code: def testBasic(self):
      with self.cached_session():
          counts = {}
          seed = 0
          for i in range(50):
              sample = self.evaluate(
                  clustering_ops.kmc2_chain_initialization(
                      self._distances, seed + i
                  )
              )
              counts[sample] = counts.get(sample, 0) + 1
          self.assertEqual(len(counts), 2)
          self.assertTrue(500 in counts)
          self.assertTrue(1000 in counts)
          self.assertGreaterEqual(counts[500], 5)
          self.assertGreaterEqual(counts[1000], 5)
  
imports: import numpy
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import clustering_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 2 for calling the KMC2InitializationLargeTest obj's underlying member method code with example usage: obj.testBasic() without return types