code: def testText2SelfTxtIterator(self):
      targets = [
          entry["targets"]
          for entry in text_problems.text2self_txt_iterator(
              self.targets_file
          )
      ]
      self.assertEqual(targets, self.targets)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import shutil
  from tensor2tensor.data_generators import problem
  from tensor2tensor.data_generators import text_encoder
  from tensor2tensor.data_generators import text_problems
  import tensorflow.compat.v1
  from tensorflow.compat.v1 import estimator
label_desc: Use image node_id 4 for calling the TextProblems obj's underlying member method code with example usage: obj.testText2SelfTxtIterator() without return types