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arXiv 2211.03339math.NAcs.NA
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一种用于对称特征值问题的混合精度预条件雅可比方法

A mixed precision preconditioned Jacobi method for the symmetric eigenvalue problem

Zhiyuan Zhang, Zheng-Jian Bai

AI总结:

针对对称特征值问题,提出混合精度预条件雅可比方法,结合低精度特征分解与高精度正交化生成初始猜测,完成误差分析并拓展至奇异值问题,实验验证其效率优于原始雅可比方法。

摘要:

特征值问题是科学计算中的基础问题。本文首先对浮点运算下雅可比方法的单步或单次扫描过程进行了误差分析。随后我们提出了一种用于对称特征值问题的混合精度预条件雅可比方法:首先通过低精度特征求解器计算实对称矩阵的特征值分解,得到低精度的特征向量矩阵;接着采用高精度修正Gram-Schmidt正交化过程,得到高精度正交矩阵,将其作为雅可比方法的初始猜测值。我们在一定条件下建立了所提方法的舍入误差分析。本文还提出了一种用于奇异值问题的混合精度预条件单侧雅可比方法,并讨论了相应的舍入误差分析。文中报告了在CPU和GPU上开展的数值实验,结果表明所提方法相比原始雅可比方法具备更高的效率。

英文摘要:

The eigenvalue problem is a fundamental problem in scientific computing. In this paper, we first give the error analysis for a single step or sweep of Jacobi's method in floating point arithmetic. Then we propose a mixed precision preconditioned Jacobi method for the symmetric eigenvalue problem: We first compute the eigenvalue decomposition of a real symmetric matrix by an eigensolver at low precision and we obtain a low-precision matrix of eigenvectors; Then by using the high-precision modified Gram-Schmidt orthogonalization process, a high-precision orthogonal matrix is obtained, which is used as an initial guess for Jacobi's method. The rounding error analysis of the proposed method is established under some conditions. We also present a mixed precision preconditioned one-sided Jacobi method for the singular value problem and the corresponding rounding error analysis is discussed. Numerical experiments on CPUs and GPUs are reported to illustrate the efficiency of the proposed method over the original Jacobi method.

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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