http://buptldy.github.io/2016/05/03/2016-05-03-%E4%BD%BF%E7%94%A8Caffe%E8%AE%AD%E7%BB%83%E5%A5%BD%E7%9A%84CaffeNet%E8%BF%9B%E8%A1%8C%E5%88%86%E7%B1%BB/ RNN学习找了好多资料，觉得这个最具体！ https://cs224d.stanford.edu/lecture_notes/LectureNotes4.pdf