漫谈四种神经网络序列解码模型[http://jacoxu.com/?p=1852]
requirements=Keras[https://github.com/fchollet/keras], Seq2Seq[https://github.com/farizrahman4u/seq2seq]
NOTE:
The suggested version of Keras is 0.3.3 or 0.3.2 rather than 1.0.0 and the lasted version, for some old style functions are called in seq2seq.