code: def setUp(self):
      root = os.path.join(os.path.dirname(__file__), "image_dataset")
      zipfilename = os.path.join(root, "zipped_images_1.zip")
      self.dataset = datasets.ZippedImageDataset(
          zipfilename, dtype=self.dtype
      )
  
imports: import os
  import pickle
  import unittest
  import numpy
  from chainer import datasets
  from chainer.datasets import image_dataset
  from chainer import testing
label_desc: Use image node_id 1 for calling the TestZippedImageDataset obj's underlying member method code with example usage: obj.setUp() without return types