def play(network):
"""Plays out a self-play match, returning a MCTSPlayer object containing:
- the final position
- the n x 362 tensor of floats representing the mcts search probabilities
- the n-ary tensor of floats representing the original value-net estimate
where n is the number of moves in the game
"""
readouts = FLAGS.num_readouts # defined in strategies.py
# Disable resign in 5% of games
if random.random() < FLAGS.resign_disable_pct:
resign_threshold = -1.0
else:
resign_threshold = None
player = MCTSPlayer(network, resign_threshold=resign_threshold)
player.initialize_game()
# Must run this once at the start to expand the root node.
first_node = player.root.select_leaf()
prob, val = network.run(first_node.position)
first_node.incorporate_results(prob, val, first_node)
while True:
start = time.time()
player.root.inject_noise()
current_readouts = player.root.N
# we want to do "X additional readouts", rather than "up to X readouts".
while player.root.N < current_readouts + readouts:
player.tree_search()
if FLAGS.verbose >= 3:
print(player.root.position)
print(player.root.describe())
if player.should_resign():
player.set_result(-1 * player.root.position.to_play,
was_resign=True)
break
move = player.pick_move()
player.play_move(move)
if player.root.is_done():
player.set_result(player.root.position.result(), was_resign=False)
break
if (FLAGS.verbose >= 2) or (FLAGS.verbose >= 1 and player.root.position.n % 10 == 9):
print("Q: {:.5f}".format(player.root.Q))
dur = time.time() - start
print("%d: %d readouts, %.3f s/100. (%.2f sec)" % (
player.root.position.n, readouts, dur / readouts * 100.0, dur), flush=True)
if FLAGS.verbose >= 3:
print("Played >>",
coords.to_gtp(coords.from_flat(player.root.fmove)))
if FLAGS.verbose >= 2:
utils.dbg("%s: %.3f" % (player.result_string, player.root.Q))
utils.dbg(player.root.position, player.root.position.score())
return player
def test_extract_data_normal_end(self):
player = MCTSPlayer(DummyNet())
player.initialize_game()
player.tree_search()
player.play_move(None)
player.tree_search()
player.play_move(None)
self.assertTrue(player.root.is_done())
player.set_result(player.root.position.result(), was_resign=False)
data = list(player.extract_data())
self.assertEqual(2, len(data))
position, _, result = data[0]
# White wins by komi
self.assertEqual(go.WHITE, result)
self.assertEqual("W+{}".format(player.root.position.komi),
player.result_string)
def test_extract_data_resign_end(self):
player = MCTSPlayer(DummyNet())
player.initialize_game()
player.tree_search()
player.play_move((0, 0))
player.tree_search()
player.play_move(None)
player.tree_search()
# Black is winning on the board
self.assertEqual(go.BLACK, player.root.position.result())
# But if Black resigns
player.set_result(go.WHITE, was_resign=True)
data = list(player.extract_data())
position, _, result = data[0]
# Result should say White is the winner
self.assertEqual(go.WHITE, result)
self.assertEqual("W+R", player.result_string)
