code: def tearDown(self):
      if hasattr(self, "cached_files"):
          for file in self.cached_files:
              if os.path.exists(file):
                  os.remove(file)
  
file_path: chainer/tests/chainer_tests/datasets_tests/test_svhn.py
imports: import os
  import unittest
  import mock
  import numpy
  from chainer.dataset import download
  from chainer.datasets import get_svhn
  from chainer.datasets import tuple_dataset
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 2 for calling the TestSvhn obj's underlying member method code with example usage: obj.tearDown() without return types