code: def testCoreInterfaceIntInputData(self):
      kmedians_instance = kmedians(
          [[1], [2], [3], [20], [21], [22]], [[2], [21]], ccore=True
      )
      kmedians_instance.process()
      assert len(kmedians_instance.get_clusters()) == 2
  
imports: import unittest
  import numpy
  import matplotlib
  from pyclustering.cluster.tests.kmedians_templates import KmediansTestTemplates
  from pyclustering.cluster.kmedians import kmedians
  from pyclustering.samples.definitions import SIMPLE_SAMPLES
  from pyclustering.core.tests import remove_library
  from pyclustering.utils import read_sample
  from pyclustering.utils.metric import type_metric, distance_metric
label_desc: Use image node_id 28 for calling the KmediansIntegrationTest obj's underlying member method code with example usage: obj.testCoreInterfaceIntInputData() without return types