code: def testTimeseriesToyProblemNoInputs(self):
      problem = timeseries.TimeseriesToyProblemNoInputs()
      problem.generate_data(self.tmp_dir, self.tmp_dir)
  
      dataset = problem.dataset(
          tf_estimator.ModeKeys.TRAIN, self.tmp_dir
      )
      features = dataset.make_one_shot_iterator().get_next()
  
      examples = []
      exhausted = False
      with self.test_session() as sess:
          examples.append(sess.run(features))
          examples.append(sess.run(features))
          examples.append(sess.run(features))
          examples.append(sess.run(features))
          examples.append(sess.run(features))
  
          try:
              sess.run(features)
          except tf.errors.OutOfRangeError:
              exhausted = True
  
      self.assertTrue(exhausted)
      self.assertEqual(5, len(examples))
  
file_path: tensor2tensor/tensor2tensor/data_generators/timeseries_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import shutil
  from tensor2tensor.data_generators import timeseries
  import tensorflow.compat.v1
  from tensorflow.compat.v1 import estimator
label_desc: Use image node_id 3 for calling the TimeseriesTest obj's underlying member method code with example usage: obj.testTimeseriesToyProblemNoInputs() without return types