arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1503.06883math.OC
收藏

网络Optimization的快速精确二阶方法

Fast, Accurate Second Order Methods for Network Optimization

Rasul Tutunov, Haitham Bou Ammar, Ali Jadbabaie

摘要:

对偶下降法通常用于解决网络流最优化问题,因为它们的实现可以分布在网络上。然而,这些算法通常表现出缓慢的收敛速度。局部计算下降方向的近似牛顿方法已经被提出作为加速传统对偶下降的收敛速度的替代方案。这些方法的有效性受到这种近似的准确性的限制。本文提出一种求解网络流问题的高效、精确的分布式二阶方法。该方法利用对偶Hessian的稀疏模式,使用一种新的对称对角占优线性方程的分布式求解器来近似牛顿方向。我们的求解器基于Spielman和Peng(2014)最近并行求解器的分布式实现。我们分析了所提出的算法的性质,并表明,类似于传统的牛顿法,超线性收敛的邻域内的最优值。最后,我们证明了该方法的有效性在一组随机生成的网络上的实验。

英文摘要:

Dual descent methods are commonly used to solve network flow optimization problems, since their implementation can be distributed over the network. These algorithms, however, often exhibit slow convergence rates. Approximate Newton methods which compute descent directions locally have been proposed as alternatives to accelerate the convergence rates of conventional dual descent. The effectiveness of these methods, is limited by the accuracy of such approximations. In this paper, we propose an efficient and accurate distributed second order method for network flow problems. The proposed approach utilizes the sparsity pattern of the dual Hessian to approximate the the Newton direction using a novel distributed solver for symmetric diagonally dominant linear equations. Our solver is based on a distributed implementation of a recent parallel solver of Spielman and Peng (2014). We analyze the properties of the proposed algorithm and show that, similar to conventional Newton methods, superlinear convergence within a neighbor- hood of the optimal value is attained. We finally demonstrate the effectiveness of the approach in a set of experiments on randomly generated networks.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