arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2310.03040stat.COmath.PR
收藏

用于不确定性量化与稀有事件估计的嵌套抽样(Nested Sampling)

Nested Sampling for Uncertainty Quantification and Rare Event Estimation

Jonas Latz, Doris Schneider, Philipp Wacker

AI总结:

本研究论证了嵌套抽样方法对含不可忽略平台区被积函数的有效性,并验证其在稀有事件(对数)概率估计中的实际效用,拓展了该贝叶斯证据计算方法的适用场景。

摘要:

嵌套抽样(Nested Sampling)是一种用于计算贝叶斯证据(又称边际似然)的方法,贝叶斯证据即似然函数关于先验的积分。更广义地说,它是一种数值概率求积规则。嵌套抽样的核心思想是通过对合适的变换采用前推(push-forward)操作,将参数空间上的高维似然积分替换为单位区间上的积分。在实际操作中,一组活跃样本会沿着被积函数的水平集向上攀升,同时对超水平集的测度收缩量进行统计估计。我们论证了该方法在处理具有不可忽略平台区的被积函数时的有效性,并展示了嵌套抽样在估计稀有事件(对数)概率方面的实际效用。

英文摘要:

Nested Sampling is a method for computing the Bayesian evidence, also called the marginal likelihood, which is the integral of the likelihood with respect to the prior. More generally, it is a numerical probabilistic quadrature rule. The main idea of Nested Sampling is to replace a high-dimensional likelihood integral over parameter space with an integral over the unit line by employing a push-forward with respect to a suitable transformation. Practically, a set of active samples ascends the level sets of the integrand function, with the measure contraction of the super-level sets being statistically estimated. We justify the validity of this approach for integrands with non-negligible plateaus, and demonstrate Nested Sampling's practical effectiveness in estimating the (log-)probability of rare events.

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。

↑