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gather.py
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gather.py
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import numpy as np
from agent import PPOAgent
from policy import get_policy
import utils
import environments
class GatheringWorker:
def __init__(self, idx, env_producer, rollout_size,
worker_queue, weights_queue):
self.env_name = env_producer.get_env_name()
self.config = environments.get_config(self.env_name)
self.session = None
self.idx = idx
self.env_producer = env_producer
self.env = None
self.s0 = None
self.trainable_vars = None
self.agent = None
self.cur_hidden_state = None
self.episode = None
self.episodes = []
self.batch_size = self.config["batch_size"]
self.terminal = False
self.recurrent_policy = self.config["recurrent"]
self.timestep_size = self.config["timestep_size"]
if not self.recurrent_policy:
self.timestep_size = 1
self.discount_factor = self.config["discount_factor"]
self.gae_factor = self.config["gae_factor"]
self.rollout_size = rollout_size
self.ep_count = 0
self.episode_step = 0
self.cum_rew = 0
self.global_step = 0
self.sampled_action = None
self.sampled_a_prob = None
self.accum_vars = None
self.assign_op = None
self.env_opts = None
self.worker_queue = worker_queue
self.weights_queue = weights_queue
self.stats = []
self.get_experience()
def get_experience(self):
self.init()
action, a_prob, h_out, v_out = self.agent.get_sample(self.s0, self.cur_hidden_state)
self.sampled_action = action
self.sampled_a_prob = a_prob
while True:
self.stats = []
self.apply_weights()
self.episodes = []
for i in range(self.rollout_size):
if self.terminal:
if self.episode_step == self.env_opts["max_episode_steps"] and len(self.episode[1]) > 0:
self.episode[4][-1] = False
self.episode_step = 0
self.s0 = self.env.reset()
self.episodes.append(self.episode)
self.cur_hidden_state = self.agent.get_init_hidden_state()
self.episode = [self.s0], [], [], [], [], [self.cur_hidden_state], []
self.stats.append({
"reward": self.cum_rew,
"step": self.ep_count,
"a_probs": self.sampled_a_prob,
"picked_a": self.sampled_action,
"a_dim": self.env_opts["action_dim"],
"discrete": self.env_opts["discrete"]
})
self.terminal = False
self.ep_count += 1
self.cum_rew = 0
action, a_prob, h_out, v_out = self.agent.get_sample(self.s0, self.cur_hidden_state)
self.episode_step += 1
self.global_step += 1
if np.random.random() > 0.99:
self.sampled_action = action
self.sampled_a_prob = a_prob
self.cur_hidden_state = h_out
self.s0, r, self.terminal, _ = self.env.step(action)
self.cum_rew += r
self.episode[0].append(self.s0)
self.episode[1].append(self.agent.transform_reward(r))
self.episode[2].append(action)
self.episode[3].append(a_prob)
self.episode[4].append(self.terminal)
self.episode[5].append(h_out)
self.episode[6].append(v_out)
self.episodes.append(self.episode)
self.episode = [self.s0], [], [], [], [], [self.cur_hidden_state], []
result = self.process_episodes(self.episodes)
self.worker_queue.put(result)
def apply_weights(self):
weights = self.weights_queue.get()
feed_dict = {}
for i, t in enumerate(self.accum_vars):
feed_dict[t] = weights[i]
self.session.run(self.assign_op, feed_dict=feed_dict)
def init(self):
import tensorflow as tf
self.env_opts = environments.get_env_options(self.env_name, self.env_producer.get_use_gpu())
self.env = self.env_producer.get_new_environment()
self.s0 = self.env.reset()
self.session = utils.create_session(self.env_opts, False)
with tf.device("/cpu:0"):
with tf.variable_scope("gather-%s" % self.idx):
pol = get_policy(self.env_opts, self.session)
self.agent = PPOAgent(pol, self.session, "gather-%s" % self.idx, self.env_opts)
self.trainable_vars = tf.get_collection(tf.GraphKeys.TRAINABLE_VARIABLES, "gather-%s" % self.idx)
self.accum_vars = [tf.Variable(tf.zeros_like(tv.initialized_value()), trainable=False) for tv in
self.trainable_vars]
assign_ops = [self.trainable_vars[i].assign(self.accum_vars[i]) for i in
range(len(self.trainable_vars))]
self.assign_op = tf.group(assign_ops)
self.session.run(tf.global_variables_initializer())
self.cur_hidden_state = self.agent.get_init_hidden_state()
self.episode = [self.s0], [], [], [], [], [self.cur_hidden_state], []
def process_episodes(self, episodes):
all_states = []
all_advantages = []
all_returns = []
all_picked_actions = []
all_old_actions_probs = []
all_pred_values = []
all_hidden_states = []
for episode in episodes:
st, rewards, picked_actions, old_action_probs, terminals, hidden_states, values = episode
if len(rewards) == 0:
continue
states = np.asarray(st)
pred_values = np.zeros(len(values) + 1)
pred_values[:-1] = np.array(values)
episode_len = len(rewards)
advantages = np.zeros((episode_len,))
returns = np.zeros((episode_len + 1,))
if terminals[-1]:
pred_values[-1] = 0
else:
_, _, _, v_out = self.agent.get_sample(states[-1], hidden_states[-1])
pred_values[-1] = v_out
returns[-1] = pred_values[-1]
for i in reversed(range(episode_len)):
r = rewards[i]
next_v = pred_values[i + 1]
cur_v = pred_values[i]
diff = r + self.discount_factor * next_v - cur_v
if i == episode_len - 1:
advantages[i] = diff
else:
advantages[i] = diff + self.discount_factor * self.gae_factor * advantages[i + 1]
returns[i] = r + self.discount_factor * returns[i + 1]
returns = returns[:-1]
ep_states = states[:-1]
ep_advantages = advantages
ep_returns = returns
ep_picked_actions = np.array(picked_actions)
ep_old_action_probs = np.array(old_action_probs)
ep_all_pred_values = pred_values
ep_hidden_state = np.array(hidden_states[:-1])
splitted = utils.split_episode(ep_states, ep_advantages, ep_returns, ep_picked_actions, ep_old_action_probs,
ep_all_pred_values, ep_hidden_state, self.timestep_size)
for b_states, b_hidden_state, b_advantages, b_returns, b_picked_actions, b_old_action_probs, b_all_pred_values in splitted:
all_states.append(b_states)
all_advantages.append(b_advantages)
all_returns.append(b_returns)
all_picked_actions.append(b_picked_actions)
all_old_actions_probs.append(b_old_action_probs)
all_pred_values.append(b_all_pred_values)
all_hidden_states.append(b_hidden_state)
all_states = np.array(all_states)
all_advantages = np.array(all_advantages)
all_picked_actions = np.array(all_picked_actions)
all_returns = np.array(all_returns)
all_old_actions_probs = np.array(all_old_actions_probs)
all_pred_values = np.array(all_pred_values)
all_hidden_states = np.array(all_hidden_states)
return [
all_states,
all_advantages,
all_picked_actions,
all_returns,
all_old_actions_probs,
all_pred_values,
all_hidden_states,
self.ep_count,
self.stats,
self.idx
]