自适应中的牛顿法。结论，当u靠近0.5时，wk 迅速增加到最佳权， 当u小于0.5时，wk 沿着一个方方向单向靠近最佳权；u大于0.5时wk沿着起始点指向最佳权的方向左右振荡并向最佳权收敛 ！ 已通过测试。

-Adaptive Newton method. Conclusion, when u is close to 0.5, wk rapidly increased to the optimal weight when u is less than 0.5, wk-way along a side direction close to the optimal weight　u is greater than 0.5 wk point along the starting point for the optimal weight about the direction of oscillation and the convergence of the optimal weight! Has been tested.