code: def testSaveCheckpointingAPICustomCheckpointInterval(self):
      dataset = dataset_ops.Dataset.range(40)
      step_counter = variables.Variable(0, trainable=False)
      checkpoint_args = {
          "checkpoint_interval": 5,
          "step_counter": step_counter,
          "directory": self._checkpoint_prefix,
          "max_to_keep": 10,
      }
      io.save(dataset, self._save_dir, checkpoint_args=checkpoint_args)
      num_checkpoint_files = len(
          list(os.listdir(self._checkpoint_prefix))
      )
      # We expect (2 * 8) + 1 files.
      self.assertEqual(17, num_checkpoint_files)
  
imports: import os
  import shutil
  from absl.testing import parameterized
  import numpy
  from tensorflow.python.data.experimental.ops import io
  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.eager import def_function
  from tensorflow.python.framework import combinations
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
label_desc: Use image node_id 2 for calling the SaveCheckpointTest obj's underlying member method code with example usage: obj.testSaveCheckpointingAPICustomCheckpointInterval() without return types