code: def _build_iterator_graph(
      self, test_filenames, compression_type=None
  ):
      return readers.TextLineDataset(
          test_filenames,
          compression_type=compression_type,
          buffer_size=10,
      )
  
imports: import gzip
  import os
  import pathlib
  import zlib
  from absl.testing import parameterized
  from tensorflow.python.data.kernel_tests import checkpoint_test_base
  from tensorflow.python.data.kernel_tests import test_base
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.data.ops import readers
  from tensorflow.python.framework import combinations
  from tensorflow.python.framework import errors
  from tensorflow.python.platform import test
  from tensorflow.python.util import compat
label_desc: Use image node_id 1 for calling the TextLineDatasetCheckpointTest obj's underlying member method code with example usage: obj._build_iterator_graph(test_filenames, compression_type) and returns: readers