http://www.hankcs.com/nlp/part-of-speech-tagging.html
https://www.cnblogs.com/eastmount/p/5055906.html
https://blog.csdn.net/linzch3/article/details/71253541
https://www.jianshu.com/p/dbaa4421b4ce
https://www.cnblogs.com/xiaoyh/p/9919590.html
https://blog.csdn.net/wangsiji_buaa/article/details/80264045
https://www.cnblogs.com/eastmount/p/5055906.html
http://www.php.cn/python-tutorials-392625.html