Method get_state

rl/tic_tac_toe.py:156–174

(self)

    return 1 if self.winner == sym else 0

  def get_state(self):
    # returns the current state, represented as an int
    # from 0...|S|-1, where S = set of all possible states
    # |S| = 3^(BOARD SIZE), since each cell can have 3 possible values - empty, x, o
    # some states are not possible, e.g. all cells are x, but we ignore that detail
    # this is like finding the integer represented by a base-3 number
    k = 0
    h = 0
    for i in range(LENGTH):
      for j in range(LENGTH):
        if self.board[i,j] == 0:
          v = 0
        elif self.board[i,j] == self.x:
          v = 1
        elif self.board[i,j] == self.o:
          v = 2
        h += (3**k) * v
        k += 1
    return h

  def game_over(self, force_recalculate=False):
    # returns true if game over (a player has won or it's a draw)