https://mp.weixin.qq.com/s/jprIK1MWAt6bzvg7WZGPwg
https://www.52nlp.cn/
https://www.cnblogs.com/pinard/p/6945257.html
https://www.yuque.com/books/share/f4031f65-70c1-4909-ba01-c47c31398466/dvgo5b
https://nbviewer.jupyter.org/github/fengdu78/lihang-code/tree/master/