message: Update prefetching_ops.py
diff: @@ -70,8 +70,12 @@ def copy_to_device(target_device, source_device="/cpu:0"):
  """
  def _apply_fn(dataset):
  + options = dataset_ops.Options()
  + options.experimental_optimization.apply_default_optimizations = False
  + options.experimental_optimization.autotune = False
  return _CopyToDeviceDataset(
  dataset, target_device=target_device,
  + source_device=source_device).with_options(options)
  source_device=source_device)
  return _apply_fn
  