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arXiv 2410.08033math.OCcs.SYeess.SY
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基于静态(Quiescence)的二阶优化

Second-Order Optimization via Quiescence

Aayushya Agarwal, Larry Pileggi, Ronald Rohrer

AI总结:

针对非凸优化中二阶方法步长受限的问题,提出基于静态的二阶优化方法,通过ODE建模与准稳态追踪实现大步长收敛,在电力系统非凸问题上优于现有前沿二阶方法。

摘要:

二阶优化方法能够快速收敛到临界点,但在非凸优化中,这类方法通常需要严格限制步长以保证目标函数单调递减。当目标函数高度非线性且具有较大Lipschitz常数时,步长会变得越来越小,成为快速收敛的瓶颈。我们提出一种二阶优化方法,利用动态系统模型将优化变量的轨迹表示为常微分方程(ODE)。随后,我们通过迫使上升时间最快的变量进入一种被称为quiescence(静态)的状态,来追踪准稳态轨迹。这种基于静态的优化方法能够自适应选择大步长,依次引导每个优化变量达到准稳态,直到所有状态变量都到达与最优点重合的实际稳态。最终得到的二阶方法可使用大步长,且无需目标函数单调递减即可抵达临界点。实验中,我们在电力系统非凸问题优化上验证了该方法的快速收敛性,并将其与现有前沿二阶方法进行了对比,包括damped Newton-Raphson(阻尼牛顿-拉夫逊法)、BFGS和SR1。

英文摘要:

Second-order optimization methods exhibit fast convergence to critical points, however, in nonconvex optimization, these methods often require restrictive step-sizes to ensure a monotonically decreasing objective function. In the presence of highly nonlinear objective functions with large Lipschitz constants, increasingly small step-sizes become a bottleneck to fast convergence. We propose a second-order optimization method that utilizes a dynamic system model to represent the trajectory of optimization variables as an ODE. We then follow the quasi-steady state trajectory by forcing variables with the fastest rise time into a state known as quiescence. This optimization via quiescence allows us to adaptively select large step-sizes that sequentially follow each optimization variable to a quasi-steady state until all state variables reach the actual steady state, coinciding with the optimum. The result is a second-order method that utilizes large step-sizes and does not require a monotonically decreasing objective function to reach a critical point. Experimentally, we demonstrate the fast convergence of this approach for optimizing nonconvex problems in power systems and compare them to existing state-of-the-art second-order methods, including damped Newton-Raphson, BFGS, and SR1.

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。

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