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arXiv 2602.00897math.NAcs.NA
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一种新的预条件梯度下降法与向量外推技术相结合用于非线性最小二乘问题的方法

A New Combination of Preconditioned Gradient Descent Methods and Vector Extrapolation Techniques for Nonlinear Least-Squares Problems

Mohammed VI Polytechnic University(穆罕默德六世理工大学);University of Littoral Côte d’Opale(加来海峡沿岸大学)

Abdellatif Mouhssine

AI总结:

本文提出一种结合预条件梯度下降法与向量外推技术的框架,用于提升非线性最小二乘问题的收敛速度和解精度。

摘要:

向量外推方法在大规模模拟研究中被广泛使用,已经开发出许多基于外推的加速技术,以提高线性和非线性固定点迭代方法的收敛性。尽管经典的外推策略通常减少迭代次数或计算成本,但并不一定导致计算近似值的精度显著提高。在本文中,我们研究了预条件梯度法与外推策略的结合,并提出了一种外推加速框架,同时提高收敛性和近似精度。重点是通过将向量外推技术与预条件梯度下降法相结合来解决非线性最小二乘问题。进行了全面的数值实验,研究多项式型外推方法与向量ε-算法在与梯度下降方案结合时的行为,包括有无预条件的情况。结果展示了外推技术对收敛速度和解精度的影响,并报告了迭代次数、计算时间和相对重建误差。通过基于广义Krylov子空间的Gauss-Newton方法基准研究,进一步评估了所提出混合方法的性能。

英文摘要:

Vector extrapolation methods are widely used in large-scale simulation studies, and numerous extrapolation-based acceleration techniques have been developed to enhance the convergence of linear and nonlinear fixed-point iterative methods. While classical extrapolation strategies often reduce the number of iterations or the computational cost, they do not necessarily lead to a significant improvement in the accuracy of the computed approximations. In this paper, we study the combination of preconditioned gradient-based methods with extrapolation strategies and propose an extrapolation-accelerated framework that simultaneously improves convergence and approximation accuracy. The focus is on the solution of nonlinear least-squares problems through the integration of vector extrapolation techniques with preconditioned gradient descent methods. A comprehensive set of numerical experiments is carried out to study the behavior of polynomial-type extrapolation methods and the vector $\varepsilon$-algorithm when coupled with gradient descent schemes, with and without preconditioning. The results demonstrate the impact of extrapolation techniques on both convergence rate and solution accuracy, and report iteration counts, computational times, and relative reconstruction errors. The performance of the proposed hybrid approaches is further assessed through a benchmarking study against Gauss--Newton methods based on generalized Krylov subspaces.

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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