code: def test_iterator_serialize(self):
      dataset = [1, 2, 3, 4, 5, 6]
      it = iterators.MultithreadIterator(dataset, 2, **self.options)
  
      self.assertEqual(it.epoch, 0)
      self.assertAlmostEqual(it.epoch_detail, 0 / 6)
      self.assertIsNone(it.previous_epoch_detail)
      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)
      self.assertAlmostEqual(it.previous_epoch_detail, 0 / 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)
      self.assertAlmostEqual(it.previous_epoch_detail, 2 / 6)
  
      target = dict()
      it.serialize(serializers.DictionarySerializer(target))
  
      it = iterators.MultithreadIterator(dataset, 2, **self.options)
      it.serialize(serializers.NpzDeserializer(target))
      self.assertFalse(it.is_new_epoch)
      self.assertAlmostEqual(it.epoch_detail, 4 / 6)
      self.assertAlmostEqual(it.previous_epoch_detail, 2 / 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)
      self.assertAlmostEqual(it.previous_epoch_detail, 4 / 6)
  
imports: from __future__ import division
  import copy
  import unittest
  import numpy
  import six
  from chainer import iterators
  from chainer import serializers
  from chainer import testing
label_desc: Use image node_id 2 for calling the TestMultithreadIteratorSerialize obj's underlying member method code with example usage: obj.test_iterator_serialize() without return types