message: Documented tf.keras.preprocessing purpose
diff: # See the License for the specific language governing permissions and
  # limitations under the License.
  # ==============================================================================
  -"""Keras data preprocessing utils."""
  +"""Provides keras data preprocessing utils to pre-process tf.data.Datasets before they are fed to the model."""
  # pylint: disable=g-import-not-at-top
  from __future__ import absolute_import
  from __future__ import division
  