code: def setUp(self):
      root = os.path.join(os.path.dirname(__file__), "image_dataset")
      path = os.path.join(root, "labeled_img.lst")
      self.dataset = datasets.LabeledImageDataset(
          path,
          root=root,
          dtype=self.dtype,
          label_dtype=self.label_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 TestLabeledImageDataset obj's underlying member method code with example usage: obj.setUp() without return types