message: Revise `utils` to `np_utils`.
diff: @@ -561,7 +561,7 @@ def _reduce(tf_fn,
  # TODO (DarrenZhang01): Add `axis` support to the `size` API.
  -@utils.np_doc('size')
  +@np_utils.np_doc('size')
  def size(x, axis=None): # pylint: disable=missing-docstring
  if axis is not None:
  raise NotImplementedError("axis argument is not supported in the current "
  