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arXiv 2109.02777stat.COcs.NAmath.NA
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高斯过程的有限元表示:平衡数值和统计精度

Finite Element Representations of Gaussian Processes: Balancing Numerical and Statistical Accuracy

Daniel Sanz-Alonso, Ruiyi Yang

摘要:

高斯过程的随机偏微分方程方法用$n$有限元基函数和具有稀疏精度矩阵的高斯系数表示Matérn GP先验.这种表示通过设置$n\approx N$并利用稀疏性来增强GP回归和分类对大尺寸$N$的数据集的可扩展性。在本文中,我们重新考虑的标准选择$n \approx N$通过分析的估计性能。我们的理论意味着,在一定的平滑性假设下,可以通过将$n \ll N$设置在大的$N$渐近中来降低计算和存储成本,而不妨碍估计精度。数值实验说明了我们的理论的适用性和效果的前长度尺度在前渐近制度。

英文摘要:

The stochastic partial differential equation approach to Gaussian processes (GPs) represents Matérn GP priors in terms of $n$ finite element basis functions and Gaussian coefficients with sparse precision matrix. Such representations enhance the scalability of GP regression and classification to datasets of large size $N$ by setting $n\approx N$ and exploiting sparsity. In this paper we reconsider the standard choice $n \approx N$ through an analysis of the estimation performance. Our theory implies that, under certain smoothness assumptions, one can reduce the computation and memory cost without hindering the estimation accuracy by setting $n \ll N$ in the large $N$ asymptotics. Numerical experiments illustrate the applicability of our theory and the effect of the prior lengthscale in the pre-asymptotic regime.

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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