code: def test_elbow_simple_02_step_3(self):
      elbow_test_template.calculate_elbow(
          SIMPLE_SAMPLES.SAMPLE_SIMPLE2, None, 1, 10, True, kstep=3
      )
  
imports: import unittest
  import matplotlib
  from pyclustering.cluster.center_initializer import random_center_initializer
  from pyclustering.cluster.tests.elbow_template import elbow_test_template
  from pyclustering.samples.definitions import FCPS_SAMPLES, SIMPLE_SAMPLES, SIMPLE_ANSWERS
label_desc: Use image node_id 8 for calling the elbow_integration_test obj's underlying member method code with example usage: obj.test_elbow_simple_02_step_3() without return types