arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1802.00515stat.MEmath.FA
收藏

基于高斯岭函数的降维

Dimension Reduction via Gaussian Ridge Functions

Pranay Seshadri, Shaowu Yuchi, Geoffrey T. Parks

摘要:

脊函数最近出现了一个强大的一套想法为基础的子空间降维。在本文中,我们首先画平行脊子空间,充分的降维和积极的子空间,对比技术植根于统计回归和那些植根于近似理论。这为我们的新算法奠定了基础,该算法近似于我们所说的高斯脊函数-降维子空间上高斯过程的后验均值-适用于回归和近似问题。为了计算这个子空间,我们开发了一种迭代算法,该算法在Stiefel流形上进行优化以计算子空间,然后对高斯过程的超参数进行优化。我们证明了两个分析函数,在那里我们获得近精确的脊恢复算法的实用性,和一个简单的案例研究,在那里我们比较了我们的方法与三个众所周知的充分的降维方法的功效:SIR,SAVE,CR。的比较激励使用的后验方差作为一种启发式识别的降维子空间的适用性。

英文摘要:

Ridge functions have recently emerged as a powerful set of ideas for subspace-based dimension reduction. In this paper we begin by drawing parallels between ridge subspaces, sufficient dimension reduction and active subspaces, contrasting between techniques rooted in statistical regression and those rooted in approximation theory. This sets the stage for our new algorithm that approximates what we call a Gaussian ridge function---the posterior mean of a Gaussian process on a dimension-reducing subspace---suitable for both regression and approximation problems. To compute this subspace we develop an iterative algorithm that optimizes over the Stiefel manifold to compute the subspace, followed by an optimization of the hyperparameters of the Gaussian process. We demonstrate the utility of the algorithm on two analytical functions, where we obtain near exact ridge recovery, and a turbomachinery case study, where we compare the efficacy of our approach with three well-known sufficient dimension reduction methods: SIR, SAVE, CR. The comparisons motivate the use of the posterior variance as a heuristic for identifying the suitability of a dimension-reducing subspace.

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。

↑