message: Explicitly states that 'experimental' is experimental :-)
diff: @@ -38,6 +38,9 @@ patch versions. The public APIs consist of
  `tensorflow` module and its submodules, except for
  * functions and classes in `tf.contrib`
  * functions and classes whose names start with `_` (as these are private)
  + * functions, arguments, properties and classes whose name starts with
  + `experimental`, or whose fully qualified name includes a module called
  + `experimental`
  Note that the code in the `examples/` and `tools/` directories is not
  reachable through the `tensorflow` Python module and is thus not covered by
  the compatibility guarantee.
  