def Imitation_Learning(self,
step_time,
data=None,
policy=None,
learning_start=1000,
buffer_size=5000,
value_training_round=10,
value_training_fre=2500,
verbose=2,
render=False):
'''
:param data: the data is a list, and each element is a dict with 5 keys s,a,r,s_,tr
sample = {"s": s, "a": a, "s_": s_, "r": r, "tr": done}
:param policy:
:return:
'''
if data is not None and policy is not None:
raise Exception(
"The IL only need one way to guide, Please make sure the input "
)
if data is not None:
for time in step_time:
self.step += 1
loss = self.backward(data[time])
if verbose == 1:
logger.record_tabular("steps", self.step)
logger.record_tabular("loss", loss)
logger.dumpkvs()
if policy is not None:
buffer = ReplayMemory(buffer_size)
s = self.env.reset()
loss_BC = 0
ep_step, ep_reward = 0, 0
for _ in range(step_time):
self.step += 1
ep_step += 1
a = policy(self.env)
s_, r, done, info = self.env.step(a)
ep_reward += r
if render:
self.env.render()
sample = {"s": s, "a": a, "s_": s_, "r": r, "tr": done}
buffer.push(sample)
s = s_[:]
if self.step > learning_start:
sample_ = buffer.sample(self.batch_size)
loss = self.policy_behavior_clone(sample_)
if self.step % value_training_fre == 0:
record_sample = {}
for key in buffer.memory.keys():
record_sample[key] = np.array(
buffer.memory[key]).astype(
np.float32)[-value_training_fre:]
record_sample["value"] = self.value.forward(
torch.from_numpy(record_sample["s"]))
returns, advants = get_gae(record_sample["r"],
record_sample["tr"],
record_sample["value"],
self.gamma, self.lam)
record_sample["advs"] = advants
record_sample["return"] = returns
for round_ in range(value_training_round):
loss_value = self.value_pretrain(
record_sample, value_training_fre)
print(round_, loss_value)
if verbose == 1:
logger.record_tabular("learning_steps", self.step)
logger.record_tabular("loss", loss)
logger.record_tabular("rewrad", r)
logger.dumpkvs()
loss_BC += loss
if done:
if verbose == 2:
logger.record_tabular("learning_steps", self.step)
logger.record_tabular("step_used", ep_step)
logger.record_tabular("loss", loss_BC / ep_step)
logger.record_tabular("ep_reward", ep_reward)
logger.dumpkvs()
s = self.env.reset()
loss_BC = 0
ep_step, ep_reward = 0, 0
def interact(self,
max_step=50000,
max_ep_cycle=2000,
train_rollout=10,
learning_start=1000,
render=False,
verbose=1,
record_ep_inter=None):
'''
:param max_step:
:param max_ep_time:
:param max_ep_cycle: max step in per circle
.........................show parameter..................................
:param verbose
if verbose == 1 show every ep
if verbose == 2 show every step
:param record_ep_inter
record_ep_interact data
:return: None
'''
# if IL_time is not None:
self.render = render
# .....................initially——recode...........................#
rollout = 0
now_best_reward = -np.inf
self.dist = make_pdtype(self.env.action_space, self.policy)
sample_generate = self.runner(self.sample_rollout, self.sample_ep,
max_ep_cycle, record_ep_inter)
while self.step < max_step:
sample = next(sample_generate)
returns, advants = get_gae(sample["buffer"]["r"],
sample["buffer"]["tr"],
sample["buffer"]["value"], self.gamma,
self.lam)
# record_sample = gae(sample["buffer"], sample["last_Q"], self.gamma, self.lam)
record_sample = sample["buffer"]
record_sample["advs"] = advants.unsqueeze(1)
record_sample["return"] = returns.unsqueeze(1)
rollout += 1
if self.step > learning_start and self.learning:
ep_show = {}
if self.backward_ep_show_list:
for key in self.backward_ep_show_list:
ep_show[key] = 0
rollout_loss = 0
for time in range(train_rollout):
loss, other_infor = self.update(record_sample)
if verbose == 1:
logger.record_tabular("1.train_rollout", time)
logger.record_tabular("2.loss", loss)
flag = 3
if self.backward_step_show_list:
for key in self.backward_step_show_list:
logger.record_tabular(
str(flag) + "." + key, other_infor[key])
flag += 1
logger.dump_tabular()
rollout_loss += loss
if self.backward_ep_show_list:
for key in self.backward_ep_show_list:
ep_show[key] += other_infor[key]
if verbose == 2:
logger.record_tabular("01.steps", self.step)
logger.record_tabular("02.episodes", self.episode)
logger.record_tabular("03.rollouts/num", rollout)
logger.record_tabular("04.rollouts/mean_episode_reward",
np.mean(sample["ep_reward"]))
logger.record_tabular(
"05.rollouts/mean_step_reward",
torch.mean(
sample["buffer"]["r"]).cpu().detach().numpy())
logger.record_tabular("06.rollouts/loss", rollout_loss)
logger.record_tabular(
"07.rollouts/episode_Q_value",
torch.mean(torch.tensor(
sample["ep_Q_value"])).cpu().detach().numpy())
# logger.record_tabular("05.episode_loss_per_step", rollout_loss / samole["step_used"])
# logger.record_tabular("06.episode_Q_value", sample["ep_Q_value"])
# logger.record_tabular("07.episode_Q_value_per_ep", np.mean(sample["ep_Q_value"]))
logger.record_tabular("08.mean_ep_step_used",
