ref:

https://datascience.stackexchange.com/questions/8606/what-are-some-nice-algorithms-techniques-for-optimizing-and-predicting-click-thr

https://www.chrisstucchio.com/blog/2012/bandit_algorithms_vs_ab.html

http://geek.csdn.net/news/detail/195714

http://x-algo.cn/index.php/2016/12/15/ee-problem-and-bandit-algorithm-for-recommender-systems/ 推荐系统的EE问题及bandit算法