code: def setUp(self):
      self.root = os.path.join(
          os.path.dirname(__file__), "text_dataset"
      )
  
imports: from __future__ import unicode_literals
  import os
  import pickle
  import unittest
  import six
  from chainer import datasets
  from chainer import testing
label_desc: Use image node_id 1 for calling the TestTextDataset obj's underlying member method code with example usage: obj.setUp() without return types