code: def tearDown(self):
      shutil.rmtree(self.tmp_dir)
  
imports: import numpy
  import os
  import shutil
  import tempfile
  import unittest
  from chainer import testing
  from chainercv.datasets import directory_parsing_label_names
  from chainercv.datasets import DirectoryParsingLabelDataset
  from chainercv.utils import assert_is_label_dataset
  from chainercv.utils import write_image
label_desc: Use image node_id 2 for calling the TestNumericalSortDirectoryParsingLabelDataset obj's underlying member method code with example usage: obj.tearDown() without return types