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 2602.21974math.NAcs.NA
收藏

子空间梯度下降法用于线性张量方程

Subspace gradient descent method for linear tensor equations

Alma Mater Studiorum Università di Bologna(博洛尼亚大学);IMATI-CNR(意大利国家研究委员会应用数学研究所)

Martina Iannacito, Lorenzo Piccinini, Valeria Simoncini

AI总结:

本文提出了一种用于求解线性张量方程的子空间梯度下降法,结合Tucker格式和混合精度策略,通过实验验证了其在三维偏微分方程求解中的有效性。

摘要:

代数张量方程的数值求解是一个广泛开放且具有挑战性的任务。假设算子是对称正定的,我们提出两种新的梯度下降类型方法用于张量方程,这些方法扩展了最近提出的子空间共轭梯度法(SS-CG),由D. Palitta等人在SIAM J. Matrix Analysis and Appl (2025)中提出。由于我们主要关注少量的张量模式,因此使用Tucker格式来高效表示低秩张量。此外,在某些子任务中采用混合精度策略以提高内存使用效率,并应用不同的预处理程序以增强收敛性。通过在具有分离系数的三维偏微分方程的张量导向离散化上的实验结果,展示了我们策略的潜力。与最先进的交替最小能量(AMEn)算法的比较证实了所提策略的竞争力。

英文摘要:

The numerical solution of algebraic tensor equations is a largely open and challenging task. Assuming that the operator is symmetric and positive definite, we propose two new gradient-descent type methods for tensor equations that generalize the recently proposed Subspace Conjugate Gradient (SS-CG), D. Palitta et al, SIAM J. Matrix Analysis and Appl (2025). As our interest is mainly in a modest number of tensor modes, the Tucker format is used to efficiently represent low-rank tensors. Moreover, mixed-precision strategies are employed in certain subtasks to improve the memory usage, and different preconditioners are applied to enhance convergence. The potential of our strategies is illustrated by experimental results on tensor-oriented discretizations of three-dimensional partial differential equations with separable coefficients. Comparisons with the state-of-the-art Alternating Minimal Energy (AMEn) algorithm confirm the competitiveness of the proposed strategies.

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。

↑