code: def setUpClass(cls):
      tf.set_random_seed(1)
      cls.problem = registry.problem("test_problem")
      cls.data_dir = tempfile.gettempdir()
      cls.filepatterns = generate_test_data(cls.problem, cls.data_dir)
  
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 1 for calling the DataReaderTest obj's underlying member method code with example usage: obj.setUpClass(cls) without return types