def test_ppo_compilation_and_schedule_mixins(self):
"""Test whether a PPOTrainer can be built with all frameworks."""
# Build a PPOConfig object.
config = (
ppo.PPOConfig().training(
num_sgd_iter=2,
# Setup lr schedule for testing.
lr_schedule=[[0, 5e-5], [128, 0.0]],
# Set entropy_coeff to a faulty value to proof that it'll get
# overridden by the schedule below (which is expected).
entropy_coeff=100.0,
entropy_coeff_schedule=[[0, 0.1], [256, 0.0]],
).rollouts(
num_rollout_workers=1,
# Test with compression.
compress_observations=True,
).training(
train_batch_size=128,
model=dict(
# Settings in case we use an LSTM.
lstm_cell_size=10,
max_seq_len=20,
),
).callbacks(MyCallbacks)) # For checking lr-schedule correctness.
num_iterations = 2
for fw in framework_iterator(config, with_eager_tracing=True):
for env in ["FrozenLake-v1", "MsPacmanNoFrameskip-v4"]:
print("Env={}".format(env))
for lstm in [True, False]:
print("LSTM={}".format(lstm))
config.training(model=dict(
use_lstm=lstm,
lstm_use_prev_action=lstm,
lstm_use_prev_reward=lstm,
))
trainer = config.build(env=env)
policy = trainer.get_policy()
entropy_coeff = trainer.get_policy().entropy_coeff
lr = policy.cur_lr
if fw == "tf":
entropy_coeff, lr = policy.get_session().run(
[entropy_coeff, lr])
check(entropy_coeff, 0.1)
check(lr, config.lr)
for i in range(num_iterations):
results = trainer.train()
check_train_results(results)
print(results)
check_compute_single_action(
trainer,
include_prev_action_reward=True,
include_state=lstm)
trainer.stop()
def test_ppo_free_log_std(self):
"""Tests the free log std option works."""
config = (ppo.PPOConfig().rollouts(num_rollout_workers=0, ).training(
gamma=0.99,
model=dict(
fcnet_hiddens=[10],
fcnet_activation="linear",
free_log_std=True,
vf_share_layers=True,
),
))
for fw, sess in framework_iterator(config, session=True):
trainer = ppo.PPOTrainer(config=config, env="CartPole-v0")
policy = trainer.get_policy()
# Check the free log std var is created.
if fw == "torch":
matching = [
v for (n, v) in policy.model.named_parameters()
if "log_std" in n
]
else:
matching = [
v for v in policy.model.trainable_variables()
if "log_std" in str(v)
]
assert len(matching) == 1, matching
log_std_var = matching[0]
def get_value():
if fw == "tf":
return policy.get_session().run(log_std_var)[0]
elif fw == "torch":
return log_std_var.detach().cpu().numpy()[0]
else:
return log_std_var.numpy()[0]
# Check the variable is initially zero.
init_std = get_value()
assert init_std == 0.0, init_std
batch = compute_gae_for_sample_batch(policy, FAKE_BATCH.copy())
if fw == "torch":
batch = policy._lazy_tensor_dict(batch)
policy.learn_on_batch(batch)
# Check the variable is updated.
post_std = get_value()
assert post_std != 0.0, post_std
trainer.stop()
def test_ppo_exploration_setup(self):
"""Tests, whether PPO runs with different exploration setups."""
config = (
ppo.PPOConfig().environment(env_config={
"is_slippery": False,
"map_name": "4x4"
}, ).rollouts(
# Run locally.
num_rollout_workers=0, ))
obs = np.array(0)
# Test against all frameworks.
for fw in framework_iterator(config):
# Default Agent should be setup with StochasticSampling.
trainer = ppo.PPOTrainer(config=config, env="FrozenLake-v1")
# explore=False, always expect the same (deterministic) action.
a_ = trainer.compute_single_action(obs,
explore=False,
prev_action=np.array(2),
prev_reward=np.array(1.0))
# Test whether this is really the argmax action over the logits.
if fw != "tf":
last_out = trainer.get_policy().model.last_output()
if fw == "torch":
check(a_, np.argmax(last_out.detach().cpu().numpy(), 1)[0])
else:
check(a_, np.argmax(last_out.numpy(), 1)[0])
for _ in range(50):
a = trainer.compute_single_action(
obs,
explore=False,
prev_action=np.array(2),
prev_reward=np.array(1.0),
)
check(a, a_)
# With explore=True (default), expect stochastic actions.
actions = []
for _ in range(300):
actions.append(
trainer.compute_single_action(obs,
prev_action=np.array(2),
prev_reward=np.array(1.0)))
check(np.mean(actions), 1.5, atol=0.2)
trainer.stop()
def test_ppo_loss_function(self):
"""Tests the PPO loss function math."""
