def chebyshev(x, y):
    """Chebyshev or l-infinity distance.

    ..math::
        D(x, y) = \max_i |x_i - y_i|
    """
    result = 0.0
    for i in range(x.shape[0]):
        result = max(result, np.abs(x[i] - y[i]))

    return result