def select_move(self, game_state):
num_moves = self._encoder.board_width * self._encoder.board_height
move_probs = self.predict(game_state)
move_probs = move_probs[0].asnumpy()
# increase the distance between the move likely and least likely moves
move_probs = move_probs**3
# prevent move probs from getting stuck at 0 or 1
eps = 1e-6
move_probs = np.clip(move_probs, eps, 1 - eps)
# re-normalize to get another probability distribution
move_probs = move_probs / np.sum(move_probs)
# turn the probabilities into a ranked list of moves.
candidates = np.arange(num_moves)
# sample potential candidates
ranked_moves = np.random.choice(candidates,
num_moves,
replace=False,
p=move_probs)
for point_idx in ranked_moves:
point = self._encoder.decode_point_index(point_idx)
# starting from the top, find a valid move that doesn't reduce eye-space
if game_state.is_valid_move(Move.play(point)) and \
not is_point_an_eye(game_state.board, point, game_state.next_player):
return Move.play(point)
# if no legal and non-self-destructive moves are left, pass
return Move.pass_turn()
def select_move(bot_name):
content = request.json
board_size = content['board_size']
game_state = GameState.new_game(board_size)
# Replay the game up to this point.
for move in content['moves']:
if move == 'pass':
next_move = Move.pass_turn()
elif move == 'resign':
next_move = Move.resign()
else:
next_move = Move.play(point_from_coords(move))
game_state = game_state.apply_move(next_move)
bot_agent = bot_map[bot_name]
bot_move = bot_agent.select_move(game_state)
if bot_move.is_pass:
bot_move_str = 'pass'
elif bot_move.is_resign:
bot_move_str = 'resign'
else:
bot_move_str = coords_from_point(bot_move.point)
return jsonify({
'bot_move': bot_move_str,
'diagnostics': bot_agent.diagnostics()
})
def select_move(self, game_state):
if self._strategy.should_pass(game_state):
return Move.pass_turn()
elif self._strategy.should_resign(game_state):
return Move.resign()
else:
return self._agent.select_move(game_state)
def _encode_and_persist(self, sgf_p):
sgf = SGFGame.from_string(sgf_p.read_text())
## determine winner
#winner = sgf.get_winner()
#if winner is None:
# print('no winner: %s' % sgf_p.name)
# return
# determine the initial game state by applying all handicap stones
game_state, first_move_done = self._get_handicap(sgf)
label = []
data = []
# iterate over all moves in the SGF (game)
for item in sgf.main_sequence_iter():
color, move_tuple = item.get_move()
point = None
if color is not None:
if move_tuple is not None:
# get coordinates of this move
row, col = move_tuple
point = Point(row + 1, col + 1)
move = Move.play(point)
# allow only valid moves
if not game_state.is_valid_move(move):
print('invalid move: %s' % sgf_p.name)
return
else:
# pass
move = Move.pass_turn()
if first_move_done and point is not None:
# use only winner's moves
#if first_move_done and point is not None and winner == color:
# encode the current game state as feature
d = self.encoder.encode(game_state)
# next move is the label for the this feature
l = self.encoder.encode_point(point)
data.append(d)
label.append(l)
# apply move to board and proceed with next one
game_state = game_state.apply_move(move)
first_move_done = True
# create numpy compressed file
size = len(data)
if 0 == size:
print('empty: %s' % sgf_p.name)
return
assert len(label) == size, 'label with invalid size'
assert len(data) == size, 'data with invalid size'
npz_p = self.processed_p.joinpath('%s-%s-%d' % (self.encoder.name(), sgf_p.stem, size))
label = np.array(label, dtype=np.int)
data = np.array(data, dtype=np.int)
np.savez_compressed(str(npz_p), d=data, l=label)
def select_move(self, game_state):
# choose a random valid move that preserves our own eyes
candidates = []
for r in range(1, game_state.board.num_rows + 1):
for c in range(1, game_state.board.num_cols + 1):
candidate = Point(row=r, col=c)
if game_state.is_valid_move(Move.play(candidate)) and\
not is_point_an_eye(game_state.board,
candidate,
game_state.next_player):
candidates.append(candidate)
if not candidates:
return Move.pass_turn()
return Move.play(random.choice(candidates))
def select_move(self, game_state):
# choose a random valid move that preserves our own eyes
dim = (game_state.board.num_rows, game_state.board.num_cols)
if dim != self.dim:
self._update_cache(dim)
idx = np.arange(len(self.point_cache))
np.random.shuffle(idx)
for i in idx:
p = self.point_cache[i]
if game_state.is_valid_move(Move.play(p)) and \
not is_point_an_eye(game_state.board,
p,
game_state.next_player):
return Move.play(p)
return Move.pass_turn()
def _play_their_move(self):
their_name = self._their_color.name
their_letter = their_name[0].upper()
pos = self._command_and_response("genmove {}\n".format(their_name))
if pos.lower() == 'resign':
self._game_state = self._game_state.apply_move(Move.resign())
self._stopped = True
elif pos.lower() == 'pass':
self._game_state = self._game_state.apply_move(Move.pass_turn())
self._sgf.append(";{}[]\n".format(their_letter))
if self._game_state.last_move.is_pass:
self._stopped = True
else:
move = Move(gtp_position_to_coords(pos))
self._game_state = self._game_state.apply_move(move)
self._sgf.append(";{}[{}]\n".format(their_letter, self._sgf.coordinates(move)))