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arXiv 1610.08697math.OC
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带记忆的邻近原始-对偶最佳逼近算法

Proximal primal-dual best approximation algorithm with memory

Ewa M. Bednarczuk, Anna Jezierska, Krzysztof E. Rutkowski

摘要:

提出了一种新的修正的原始-对偶近似最佳逼近方法来求解凸的不一定可微的最优化问题。该方法的新颖性依赖于通过考虑在定义当前时间的公式中的先前步骤中计算的迭代来引入内存。为此,我们考虑投影到当前以及以前的迭代的基础上产生的半空间的交叉点。为了计算这些投影,我们使用最近获得的多面体集上的投影机的封闭形式的表达式。所得到的算法具有记忆,继承了原来的最佳逼近近原始对偶法的强收敛性。此外,我们比较我们的算法与原始(非惯性)的帮助下,所谓的吸引力属性定义如下。图像重建问题的大量数值实验结果表明,包括内存到原始算法的优点。

英文摘要:

We propose a new modified primal-dual proximal best approximation method for solving convex not necessarily differentiable optimization problems. The novelty of the method relies on introducing memory by taking into account iterates computed in previous steps in the formulas defining current iterate. To this end we consider projections onto intersections of halfspaces generated on the basis of the current as well as the previous iterates. To calculate these projections we are using recently obtained closed-form expressions for projectors onto polyhedral sets. The resulting algorithm with memory inherits strong convergence properties of the original best approximation proximal primal-dual algorithm. Additionally, we compare our algorithm with the original (non-inertial) one with the help of the so called attraction property defined below. Extensive numerical experimental results on image reconstruction problems illustrate the advantages of including memory into the original algorithm.

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