中文说明：最速下降法是一种沿着N维目标函数的负梯度方向搜索最小值的方法。该程序是用最速下降法求无约束最优化解。
English Description：
Steepest descent method is a method to search the minimum value along the negative gradient direction of n-dimensional objective function. The program is to use the steepest descent method to find the unconstrained optimal solution.