*   Expose `tf.distribute.Strategy as the new name for
        tf.contrib.distribute.DistributionStrategy.
    *   Migrate linear optimizer from contrib to core.
    *   Move `tf.contrib.signal` to `tf.signal` (preserving aliases in
        tf.contrib.signal).
    *   Users of `tf.contrib.estimator.export_all_saved_models` and related
        should switch to
        `tf.estimator.Estimator.experimental_export_all_saved_models`.
*   tf.data:

  let description = [{
Computes the inverse 1-dimensional discrete Fourier transform of a real-valued
signal over the inner-most dimension of `input`.

The inner-most dimension of `input` is assumed to be the result of `RFFT`: the
`fft_length / 2 + 1` unique components of the DFT of a real-valued signal. If
`fft_length` is not provided, it is computed from the size of the inner-most

...

                  If this slice is full, implementations MUST NOT add further entries.
                  Instead they MUST consider the policy unimplementable and signal that
                  on any related resources such as the ancestor that would be referenced
                  here. For example, if this list was full on BackendTLSPolicy, no