code: def test_kmeans2_rank1_2(self):
      data = TESTDATA_2D
      data1 = data[:, 0]
      kmeans2(data1, 2, iter=1)
  
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 6 for calling the TestKMean obj's underlying member method code with example usage: obj.test_kmeans2_rank1_2() without return types