in swd.py [0:0]
def generate_grid_point():
x_min, x_max = x_s[:, 0].min() - .5, x_s[:, 0].max() + 0.5
y_min, y_max = x_s[:, 1].min() - .5, x_s[:, 1].max() + 0.5
xx, yy = np.meshgrid(np.arange(x_min, x_max, 0.01), np.arange(y_min, y_max, 0.01))
return xx, yy