code: def test_iterator_compatibilty(self):
      dataset = [1, 2, 3, 4, 5, 6]
  
      iters = (
          lambda: iterators.SerialIterator(dataset, 2),
          lambda: iterators.MultiprocessIterator(
              dataset, 2, **self.options
          ),
      )
  
      for it_before, it_after in itertools.permutations(iters, 2):
          it = it_before()
  
          self.assertEqual(it.epoch, 0)
          self.assertAlmostEqual(it.epoch_detail, 0 / 6)
          batch1 = it.next()
          self.assertEqual(len(batch1), 2)
          self.assertIsInstance(batch1, list)
          self.assertFalse(it.is_new_epoch)
          self.assertAlmostEqual(it.epoch_detail, 2 / 6)
          batch2 = it.next()
          self.assertEqual(len(batch2), 2)
          self.assertIsInstance(batch2, list)
          self.assertFalse(it.is_new_epoch)
          self.assertAlmostEqual(it.epoch_detail, 4 / 6)
  
          target = dict()
          it.serialize(serializers.DictionarySerializer(target))
  
          it = it_after()
          it.serialize(serializers.NpzDeserializer(target))
          self.assertFalse(it.is_new_epoch)
          self.assertAlmostEqual(it.epoch_detail, 4 / 6)
  
          batch3 = it.next()
          self.assertEqual(len(batch3), 2)
          self.assertIsInstance(batch3, list)
          self.assertTrue(it.is_new_epoch)
          self.assertEqual(sorted(batch1 + batch2 + batch3), dataset)
          self.assertAlmostEqual(it.epoch_detail, 6 / 6)
  
file_path: chainer/tests/chainer_tests/iterators_tests/test_iterator_compatibility.py
imports: from __future__ import division
  import itertools
  import unittest
  from chainer import iterators
  from chainer import serializers
  from chainer import testing
label_desc: Use image node_id 2 for calling the TestIteratorCompatibility obj's underlying member method code with example usage: obj.test_iterator_compatibilty() without return types