code: def test_incorrect_data(self):
      self.assertRaises(
          ValueError, gmeans, [], 1, False, tolerance=0.05, repeat=3
      )
  
imports: import unittest
  import matplotlib
  from pyclustering.cluster.tests.gmeans_templates import gmeans_test_template
  from pyclustering.cluster.gmeans import gmeans
  from pyclustering.utils import read_sample, distance_metric, type_metric
  from pyclustering.samples.definitions import SIMPLE_SAMPLES, FCPS_SAMPLES, SIMPLE_ANSWERS
label_desc: Use image node_id 32 for calling the gmeans_unit_test obj's underlying member method code with example usage: obj.test_incorrect_data() without return types