code: def testPrefetchSparseTensorsToDevice(self):
      def make_tensor(i):
          return sparse_tensor.SparseTensorValue(
              indices=[[0, 0]], values=(i * [1]), dense_shape=[2, 2]
          )
  
      host_dataset = dataset_ops.Dataset.range(10).map(make_tensor)
  
      device_dataset = host_dataset.apply(
          prefetching_ops.prefetch_to_device("/cpu:1")
      )
  
      with ops.device("/cpu:1"):
          iterator = dataset_ops.make_one_shot_iterator(device_dataset)
          next_element = iterator.get_next()
  
      self.assertTrue(
          structure.are_compatible(
              dataset_ops.get_structure(host_dataset),
              dataset_ops.get_structure(device_dataset),
          )
      )
  
      self.assertEqual(dtypes.int64, next_element.dtype)
  
      worker_config = config_pb2.ConfigProto(device_count={"CPU": 2})
      with self.test_session(config=worker_config):
          for i in range(10):
              actual = self.evaluate(next_element)
              self.assertAllEqual([i], actual.values)
              self.assertAllEqual([[0, 0]], actual.indices)
              self.assertAllEqual([2, 2], actual.dense_shape)
          with self.assertRaises(errors.OutOfRangeError):
              self.evaluate(next_element)
  
imports: from absl.testing import parameterized
  from tensorflow.core.protobuf import config_pb2
  from tensorflow.python.data.experimental.ops import prefetching_ops
  from tensorflow.python.data.kernel_tests import test_base
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.data.util import structure
  from tensorflow.python.framework import combinations
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import sparse_tensor
  from tensorflow.python.framework import test_util
  from tensorflow.python.platform import test
label_desc: Use image node_id 4 for calling the PrefetchToDeviceTest obj's underlying member method code with example usage: obj.testPrefetchSparseTensorsToDevice() and returns: sparse_tensor