Understanding and promotion of weighted—LR: https://www.cnblogs.com/hellojamest/p/11871108.html
Vector inner product and outer product: https://www.cnblogs.com/gxcdream/p/7597865.html
Understanding and promotion of weighted—LR: https://www.cnblogs.com/hellojamest/p/11871108.html
Vector inner product and outer product: https://www.cnblogs.com/gxcdream/p/7597865.html