def test_simple_dqn(self):
do_test_explorations(
simple_q.SimpleQ,
"CartPole-v0",
simple_q.SimpleQConfig().to_dict(),
np.array([0.0, 0.1, 0.0, 0.0]),
)
def test_simple_q_compilation(self):
"""Test whether a SimpleQTrainer can be built on all frameworks."""
# Run locally and with compression
config = simple_q.SimpleQConfig().rollouts(num_rollout_workers=0,
compress_observations=True)
num_iterations = 2
for _ in framework_iterator(config, with_eager_tracing=True):
trainer = config.build(env="CartPole-v0")
rw = trainer.workers.local_worker()
for i in range(num_iterations):
sb = rw.sample()
assert sb.count == config.rollout_fragment_length
results = trainer.train()
check_train_results(results)
print(results)
check_compute_single_action(trainer)
def test_simple_q_loss_function(self):
"""Tests the Simple-Q loss function results on all frameworks."""
config = simple_q.SimpleQConfig().rollouts(num_rollout_workers=0)
# Use very simple net (layer0=10 nodes, q-layer=2 nodes (2 actions)).
config.training(model={
"fcnet_hiddens": [10],
"fcnet_activation": "linear",
})
for fw in framework_iterator(config):
# Generate Trainer and get its default Policy object.
trainer = simple_q.SimpleQ(config=config, env="CartPole-v0")
policy = trainer.get_policy()
# Batch of size=2.
input_ = SampleBatch({
SampleBatch.CUR_OBS:
np.random.random(size=(2, 4)),
SampleBatch.ACTIONS:
np.array([0, 1]),
SampleBatch.REWARDS:
np.array([0.4, -1.23]),
SampleBatch.DONES:
np.array([False, False]),
SampleBatch.NEXT_OBS:
np.random.random(size=(2, 4)),
SampleBatch.EPS_ID:
np.array([1234, 1234]),
SampleBatch.AGENT_INDEX:
np.array([0, 0]),
SampleBatch.ACTION_LOGP:
np.array([-0.1, -0.1]),
SampleBatch.ACTION_DIST_INPUTS:
np.array([[0.1, 0.2], [-0.1, -0.2]]),
SampleBatch.ACTION_PROB:
np.array([0.1, 0.2]),
"q_values":
np.array([[0.1, 0.2], [0.2, 0.1]]),
})
# Get model vars for computing expected model outs (q-vals).
# 0=layer-kernel; 1=layer-bias; 2=q-val-kernel; 3=q-val-bias
vars = policy.get_weights()
if isinstance(vars, dict):
vars = list(vars.values())
vars_t = policy.target_model.variables()
if fw == "tf":
vars_t = policy.get_session().run(vars_t)
# Q(s,a) outputs.
q_t = np.sum(
one_hot(input_[SampleBatch.ACTIONS], 2) * fc(
fc(
input_[SampleBatch.CUR_OBS],
vars[0 if fw != "torch" else 2],
vars[1 if fw != "torch" else 3],
framework=fw,
),
vars[2 if fw != "torch" else 0],
vars[3 if fw != "torch" else 1],
framework=fw,
),
1,
)
# max[a'](Qtarget(s',a')) outputs.
q_target_tp1 = np.max(
fc(
fc(
input_[SampleBatch.NEXT_OBS],
vars_t[0 if fw != "torch" else 2],
vars_t[1 if fw != "torch" else 3],
framework=fw,
),
vars_t[2 if fw != "torch" else 0],
vars_t[3 if fw != "torch" else 1],
framework=fw,
),
1,
)
# TD-errors (Bellman equation).
td_error = q_t - config.gamma * input_[
SampleBatch.REWARDS] + q_target_tp1
# Huber/Square loss on TD-error.
expected_loss = huber_loss(td_error).mean()
if fw == "torch":
input_ = policy._lazy_tensor_dict(input_)
# Get actual out and compare.
if fw == "tf":
out = policy.get_session().run(
policy._loss,
feed_dict=policy._get_loss_inputs_dict(input_,
shuffle=False),
)
else:
out = (loss_torch if fw == "torch" else loss_tf)(policy,
policy.model,
None, input_)
check(out, expected_loss, decimals=1)
def _import_simple_q():
import ray.rllib.algorithms.simple_q as simple_q
return simple_q.SimpleQ, simple_q.SimpleQConfig().to_dict()