code: def test_iterator_repeat(self):
      dataset = [1, 2, 3, 4, 5, 6]
      it = iterators.MultithreadIterator(dataset, 2, **self.options)
      for i in range(3):
          self.assertEqual(it.epoch, i)
          self.assertAlmostEqual(it.epoch_detail, i + 0 / 6)
          if i == 0:
              self.assertIsNone(it.previous_epoch_detail)
          else:
              self.assertAlmostEqual(
                  it.previous_epoch_detail, i - 2 / 6
              )
          batch1 = it.next()
          self.assertEqual(len(batch1), 2)
          self.assertIsInstance(batch1, list)
          self.assertFalse(it.is_new_epoch)
          self.assertAlmostEqual(it.epoch_detail, i + 2 / 6)
          self.assertAlmostEqual(it.previous_epoch_detail, i + 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, i + 4 / 6)
          self.assertAlmostEqual(it.previous_epoch_detail, i + 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, i + 6 / 6)
          self.assertAlmostEqual(it.previous_epoch_detail, i + 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 TestMultithreadIterator obj's underlying member method code with example usage: obj.test_iterator_repeat() without return types