def evaluate(self, state, details=False):
"""
The evaluate function returns a value representing the utility function of the board.
"""
# TODO necessity to make eval fucnction symmetric ??
is_end = SeegaRules.is_end_game(state)
captured = state.score[self.ME] - state.score[self.OTHER]
other_is_stuck = state.phase == 2 and SeegaRules.is_player_stuck(
state, self.OTHER)
control_center = state.board.get_cell_color((2, 2)) == self.color
# weights of liner interpolation of heuristics
w_end = 100 * (-1 if captured < 0 else (0 if captured == 0 else 1))
w_capt = 1
w_stuck = 1
w_center = 0.6
random = .001 * np.random.random(
) # random is to avoid always taking the first move when there is a draw
if not details:
return w_capt * captured + \
w_stuck * (1 if other_is_stuck else 0) + \
w_end * (1 if is_end else 0) + \
w_center * (1 if control_center else 0) + \
random
else:
return {
'captured': captured,
'other_is_stuck': other_is_stuck,
'is_end': is_end,
'control_center': control_center
}
def make_self_play_move(self, state, fallback_function):
for action, s in self.successors(state):
if SeegaRules.is_player_stuck(s, self.OTHER):
print(" - SELF PLAY MOVE FOUND")
return action
print(" - NO SELF PLAY MOVE FOUND, CONTINUE")
self.repeat_boring_moves = False
return fallback_function(state)
def is_player_stuck(state, player_id):
return SeegaRules.is_player_stuck(state, player_id)