_ratio, pi_lr,
vf_lr, train_pi_iters, train_v_iters, lam, max_ep_len,
target_kl, logger_kwargs, save_freq)
n += 1
test_logger.log_tabular('EpRet', with_min_and_max=True)
test_logger.log_tabular('EpLen', average_only=True)
test_logger.dump_tabular()
if __name__ == '__main__':
parser = argparse.ArgumentParser()
parser.add_argument('--env', type=str, default='HalfCheetah-v2')
parser.add_argument('--hid', type=int, default=300)
parser.add_argument('--l', type=int, default=1)
parser.add_argument('--gamma', type=float, default=0.99)
parser.add_argument('--seed', '-s', type=int, default=0)
parser.add_argument('--epochs', type=int, default=100)
parser.add_argument('--exp_name', type=str, default='ddpg')
parser.add_argument('--test', '-t', default=False, action='store_true')
args = parser.parse_args()
from run_utils import setup_logger_kwargs
logger_kwargs = setup_logger_kwargs(args.exp_name, args.seed)
ddpg(args.env,
actor_critic=core.mlp_actor_critic,
ac_kwargs=dict(hidden_sizes=[args.hid] * args.l),
gamma=args.gamma,
seed=args.seed,
epochs=args.epochs,
logger_kwargs=logger_kwargs,
test=args.test)
def sac(args, steps_per_epoch=1500, replay_size=int(1e6), gamma=0.99,
polyak=0.995, lr=1e-3, alpha=3e-4, batch_size=128, start_steps=1000,
update_after=1000, update_every=1, num_test_episodes=10, max_ep_len=150,
logger_kwargs=dict(), save_freq=1):
logger_kwargs = setup_logger_kwargs(args.exp_name, args.seed)
torch.set_num_threads(torch.get_num_threads())
actor_critic = core.MLPActorCritic
ac_kwargs = dict(hidden_sizes=[args.hid] * args.l)
gamma = args.gamma
seed = args.seed
epochs = args.epochs
logger_tensor = Logger(logdir=args.logdir, run_name="{}-{}".format(args.model_name, time.ctime()))
logger = EpochLogger(**logger_kwargs)
logger.save_config(locals())
torch.manual_seed(seed)
np.random.seed(seed)
env = ML1.get_train_tasks('reach-v1') # Create an environment with task `pick_place`
tasks = env.sample_tasks(1) # Sample a task (in this case, a goal variation)
env.set_task(tasks[0]) # Set task
test_env = ML1.get_train_tasks('reach-v1') # Create an environment with task `pick_place`
tasks = env.sample_tasks(1) # Sample a task (in this case, a goal variation)
test_env.set_task(tasks[0]) # Set task
obs_dim = env.observation_space.shape
act_dim = env.action_space.shape[0]
# Action limit for clamping: critically, assumes all dimensions share the same bound!
act_limit = env.action_space.high[0]
# Create actor-critic module and target networks
ac = actor_critic(env.observation_space, env.action_space, **ac_kwargs)
ac_targ = deepcopy(ac)
# Freeze target networks with respect to optimizers (only update via polyak averaging)
for p in ac_targ.parameters():
p.requires_grad = False
# List of parameters for both Q-networks (save this for convenience)
q_params = itertools.chain(ac.q1.parameters(), ac.q2.parameters())
# Experience buffer
replay_buffer = ReplayBuffer(obs_dim=obs_dim, act_dim=act_dim, size=replay_size)
# Count variables (protip: try to get a feel for how different size networks behave!)
var_counts = tuple(core.count_vars(module) for module in [ac.pi, ac.q1, ac.q2])
logger.log('\nNumber of parameters: \t pi: %d, \t q1: %d, \t q2: %d\n' % var_counts)
# Set up function for computing SAC Q-losses
def compute_loss_q(data):
o, a, r, o2, d = data['obs'], data['act'], data['rew'], data['obs2'], data['done']
q1 = ac.q1(o, a)
q2 = ac.q2(o, a)
# Bellman backup for Q functions
with torch.no_grad():
# Target actions come from *current* policy
a2, logp_a2 = ac.pi(o2)
# Target Q-values
q1_pi_targ = ac_targ.q1(o2, a2)
q2_pi_targ = ac_targ.q2(o2, a2)
q_pi_targ = torch.min(q1_pi_targ, q2_pi_targ)
backup = r + gamma * (1 - d) * (q_pi_targ - alpha * logp_a2)
# MSE loss against Bellman backup
loss_q1 = ((q1 - backup) ** 2).mean()
loss_q2 = ((q2 - backup) ** 2).mean()
loss_q = loss_q1 + loss_q2
# Useful info for logging
q_info = dict(Q1Vals=q1.detach().numpy(),
Q2Vals=q2.detach().numpy())
return loss_q, q_info
# Set up function for computing SAC pi loss
def compute_loss_pi(data):
o = data['obs']
pi, logp_pi = ac.pi(o)
q1_pi = ac.q1(o, pi)
q2_pi = ac.q2(o, pi)
q_pi = torch.min(q1_pi, q2_pi)
# Entropy-regularized policy loss
loss_pi = (alpha * logp_pi - q_pi).mean()
# Useful info for logging
pi_info = dict(LogPi=logp_pi.detach().numpy())
return loss_pi, pi_info
# Set up optimizers for policy and q-function
pi_optimizer = Adam(ac.pi.parameters(), lr=3e-4)
q_optimizer = Adam(q_params, lr=3e-4)
# Set up model saving
logger.setup_pytorch_saver(ac)
def update(data, logger_tensor, t):
# First run one gradient descent step for Q1 and Q2
q_optimizer.zero_grad()
loss_q, q_info = compute_loss_q(data)
loss_q.backward()
q_optimizer.step()
# Record things
logger.store(LossQ=loss_q.item(), **q_info)
logger_tensor.log_value(t, loss_q.item(), "loss q")
