https://github.com/golbin/TensorFlow-Tutorials
https://github.com/golbin/TensorFlow-Tutorials/blob/master/08%20-%20RNN/03%20-%20Seq2Seq.py
https://tensorflowkorea.gitbooks.io/tensorflow-kr/content/g3doc/tutorials/seq2seq/
https://www.tensorflow.org/tutorials/seq2seq
http://www.asimovinstitute.org/neural-network-zoo/
https://ratsgo.github.io/blog/categories/ NLP
http://jaejunyoo.blogspot.com/2017/06/anyone-can-learn-to-code-LSTM-RNN-Python.html LSTM-RNN
https://www.youtube.com/watch?v=X3dgB4f-kWA - 철희님 발표영상