*   The non-public `nn.rnn` and the various `nn.seq2seq` methods now return just
    the final state instead of the list of all states.
*   `tf.scatter_update` now no longer guarantees that lexicographically largest
    index be used for update when duplicate entries exist.
*   `tf.image.random_crop(image, [height, width])` is now `tf.random_crop(image,