# Freeze Q-networks so you don't waste computational effort
# computing gradients for them during the policy learning step.
for p in q_params:
p.requires_grad = False
# Next run one gradient descent step for pi.
pi_optimizer.zero_grad()
loss_pi, pi_info = compute_loss_pi(data)
loss_pi.backward()
pi_optimizer.step()
# Unfreeze Q-networks so you can optimize it at next DDPG step.
for p in q_params:
p.requires_grad = True
# Record things
logger.store(LossPi=loss_pi.item(), **pi_info)
logger_tensor.log_value(t, loss_pi.item(), "loss pi")
# Finally, update target networks by polyak averaging.
with torch.no_grad():
for p, p_targ in zip(ac.parameters(), ac_targ.parameters()):
# NB: We use an in-place operations "mul_", "add_" to update target
# params, as opposed to "mul" and "add", which would make new tensors.
p_targ.data.mul_(polyak)
p_targ.data.add_((1 - polyak) * p.data)
def get_action(o, deterministic=False):
return ac.act(torch.as_tensor(o, dtype=torch.float32),
deterministic)
def test_agent():
for j in range(num_test_episodes):
o, d, ep_ret, ep_len = test_env.reset(), False, 0, 0
while not (d or (ep_len == max_ep_len)):
# Take deterministic actions at test time
o, r, d, _ = test_env.step(get_action(o, True))
ep_ret += r
ep_len += 1
logger.store(TestEpRet=ep_ret, TestEpLen=ep_len)
logger_tensor.log_value(t, ep_ret, "test ep reward")
logger_tensor.log_value(t, ep_len, "test ep length")
# Prepare for interaction with environment
total_steps = steps_per_epoch * epochs
start_time = time.time()
o, ep_ret, ep_len = env.reset(), 0, 0
# Main loop: collect experience in env and update/log each epoch
for t in range(total_steps):
# Until start_steps have elapsed, randomly sample actions
# from a uniform distribution for better exploration. Afterwards,
# use the learned policy.
if t > start_steps:
a = get_action(o)
else:
a = env.action_space.sample()
# Step the env
o2, r, d, _ = env.step(a)
ep_ret += r
ep_len += 1
# Ignore the "done" signal if it comes from hitting the time
# horizon (that is, when it's an artificial terminal signal
# that isn't based on the agent's state)
d = False if ep_len == max_ep_len else d
# Store experience to replay buffer
replay_buffer.store(o, a, r, o2, d)
# Super critical, easy to overlook step: make sure to update
# most recent observation!
o = o2
# End of trajectory handling
if d or (ep_len == max_ep_len):
logger_tensor.log_value(t, ep_ret, "reward")
logging.info("> total_steps={} | reward={}".format(t, ep_ret))
logger.store(EpRet=ep_ret, EpLen=ep_len)
o, ep_ret, ep_len = env.reset(), 0, 0
# Update handling
if t >= update_after and t % update_every == 0:
for j in range(update_every):
batch = replay_buffer.sample_batch(batch_size)
update(data=batch, logger_tensor = logger_tensor, t = t)
# End of epoch handling
if (t + 1) % steps_per_epoch == 0:
epoch = (t + 1) // steps_per_epoch
# Save model
if (epoch % save_freq == 0) or (epoch == epochs):
logger.save_state({'env': env}, None)
# Test the performance of the deterministic version of the agent.
test_agent()
# Log info about epoch
logger.log_tabular('Epoch', epoch)
logger.log_tabular('EpRet', with_min_and_max=True)
logger.log_tabular('TestEpRet', with_min_and_max=True)
logger.log_tabular('EpLen', average_only=True)
logger.log_tabular('TestEpLen', average_only=True)
logger.log_tabular('TotalEnvInteracts', t)
logger.log_tabular('Q1Vals', with_min_and_max=True)
logger.log_tabular('Q2Vals', with_min_and_max=True)
logger.log_tabular('LogPi', with_min_and_max=True)
logger.log_tabular('LossPi', average_only=True)
logger.log_tabular('LossQ', average_only=True)
logger.log_tabular('Time', time.time() - start_time)
logger_tensor.log_value(t, epoch, "epoch")
logger.dump_tabular(logger_tensor=logger_tensor,epoch = epoch)
ac.save(args.save_model_dir, args.model_name)
