工程数学学报
工程數學學報
공정수학학보
CHINESE JOURNAL OF ENGINEERING MATHEMATICS
2014年
6期
837-846
,共10页
无约束优化%谱共轭梯度法%全局收敛%数值试验
無約束優化%譜共軛梯度法%全跼收斂%數值試驗
무약속우화%보공액제도법%전국수렴%수치시험
unconstrained optimization%spectral conjugate gradient method%global conver-gence%numerical experiment
谱共轭梯度法含有两个方向调控参数,是求解无约束优化问题的一类有效方法。本文给出一对参数公式以构建新的谱共轭梯度法,该方法在精确线搜索下与标准FR方法等价,在Wolfe线搜索下具有类似标准DY方法的内在性质。我们证明了采用Wolfe线搜索的新算法在每一次迭代中均产生下降方向,并且具有全局收敛性。数值实验结果表明,新算法数值稳定、有效,适合于求解大规模无约束优化问题。
譜共軛梯度法含有兩箇方嚮調控參數,是求解無約束優化問題的一類有效方法。本文給齣一對參數公式以構建新的譜共軛梯度法,該方法在精確線搜索下與標準FR方法等價,在Wolfe線搜索下具有類似標準DY方法的內在性質。我們證明瞭採用Wolfe線搜索的新算法在每一次迭代中均產生下降方嚮,併且具有全跼收斂性。數值實驗結果錶明,新算法數值穩定、有效,適閤于求解大規模無約束優化問題。
보공액제도법함유량개방향조공삼수,시구해무약속우화문제적일류유효방법。본문급출일대삼수공식이구건신적보공액제도법,해방법재정학선수색하여표준FR방법등개,재Wolfe선수색하구유유사표준DY방법적내재성질。아문증명료채용Wolfe선수색적신산법재매일차질대중균산생하강방향,병차구유전국수렴성。수치실험결과표명,신산법수치은정、유효,괄합우구해대규모무약속우화문제。
Spectral conjugate gradient method contains two parameters for direction control, and it is a class of effective algorithms for unconstrained optimization problems. This paper presents a pair of formulas to create a new spectral conjugate gradient method, which is equiv-alent to the standard FR method when the line search is exact, and its intrinsic properties are similar to the standard DY method with Wolfe line search. The descent in each iteration and the global convergence of the new algorithm under Wolfe line search are proved. Preliminary numerical results show that the new algorithm is robust, effective and suitable for solving large-scale unconstrained optimization problems.