docs: 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