code: def permute_outputs(Y, X):
      
      permutation_index = np.argsort(X)
      permutation_index = np.concatenate([permutation_index[::2],
                                          permutation_index[1::2][::-1]])
      return Y[permutation_index]
docs: Permute the output according to one of the inputs as in [_2]
  
      References
      ----------
      .. [2] Elmar Plischke (2010) "An effective algorithm for computing global
            sensitivity indices (EASI) Reliability Engineering & System Safety",
            95:4, 354-360. doi:10.1016/j.ress.2009.11.005