def get_sqd_from_center(boardsize):
"""
plane `position mask` from
Yuandong Tian, Yan Zhu, 2015
Better Computer Go Player with Neural Network and Long-term Prediction
(arXiv:1511.06410)
"""
assert boardsize % 2 == 1
center = boardsize // 2
return distances_from_pt(sq_distance, (center, center), boardsize)
def get_gridcular_from_center(boardsize):
assert boardsize % 2 == 1
center = boardsize // 2
return distances_from_pt(gridcular_distance, (center, center), boardsize)
def get_l2_from_center(boardsize):
assert boardsize % 2 == 1
center = boardsize // 2
return distances_from_pt(l2_distance, (center, center), boardsize)
