code: def test_whiten(self):
      desired = np.array(
          [
              [5.08738849, 2.97091878],
              [3.19909255, 0.69660580],
              [4.51041982, 0.02640918],
              [4.38567074, 0.95120889],
              [2.32191480, 1.63195503],
          ]
      )
      for tp in np.array, matrix:
          obs = tp(
              [
                  [0.98744510, 0.82766775],
                  [0.62093317, 0.19406729],
                  [0.87545741, 0.00735733],
                  [0.85124403, 0.26499712],
                  [0.45067590, 0.45464607],
              ]
          )
          assert_allclose(whiten(obs), desired, rtol=1e-5)
  
imports: import warnings
  import sys
  import numpy
  from numpy.testing import assert_array_equal, assert_array_almost_equal, assert_allclose, assert_equal, assert_, suppress_warnings
  import pytest
  from pytest import raises
  from scipy.cluster.vq import kmeans, kmeans2, py_vq, vq, whiten, ClusterError, _krandinit
  from scipy.cluster import _vq
  from scipy.sparse.sputils import matrix
label_desc: Use image node_id 1 for calling the TestWhiten obj's underlying member method code with example usage: obj.test_whiten() without return types