一文搞懂HMM很清晰 https://www.cnblogs.com/fulcra/p/11065474.html HMM抓老千 https://blog.csdn.net/ppn029012/article/details/8923501 大师高德纳给年轻人建议 https://www.youtube.com/watch?v=75Ju0eM5T2c