code: def test(self, verify_fn, symbolic_checkpoint):
      num_outputs = 9
      array = np.tile(np.array([[16], [17], [18], [19], [20]]), 15)
      options = options_lib.Options()
      options.experimental_symbolic_checkpoint = symbolic_checkpoint
      verify_fn(
          self,
          lambda: self._build_concatenate_dataset(array, options),
          num_outputs,
      )
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.data.experimental.ops import random_access
  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 options
  from tensorflow.python.data.util import nest
  from tensorflow.python.framework import combinations
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import tensor_shape
  from tensorflow.python.platform import test
label_desc: Use image node_id 2 for calling the ConcatenateCheckpointTest obj's underlying member method code with example usage: obj.test(verify_fn, symbolic_checkpoint) without return types