class SelfPlayer(Process):
def __init__(self, config, sample_queue, model_queue):
super(SelfPlayer, self).__init__()
self.config = config
self.temp = config['temperature']
self.sample_queue = sample_queue
self.model_queue = model_queue
self.board = Board(width=config['board_width'],
height=config['board_height'],
n_in_row=config['n_in_row'])
self.game = Game(self.board)
def collect_selfplay_data(self, n_games=1):
"""collect self-play data for training"""
samples = []
for i in range(n_games):
_, play_data = self.game.start_self_play(self.mcts_player,
temp=self.temp)
samples.extend(list(play_data)[:])
return samples
def run(self):
self.policy_value_net = PolicyValueNet(
self.config['board_width'],
self.config['board_height'],
model_file=self.config['init_model'])
self.mcts_player = MCTSPlayer(self.policy_value_net.policy_value_fn,
c_puct=self.config['c_puct'],
n_playout=self.config['n_playout'],
is_selfplay=1)
print("running")
while True:
# always use the latest weight
weights = None
while not self.model_queue.empty():
weights = self.model_queue.get()
if weights:
self.policy_value_net.set_weight(weights)
# sample
samples = self.collect_selfplay_data()
# put the new sample to sample queue
self.sample_queue.put(samples)
class Evaluator(Process):
def __init__(self, config, weight_queue):
super(Evaluator, self).__init__()
self.config = config
self.queue = weight_queue
self.best_win_ratio = 0.0
self.pure_mcts_playout_num = self.config['pure_mcts_playout_num']
def run(self):
self.policy_value_net = PolicyValueNet(
self.config['board_width'],
self.config['board_height'],
model_file=self.config['init_model'])
while True:
weight = self.queue.get()
self.policy_value_net.set_weight(weight)
win_ratio = self.policy_evaluate()
self.policy_value_net.save_model(
self.config['current_policy_name'])
if win_ratio > self.best_win_ratio:
print("New best policy!!!!!!!!")
self.best_win_ratio = win_ratio
# update the best_policy
self.policy_value_net.save_model(
self.config['best_policy_name'])
if (self.best_win_ratio == 1.0
and self.pure_mcts_playout_num < 10000):
self.pure_mcts_playout_num += 1000
self.best_win_ratio = 0.0
def policy_evaluate(self, n_games=10):
"""
Evaluate the trained policy by playing against the pure MCTS player
Note: this is only for monitoring the progress of training
"""
self.evaluate_game = Game(
Board(width=self.config['board_width'],
height=self.config['board_height'],
n_in_row=self.config['n_in_row']))
current_mcts_player = MCTSPlayer(self.policy_value_net.policy_value_fn,
c_puct=self.config['c_puct'],
n_playout=self.config['n_playout'])
pure_mcts_player = MCTS_Pure(
c_puct=5, n_playout=self.config['pure_mcts_playout_num'])
win_cnt = defaultdict(int)
for i in range(n_games):
winner = self.evaluate_game.start_play(current_mcts_player,
pure_mcts_player,
start_player=i % 2,
is_shown=0)
win_cnt[winner] += 1
win_ratio = 1.0 * (win_cnt[1] + 0.5 * win_cnt[-1]) / n_games
print("num_playouts:{}, win: {}, lose: {}, tie:{}".format(
self.config['pure_mcts_playout_num'], win_cnt[1], win_cnt[2],
win_cnt[-1]))
return win_ratio
