9.23
Build github blog: https: //blog.csdn.net/AinUser/article/details/77609180
Regularization, ridge regression: https: //www.cnblogs.com/Belter/p/8536939.html
LinUCB: https://blog.csdn.net/livan1234/article/details/85078799
LinUCB thesis: https: //arxiv.org/pdf/1003.0146.pdf