arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2302.09128math.OC
收藏

一种在无公共随机数情况下的随机拟牛顿法

A Stochastic Quasi-Newton Method in the Absence of Common Random Numbers

Matt Menickelly, Stefan M. Wild, Miaolan Xie

AI总结:

本文针对无公共随机数的随机优化问题,提出一种基于SASS算法的通用拟牛顿法,推导了非凸与强凸情形下的高概率迭代复杂度界,并通过合成及量子化学实验验证了其经验优势。

摘要:

我们提出了一种用于无约束随机优化的拟牛顿法。该主题的现有文献大多假设一种随机优化设置,其中分量函数的有限和是对期望的合理近似,因此可以设计一种利用公共随机数的拟牛顿法。与之相反,受变分量子算法中问题的驱动,我们假设函数值和梯度只能通过不精确的概率性零阶和一阶预言机获得,且无法利用公共随机数。我们的算法框架基于先前关于SASS算法的工作,具有一般性,且不假设公共随机数的存在。我们推导了该算法在非凸和强凸函数上的迭代复杂度的高概率尾部界。我们给出了数值结果,证明了用我们的拟牛顿更新方案增强SASS的经验收益,无论是在合成问题上还是在量子化学的真实问题上。

英文摘要:

We present a quasi-Newton method for unconstrained stochastic optimization. Most existing literature on this topic assumes a setting of stochastic optimization in which a finite sum of component functions is a reasonable approximation of an expectation, and hence one can design a quasi-Newton method to exploit common random numbers. In contrast, and motivated by problems in variational quantum algorithms, we assume that function values and gradients are available only through inexact probabilistic zeroth- and first-order oracles and no common random numbers can be exploited. Our algorithmic framework -- based on prior work on the SASS algorithm -- is general and does not assume common random numbers. We derive a high-probability tail bound on the iteration complexity of the algorithm for nonconvex and strongly convex functions. We present numerical results demonstrating the empirical benefits of augmenting SASS with our quasi-Newton updating scheme, both on synthetic problems and on real problems in quantum chemistry.

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。

↑