原生：
https://www.cnblogs.com/cxq1126/p/13504437.html
https://zhuanlan.zhihu.com/p/62486641
https://blog.csdn.net/qsmx666/article/details/107118550?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-1.control&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-1.control
https://www.jianshu.com/p/a064dd55f793
nn.MultiheadAttention:
https://blog.csdn.net/weixin_41811314/article/details/106804906?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-2.control&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromBaidu-2.control
https://pytorch.org/docs/stable/generated/torch.nn.MultiheadAttention.html#torch.nn.MultiheadAttention