https://www.kancloud.cn/bigheadyushan/learning_notes_of_advertising_algorithms/603686
https://zhuanlan.zhihu.com/p/72092504
https://blog.csdn.net/bigheadyushan/article/details/79133203
核心问题总共有五个,分别是模型算法,日志流、训练系统、特征系统跟评估。