config = (ppo.PPOConfig().rollouts(num_rollout_workers=0, ).training(
gamma=0.99,
model=dict(
fcnet_hiddens=[10],
fcnet_activation="linear",
vf_share_layers=True,
),
))
for fw, sess in framework_iterator(config, session=True):
trainer = ppo.PPOTrainer(config=config, env="CartPole-v0")
policy = trainer.get_policy()
# Check no free log std var by default.
if fw == "torch":
matching = [
v for (n, v) in policy.model.named_parameters()
if "log_std" in n
]
else:
matching = [
v for v in policy.model.trainable_variables()
if "log_std" in str(v)
]
assert len(matching) == 0, matching
# Post-process (calculate simple (non-GAE) advantages) and attach
# to train_batch dict.
# A = [0.99^2 * 0.5 + 0.99 * -1.0 + 1.0, 0.99 * 0.5 - 1.0, 0.5] =
# [0.50005, -0.505, 0.5]
train_batch = compute_gae_for_sample_batch(policy,
FAKE_BATCH.copy())
if fw == "torch":
train_batch = policy._lazy_tensor_dict(train_batch)
# Check Advantage values.
check(train_batch[Postprocessing.VALUE_TARGETS],
[0.50005, -0.505, 0.5])
# Calculate actual PPO loss.
if fw in ["tf2", "tfe"]:
ppo_surrogate_loss_tf(policy, policy.model, Categorical,
train_batch)
elif fw == "torch":
PPOTorchPolicy.loss(policy, policy.model, policy.dist_class,
train_batch)
vars = (policy.model.variables()
if fw != "torch" else list(policy.model.parameters()))
if fw == "tf":
vars = policy.get_session().run(vars)
expected_shared_out = fc(
train_batch[SampleBatch.CUR_OBS],
vars[0 if fw != "torch" else 2],
vars[1 if fw != "torch" else 3],
framework=fw,
)
expected_logits = fc(
expected_shared_out,
vars[2 if fw != "torch" else 0],
vars[3 if fw != "torch" else 1],
framework=fw,
)
expected_value_outs = fc(expected_shared_out,
vars[4],
vars[5],
framework=fw)
kl, entropy, pg_loss, vf_loss, overall_loss = self._ppo_loss_helper(
policy,
policy.model,
Categorical if fw != "torch" else TorchCategorical,
train_batch,
expected_logits,
expected_value_outs,
sess=sess,
)
if sess:
policy_sess = policy.get_session()
k, e, pl, v, tl = policy_sess.run(
[
policy._mean_kl_loss,
policy._mean_entropy,
policy._mean_policy_loss,
policy._mean_vf_loss,
policy._total_loss,
],
feed_dict=policy._get_loss_inputs_dict(train_batch,
shuffle=False),
)
check(k, kl)
check(e, entropy)
check(pl, np.mean(-pg_loss))
check(v, np.mean(vf_loss), decimals=4)
check(tl, overall_loss, decimals=4)
elif fw == "torch":
check(policy.model.tower_stats["mean_kl_loss"], kl)
check(policy.model.tower_stats["mean_entropy"], entropy)
check(policy.model.tower_stats["mean_policy_loss"],
np.mean(-pg_loss))
check(
policy.model.tower_stats["mean_vf_loss"],
np.mean(vf_loss),
decimals=4,
)
check(policy.model.tower_stats["total_loss"],
overall_loss,
decimals=4)
else:
check(policy._mean_kl_loss, kl)
check(policy._mean_entropy, entropy)
check(policy._mean_policy_loss, np.mean(-pg_loss))
check(policy._mean_vf_loss, np.mean(vf_loss), decimals=4)
check(policy._total_loss, overall_loss, decimals=4)
trainer.stop()
