def default(task, config):
defaults = dict(subsample=2,
frame_skip=4,
history=4,
delta=False,
frame_max=2,
noop_max=30)
config = mp.utility.use_attrdicts(mp.utility.merge_dicts(defaults, config))
policy = mp.Sequential(task)
policy.add(mp.step.Image)
if config.noop_max:
policy.add(mp.step.RandomStart, config.noop_max)
if config.frame_skip > 1:
policy.add(mp.step.Skip, config.frame_skip)
if config.frame_max:
policy.add(mp.step.Maximum, config.frame_max)
if config.history > 1:
channels = policy.above_task.observs.shape[-1]
policy.add(mp.step.Grayscale, (0.299, 0.587, 0.114)[:channels])
if config.subsample > 1:
sub = config.subsample
amount = (sub, sub) if config.history > 1 else (sub, sub, 1)
policy.add(mp.step.Subsample, amount)
if config.delta:
policy.add(mp.step.Delta)
if config.history > 1:
policy.add(mp.step.History, config.history)
policy.add(mp.step.Normalize)
policy.add(mp.step.ClampReward)
return policy
def train_policies(self):
heads = []
for _ in range(self.config.heads):
policy = mp.Sequential(self.task)
policy.add(self._create_preprocess())
policy.add(Head, self)
heads.append(policy)
return heads
def dqn_2015(task, config=None):
policy = mp.Sequential(task)
policy.add(mp.step.Image)
policy.add(mp.step.RandomStart, 30)
policy.add(mp.step.Skip, 4)
policy.add(mp.step.Maximum, 2)
policy.add(mp.step.Grayscale, (0.299, 0.587, 0.114))
policy.add(mp.step.Subsample, (2, 2))
policy.add(mp.step.History, 4)
policy.add(mp.step.Normalize)
policy.add(mp.step.ClampReward)
return policy
def train_policies(self):
trainers = []
for _ in range(self.config.learners):
config = mp.utility.AttrDict(self.config.copy())
# TODO: Use single model to share RMSProp statistics. Does RMSProp
# use statistics in compute_gradients() or apply_gradients()?
model = mp.model.Model(self._create_network, threads=1)
model.weights = self.model.weights
policy = mp.Sequential(self.task)
policy.add(self._create_preprocess())
policy.add(Train, config, self, model)
trainers.append(policy)
return trainers
def policy(self):
# TODO: Why doesn't self.task work here?
policy = mp.Sequential(self._preprocess.task)
policy.add(self._preprocess)
policy.add(self)
return policy
def _create_preprocess(self):
policy = mp.Sequential(self.task)
preprocess = getattr(mp.part.preprocess, self.config.preprocess)
policy.add(preprocess, self.config.preprocess_config)
policy.add(mp.step.EpsilonGreedy, **self.config.epsilon)
return policy
def _create_preprocess(self):
policy = mp.Sequential(self.task)
preprocess = getattr(mp.part.preprocess, self.config.preprocess)
policy.add(preprocess, self.config.preprocess_config)
return policy
def test_policy(self):
policy = mp.Sequential(self.task)
policy.add(self._preprocess)
policy.add(Test, self.model, self)
return policy
def _prepend_score_step(self, policy):
combined = mp.Sequential(policy.task)
combined.add(mp.step.Score)
combined.add(policy)
return combined