code: def test(self, verify_fn):
      num_epochs = 5
      num_outputs = num_epochs * self._num_files * self._num_records
      verify_fn(
          self, lambda: self._build_dataset(num_epochs), num_outputs
      )
  
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 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 2 for calling the FixedLengthRecordDatasetCheckpointTest obj's underlying member method code with example usage: obj.test(verify_fn) without return types