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arXiv 1509.04752stat.MLstat.COstat.ME
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时空峰板先验的贝叶斯推断

Bayesian inference for spatio-temporal spike-and-slab priors

Michael Riis Andersen, Aki Vehtari, Ole Winther, Lars Kai Hansen

摘要:

在这项工作中,我们解决的问题,解决了一系列欠定线性反问题的稀疏约束。我们推广的尖峰和板先验分布编码先验相关的支持的解决方案在空间和时间上施加一个变换的高斯过程的尖峰和板的概率。在此模型下,给出了一种后验推理的期望传播算法。对于大规模问题,标准EP算法可能非常慢。因此,我们引入三种不同的近似方案,以减少计算复杂度。最后,我们证明了所提出的模型使用数值实验的基础上合成和真实的数据集。

英文摘要:

In this work, we address the problem of solving a series of underdetermined linear inverse problems subject to a sparsity constraint. We generalize the spike-and-slab prior distribution to encode a priori correlation of the support of the solution in both space and time by imposing a transformed Gaussian process on the spike-and-slab probabilities. An expectation propagation (EP) algorithm for posterior inference under the proposed model is derived. For large scale problems, the standard EP algorithm can be prohibitively slow. We therefore introduce three different approximation schemes to reduce the computational complexity. Finally, we demonstrate the proposed model using numerical experiments based on both synthetic and real data sets.

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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