code: def __init__(self, return_values):
      self.iterator = iter(return_values)
      self.finalized = False
      self.return_values = return_values
  
imports: import unittest
  import numpy
  import chainer
  from chainer import backend
  from chainer.backends import _cpu
  from chainer import dataset
  from chainer import iterators
  from chainer import testing
  from chainer.training import extensions
label_desc: Use image node_id 1 to create a new DummyIterator object from inherited base classes: dataset with example: obj = DummyIterator(return_values)