https://blog.csdn.net/momo19901210/article/details/107950001?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param
https://blog.csdn.net/zhouzhenyong/article/details/106412812?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.channel_param
https://zhuanlan.zhihu.com/p/152179727?utm_source=com.tencent.mtt ---9种生成方式
https://www.cnblogs.com/zhaoshujie/p/12010052.html ----net 版本