code: def tearDownClass(cls):
      # Clean up files
      for fp in cls.filepatterns:
          files = tf.gfile.Glob(fp)
          for f in files:
              os.remove(f)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import tempfile
  import numpy
  from six.moves import range
  from tensor2tensor.data_generators import generator_utils
  from tensor2tensor.data_generators import problem
  from tensor2tensor.layers import modalities
  from tensor2tensor.utils import data_reader
  from tensor2tensor.utils import registry
  import tensorflow.compat.v1
  from tensorflow.compat.v1 import estimator
label_desc: Use image node_id 2 for calling the DataReaderTest obj's underlying member method code with example usage: obj.tearDownClass(cls) without return types