Multi-Scale Vecchia Approximations of Gaussian Processes
Multi-Scale Vecchia Approximations of Gaussian Processes
复制标题
高斯过程的多尺度 Vecchia 近似
DOI:
10.1007/s13253-022-00488-0
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发表时间:
2022
期刊:
影响因子:
--
通讯作者:
Katzfuss, Matthias
中科院分区:
文献类型:
--
作者:
Zhang, Jingjie;Katzfuss, Matthias
Gaussian processes (GPs) are popular models for functions, time series, and spatial fields, but direct application of GPs is computationally infeasible for large datasets. We propose a multi-scale Vecchia (MSV) approximation of GPs for modeling and analysis of multi-scale phenomena, which are ubiquitous in geophysical and other applications. In the MSV approach, increasingly large sets of variables capture increasingly small scales of spatial variation, to obtain an accurate approximation of the spatial dependence from very large to very fine scales. For a given set of observations, the MSV approach decomposes the data into different scales, which can be visualized to obtain insights into the underlying processes. We explore properties of the MSV approximation and propose an algorithm for automatic choice of the tuning parameters. We provide comparisons to existing approaches based on simulated data and using satellite measurements of land-surface temperature.
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DOI:
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1996
期刊:
Proceedings of IEEE international conference on image processing
影响因子:
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作者:
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通讯作者:
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影响因子:
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影响因子:
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2005
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2007-07
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通讯作者:
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