def _create_board(self):
self._board = np.array([[None] * self.dim for _ in range(self.dim)])
multinomial_sample = np.random.multinomial(self.dim**2, [1 / 4] * 4,
size=1)
for i in range(self.dim):
for j in range(self.dim):
sample = np.random.randint(0, 4)
while multinomial_sample[0, sample] == 0:
sample = np.random.randint(0, 4)
multinomial_sample[0, sample] -= 1
self._board[i, j] = Terrain.generate_from_index(sample)