np.mean(sample["ep_step_used"]))
flag = 10
if self.backward_ep_show_list:
for key in self.backward_ep_show_list:
logger.record_tabular(
str(flag) + "." + key, ep_show[key])
flag += 1
logger.dump_tabular()
if np.mean(sample["ep_reward"]) > now_best_reward:
self.save_weights(self.path)
print("the best mean ep reward is ",
np.mean(sample["ep_reward"]), "the weight is saved")
now_best_reward = np.mean(sample["ep_reward"])
def update(self, sample):
returns, advants = get_gae(sample["r"], sample["tr"], sample["value"],
self.gamma, self.lam)
sample["advs"] = advants.unsqueeze(1)
sample["return"] = returns.unsqueeze(1)
sample["cost"] = []
for info in sample["info"]:
sample["cost"].append(info["cost"])
sample["cost_value"] = self.cost_value.forward(sample["s"])
returns, advants = get_gae(sample["cost"], sample["tr"],
sample["cost_value"], self.gamma, self.lam)
sample["cost_advs"] = advants.unsqueeze(1)
sample["cost_return"] = returns.unsqueeze(1)
step_len = len(sample["s"])
if self.lstm_enable:
flagin = [
time for time in range(step_len) if sample["tr"][time] == 1
]
time_round = len(flagin)
array_index = []
for train_time in range(int(time_round) - 1):
array_index.append(
range(flagin[train_time], flagin[train_time + 1]))
else:
time_round = np.ceil(step_len / self.batch_size)
time_left = time_round * self.batch_size - step_len
array = list(range(step_len)) + list(range(int(time_left)))
array_index = []
for train_time in range(int(time_round)):
array_index.append(
array[train_time * self.batch_size:(train_time + 1) *
self.batch_size])
loss_re, pgloss_re, enloss_re, vfloss_re = [], [], [], []
for key in sample.keys():
temp = torch.stack(list(sample[key]), 0)
if self.gpu:
sample[key] = temp.cuda()
else:
sample[key] = temp
for train_time in range(int(time_round)):
index = array_index[train_time]
# for index in range(step_len):
training_s = sample["s"][index].detach()
training_a = sample["a"][index].detach()
training_r = sample["r"][index].detach()
R = sample["return"][index].detach()
old_value = sample["value"][index].detach()
old_neglogp = sample["logp"][index].detach()
advs = sample["advs"][index].detach()
c_advs = sample["cost_advs"][index].detach()
c_value = sample["cost_value"][index].detach()
cost = sample["cost"][index].detach()
" CALCULATE THE LOSS"
" Total loss = Policy gradient loss - entropy * entropy coefficient + Value coefficient * value loss"
" the value loss"
value_now = self.value.forward(training_s)
# value loss
value_clip = old_value + torch.clamp(
old_value - value_now, min=-self.cliprange,
max=self.cliprange) # Clipped value
vf_loss1 = self.loss_cal(value_now, R) # Unclipped loss
vf_loss2 = self.loss_cal(value_clip, R) # clipped loss
vf_loss = .5 * torch.max(vf_loss1, vf_loss2)
# generate Policy gradient loss
outcome = self.policy.forward(training_s)
new_policy = self.dist(outcome)
new_neg_lop = new_policy.log_prob(training_a)
ratio = torch.exp(new_neg_lop - old_neglogp)
pg_loss1 = -advs * ratio
pg_loss2 = -advs * torch.clamp(ratio, 1.0 - self.cliprange,
1.0 + self.cliprange)
pg_loss = .5 * torch.max(pg_loss1, pg_loss2).mean()
# generate Policy gradient loss
c_pg_loss1 = -c_advs * ratio
c_pg_loss2 = -c_advs * torch.clamp(ratio, 1.0 - self.cliprange,
1.0 + self.cliprange)
c_pg_loss = .5 * torch.max(c_pg_loss1, c_pg_loss2).mean()
# entropy
entropy = new_policy.entropy().mean()
loss = pg_loss - self.ui * c_pg_loss - entropy * self.ent_coef + vf_loss * self.vf_coef
self.policy_model_optim.zero_grad()
pg_loss.backward()
self.policy_model_optim.step()
for _ in range(self.value_train_step):
value_now = self.value.forward(training_s)
# value loss
value_clip = old_value + torch.clamp(
old_value - value_now,
min=-self.cliprange,
max=self.cliprange) # Clipped value
vf_loss1 = self.loss_cal(value_now, R) # Unclipped loss
vf_loss2 = self.loss_cal(value_clip, R) # clipped loss
vf_loss = .5 * torch.max(vf_loss1, vf_loss2)
self.value_model_optim.zero_grad()
vf_loss1.backward()
self.value_model_optim.step()
cost_now = self.cost_value.forward(training_s)
cost_vloss = self.loss_cal(cost_now, cost)
self.cost_value_model_optim.zero_grad()
cost_vloss.backward()
self.cost_value_model_optim.step()
loss_re = loss.cpu().detach().numpy()
pgloss_re.append(pg_loss.cpu().detach().numpy())
enloss_re.append(entropy.cpu().detach().numpy())
vfloss_re.append(vf_loss1.cpu().detach().numpy())
"training the weights ui"
for i in sample["cost"]:
cost = self.ui * sample["cost"]
self.ui_optim.zero_grad()
cost.backward()
self.ui_optim.step()
return np.sum(loss_re), {
"pg_loss": np.sum(pgloss_re),
"entropy": np.sum(enloss_re),
"vf_loss": np.sum(vfloss_re)
}