code: def _build_iterator_graph(self, test_patterns):
      return matching_files.MatchingFilesDataset(test_patterns)
  
imports: import os
  import shutil
  import tempfile
  from absl.testing import parameterized
  from tensorflow.python.data.experimental.ops import matching_files
  from tensorflow.python.data.kernel_tests import checkpoint_test_base
  from tensorflow.python.data.kernel_tests import test_base
  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 MatchingFilesDatasetCheckpointTest obj's underlying member method code with example usage: obj._build_iterator_graph(test_patterns) and returns: matching_files