k = np.array([[6.5, 6.5], [3.5, 7.5], [7.5, 5.5], [7.5, 3.5], [1.5, 3.5], [
    1.5, 5.5], [7.5, 6.5], [3.5, 8.5], [6.5, 1.5], [6.5, 0.5]])
k = np.tile(k, (1000, 1))
Implementation of numpy in1d for 2D arrays?