There is already a seq2seq in the tree under contrib, is this one different from/replacing it?<p><a href="https://github.com/tensorflow/tensorflow/tree/master/tensorflow/contrib/seq2seq" rel="nofollow">https://github.com/tensorflow/tensorflow/tree/master/tensorf...</a>
To someone not active in the Tensorflow community, it is really not obvious what this is for. What are typical use cases? Why does the world need this?