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Jin-yanFan Wen-baoAi Qun-yingZhang 《计算数学(英文版)》2004,22(6):865-872
In this paper, we present a new line search and trust region algorithm for unconstrained optimization problem with the trust region radius converging to zero. The new trust region algorithm performs a backtracking line search from the failed, point instead of resolving the subproblem when the trial step results in an increase in the objective function. We show that the algorithm preserves the convergence properties of the traditional trust region algorithms. Numerical results are also given. 相似文献
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一类Dogleg路径信赖域方法 总被引:1,自引:0,他引:1
本文提出一类折线搜索的信赖域方法,用于解无约束最优化问题,这些方法通过对一般对称矩阵的Bunch-Parlett分解来产生搜索路径,我们证明在一些较弱的条件下,算法是整体收敛的,对一致凸函数,是二次收敛的,并且在由算法得到的点列的任意聚点上,连续可微的目标函数的Hesse阵都是正定或半正定的,一些数值结果表明这种新的方法是非常有效的。 相似文献
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本文对于无约束最优化问题提出了一个新的信赖域方法。在该算法中采用的是线性模型,并且当试探步不成功的时候,采用线性搜索,从而减少了计算量。文中证明了在适当的条件下算法的全局收敛性。 相似文献
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本文对线性不等式约束的非线性规划问题提出了一类信赖域算法,证明了算法所产生的序列的任一聚点为Kuhn-Tucker点,并讨论了子问题求解的有效集方法. 相似文献
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By means of a conjugate gradient strategy, we propose a trust region method for unconstrained optimization problems. The search direction is an adequate combination of the conjugate gradient direction and the trust-region direction. The global convergence and the quadratic convergence of this method are established under suitable conditions. Numerical results show that the presented method is competitive to the trust region method and the conjugate gradient method. 相似文献
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本文对等式约束问题提出了一个种组合信赖域与拟牛顿算法。该算法的特点是若Lagrangian函数的近似Hessian阵在等式约束Jacobi阵的零空间正定的,则选择拟牛顿算法,否则用信赖域算法,在通常信赖域算法的收敛假设下,该文证明了组合算法的全局收敛性。 相似文献
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提出了一种易实施的求无约束不可微规划的信赖域算法,并在一定条件下证明了该算法所产生的点列的任何聚点都是原问题的稳定点。 相似文献
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本文使用信赖域策略结合投影梯度算法来解约束优化问题,并给出算法及其收敛性。进一步,给出了收敛点具有满足约束问题一阶和二阶必要性的性质。 相似文献
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无约束最优化锥模型拟牛顿信赖域方法的收敛性(英) 总被引:3,自引:0,他引:3
本文研究无约束最优化雄模型拟牛顿信赖域方法的全局收敛性.文章给出了确保这类方法全局收敛的条件.文章还证明了,当用拆线法来求这类算法中锥模型信赖域子问题的近似解时,确保全局收敛的条件得到满足 相似文献
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Yigui Ou 《Numerical Functional Analysis & Optimization》2013,34(5):524-540
In this article, an ODE-based trust region filter algorithm for unconstrained optimization is proposed. It can be regarded as a combination of trust region and filter techniques with ODE-based methods. Unlike the existing trust-region-filter methods and ODE-based methods, a distinct feature of this method is that at each iteration, a reduced linear system is solved to obtain a trial step, thus avoiding solving a trust region subproblem. Under some standard assumptions, it is proven that the algorithm is globally convergent. Preliminary numerical results show that the new algorithm is efficient for large scale problems. 相似文献
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Matthias Steup 《Acta Analytica》2005,20(1):3-15
I distinguish between Old Contextualism, New Contextualism, and the Multiple Concepts Theory. I argue that Old Contextualism
cannot handle the following three problems: (i) the disquotational paradox, (ii) upward pressure resistance, (iii) inability
to avoid the acceptance of skeptical conclusions. New Contextualism, in contrast, can avoid these problems. However, since
New Contextualism appears to be a semanticized mirror image of MCT, it remains unclear whether it is in fact a genuine version
of contextualism. 相似文献
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欧宜贵 《数学物理学报(A辑)》2002,22(2):157-162
提出了一种易实施的求解带线性约束的非光滑优化问题的信赖域算法,并在一定的条件下证明了该算法所产生的迭代序列的任何聚点都是原问题的稳定点.有限的数值例子表明,该方法是行之有效的. 相似文献
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Milanka Gardasevic Filipovic Nada Djuranovic-Milicic 《Numerical Functional Analysis & Optimization》2013,34(12):1239-1251
In this article, we present a method for minimization of a nondifferentiable function. The method uses trust region strategy combined with a bundle method philosophy. It is proved that the sequence of points generated by the algorithm has an accumulation point that satisfies the first order necessary and sufficient conditions. 相似文献
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设计了一个新的求解等式约束优化问题的非单调信赖域算法.该算法不需要罚函数也无需滤子.在每次迭代过程中只需求解满足下降条件的拟法向步及切向步.新算法产生的迭代步比滤子方法更易接受,计算量比单调算法小.在一般条件下,算法具有全局收敛性. 相似文献