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arXiv 1802.06340stat.ME
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基于广义分数匹配的非负数据图形模型

Graphical Models for Non-Negative Data Using Generalized Score Matching

Shiqing Yu, Mathias Drton, Ali Shojaie

摘要:

在估计概率密度函数的参数时,一个常见的挑战是归一化常数的棘手性。虽然在这种情况下,可以使用数值积分来实现极大似然估计,但是该方法在计算上变得密集。相比之下,Hyvärinen(2005)的得分匹配方法避免了直接计算归一化常数,并为$\mathbb{R}^m$上的连续分布的指数族提供了封闭形式的估计。Hyvärinen(2007)将该方法扩展到非负正负号$\mathbb{R}_+^m$上支持的分布。在本文中,我们给出了一个广义形式的得分匹配的非负数据,提高了估计效率。我们还将Lin等人的正则化得分匹配方法推广到非负高斯图模型(2016),并改进了理论保证。

英文摘要:

A common challenge in estimating parameters of probability density functions is the intractability of the normalizing constant. While in such cases maximum likelihood estimation may be implemented using numerical integration, the approach becomes computationally intensive. In contrast, the score matching method of Hyvärinen (2005) avoids direct calculation of the normalizing constant and yields closed-form estimates for exponential families of continuous distributions over $\mathbb{R}^m$. Hyvärinen (2007) extended the approach to distributions supported on the non-negative orthant $\mathbb{R}_+^m$. In this paper, we give a generalized form of score matching for non-negative data that improves estimation efficiency. We also generalize the regularized score matching method of Lin et al. (2016) for non-negative Gaussian graphical models, with improved theoretical guarantees.

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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