code: def _build_ds(self):
      return io.load(self._save_dir)
  
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 1 for calling the LoadCheckpointTest obj's underlying member method code with example usage: obj._build_ds() and returns: io