code: def testOptimization(self):
      dataset = dataset_ops.Dataset.range(10)
      dataset = dataset.apply(testing.assert_next(["MemoryCacheImpl"]))
      dataset = dataset.skip(0)  # this should be optimized away
      dataset = dataset.cache()
  
      options = options_lib.Options()
      options.experimental_optimization.noop_elimination = True
      dataset = dataset.with_options(options)
  
      multi_device_iterator = (
          multi_device_iterator_ops.MultiDeviceIterator(
              dataset, [self._devices[1], self._devices[2]]
          )
      )
  
      self.evaluate(multi_device_iterator.initializer)
      for i in range(0, 10, 2):
          elem_on_1, elem_on_2 = multi_device_iterator.get_next()
          self.assertEqual(i, self.evaluate(elem_on_1))
          self.assertEqual(i + 1, self.evaluate(elem_on_2))
      with self.assertRaises(errors.OutOfRangeError):
          elem_on_1, elem_on_2 = multi_device_iterator.get_next()
          self.evaluate(elem_on_1)
          self.evaluate(elem_on_2)
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.data.experimental.ops import testing
  from tensorflow.python.data.kernel_tests import test_base
  from tensorflow.python.data.ops import dataset_ops
  from tensorflow.python.data.ops import from_generator_op
  from tensorflow.python.data.ops import multi_device_iterator_ops
  from tensorflow.python.data.ops import options
  from tensorflow.python.eager import cancellation
  from tensorflow.python.eager import context
  from tensorflow.python.eager import def_function
  from tensorflow.python.eager import executor
  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 tensor_spec
  from tensorflow.python.ops import data_flow_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 11 for calling the MultiDeviceIteratorTest obj's underlying member method code with example usage: obj.testOptimization() without return types