Reference

http://cs224d.stanford.edu/lectures/CS224d-Lecture8.pdf http://cs.stanford.edu/people/karpathy/deepimagesent/ http://www.wildml.com/2015/09/recurrent-neural-networks-tutorial-part-1-introduction-to-rnns/ http://www.wildml.com/2015/09/recurrent-neural-networks-tutorial-part-2-implementing-a-language-model-rnn-with-python-numpy-and-theano/ http://karpathy.github.io/2015/05/21/rnn-effectiveness/ http://colah.github.io/posts/2015-08-Understanding-LSTMs/