message: [tf.data] Actually add `tf.contrib.data.get_single_element()` to the public API.
diff: @@ -32,6 +32,7 @@ See the @{$datasets$Importing Data} Programmer's Guide for an overview.
  @@rejection_resample
  @@sloppy_interleave
  +@@get_single_element
  """
  from __future__ import absolute_import
  @@ -44,6 +45,7 @@ from tensorflow.contrib.data.python.ops.batching import batch_and_drop_remainder
  from tensorflow.contrib.data.python.ops.batching import dense_to_sparse_batch
  from tensorflow.contrib.data.python.ops.batching import unbatch
  from tensorflow.contrib.data.python.ops.dataset_ops import Dataset
  +from tensorflow.contrib.data.python.ops.dataset_ops import get_single_element
  from tensorflow.contrib.data.python.ops.enumerate_ops import enumerate_dataset
  from tensorflow.contrib.data.python.ops.error_ops import ignore_errors
  from tensorflow.contrib.data.python.ops.grouping import group_by_window
  