就像在高中用二次导数判断一维二次函数的凹凸流动一样，Hessian矩阵只不过是用于判断多维函数的某个特定点上的凹凸
(1) 3359 blog.csdn.net/as 122343/article/details/102256122
)2) 3359 www.cn blogs.com/mazhen/archive/2011/12/17/2290833.html
)3) 3359 blog.csdn.net/kking _ EDC/article/details/106363246？ UTM _ medium=distribute.PC _ relevant.none-task-blog-open search-2.control depth _1- UTM _ source=distristrid
)4) 3359 www.cn blogs.com/YY fighting/p/12500627.html