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arXiv 2303.12477math.OC
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连续随机梯度法:II部分--应用与数值

The Continuous Stochastic Gradient Method: Part II -- Application and Numerics

Max Grieshammer, Lukas Pflug, Michael Stingl, Andrian Uihlein

摘要:

在这篇文章中,我们提出了一个数值分析的连续随机梯度(CSG)方法,包括应用拓扑优化和收敛速度。与标准的随机梯度优化方案相比,CSG不丢弃来自先前迭代的旧梯度样本。相反,计算设计相关的积分权重以形成线性组合作为对当前设计处的真实梯度的近似。由于近似误差在迭代过程中消失,CSG代表了一种混合方法,开始时像一个纯粹的随机方法,并表现得像一个完整的梯度计划的限制。在这项工作中,CSG的效率证明了拓扑优化的实际相关应用。这些设置的特点是,大量的优化变量\textit{and}的目标函数,其评估需要数值计算的多重积分级联在一个非线性的方式。以往任何一种现有的最优化方法都无法解决这类问题。最后,关于收敛速度,第一估计提供和确认的帮助下,数值实验。

英文摘要:

In this contribution, we present a numerical analysis of the continuous stochastic gradient (CSG) method, including applications from topology optimization and convergence rates. In contrast to standard stochastic gradient optimization schemes, CSG does not discard old gradient samples from previous iterations. Instead, design dependent integration weights are calculated to form a linear combination as an approximation to the true gradient at the current design. As the approximation error vanishes in the course of the iterations, CSG represents a hybrid approach, starting off like a purely stochastic method and behaving like a full gradient scheme in the limit. In this work, the efficiency of CSG is demonstrated for practically relevant applications from topology optimization. These settings are characterized by both, a large number of optimization variables \textit{and} an objective function, whose evaluation requires the numerical computation of multiple integrals concatenated in a nonlinear fashion. Such problems could not be solved by any existing optimization method before. Lastly, with regards to convergence rates, first estimates are provided and confirmed with the help of numerical experiments.

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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