LSTM and GRU in JAVA ###Reference: Fig ref:https://github.com/dophist/kaldi-lstm A Note on BPTT for LSTM LM: http://www.slideshare.net/tmasada/a-note-on-bptt-for-lstm-lm Colah’s blog: http://colah.github.io/posts/2015-08-Understanding-LSTMs/