in data/gen_data_collisions.py [0:0]
def check_bounds(self, z, max_H=None, max_W=None):
max_H = max_H or self.grid_size
max_W = max_W or self.grid_size
return z[0] > 0 and z[0] < max_H - 1 and z[1] > 0 and z[1] < max_W - 1