code: def check_retrieval_twice(self, name, retrieval_func):
      self.cached_file = os.path.join(self.root, name)
      train, test = retrieval_func(
          withlabel=self.withlabel, ndim=self.ndim, scale=self.scale
      )
  
      with mock.patch(
          "chainer.datasets.cifar.numpy", autospec=True
      ) as mnumpy:
          train, test = retrieval_func(
              withlabel=self.withlabel, ndim=self.ndim, scale=self.scale
          )
      mnumpy.savez_compressed.assert_not_called()  # creator() not called
      self.assertEqual(mnumpy.load.call_count, 1)
  
imports: import os
  import unittest
  import mock
  import numpy
  from chainer.dataset import download
  from chainer.datasets import get_cifar10
  from chainer.datasets import get_cifar100
  from chainer.datasets import tuple_dataset
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 8 for calling the TestCifar obj's underlying member method code with example usage: obj.check_retrieval_twice(name, retrieval_func) without return types