arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1602.03572stat.CO
收藏

基于偏差测度的重要性抽样的有效样本容量

Effective Sample Size for Importance Sampling based on discrepancy measures

L. Martino, V. Elvira, F. Louzada

摘要:

有效样本容量(ESS)是蒙特卡罗方法(如马尔可夫链蒙特卡罗(MCMC)和重要性抽样(IS)技术)效率的重要度量。在IS上下文中,广泛应用理论ESS定义的近似$\widehat{ESS}$,涉及归一化重要性权重的平方和的倒数。这个公式,$\widehat{ESS}$,已经成为序贯蒙特卡罗(SMC)方法中的一个重要部分,用于评估重新排序步骤的便利性。从另一个角度来看,表达式$\widehat{ESS}$与由归一化权重描述的概率质量和离散均匀概率质量函数(pmf)之间的欧几里得距离有关。在这项工作中,我们推导出其他可能的ESS功能的基础上,这两个pmfs之间的不同的差异措施。提供了几个例子,涉及,例如,几何平均的权重,离散熵(包括thepersperity措施,已经在文献中提出)和基尼系数等。我们列出了五个理论要求,一个通用的ESS功能应该满足,使我们能够分类不同的ESS措施。我们还比较了最有前途的通过数值模拟。

英文摘要:

The Effective Sample Size (ESS) is an important measure of efficiency of Monte Carlo methods such as Markov Chain Monte Carlo (MCMC) and Importance Sampling (IS) techniques. In the IS context, an approximation $\widehat{ESS}$ of the theoretical ESS definition is widely applied, involving the inverse of the sum of the squares of the normalized importance weights. This formula, $\widehat{ESS}$, has become an essential piece within Sequential Monte Carlo (SMC) methods, to assess the convenience of a resampling step. From another perspective, the expression $\widehat{ESS}$ is related to the Euclidean distance between the probability mass described by the normalized weights and the discrete uniform probability mass function (pmf). In this work, we derive other possible ESS functions based on different discrepancy measures between these two pmfs. Several examples are provided involving, for instance, the geometric mean of the weights, the discrete entropy (including theperplexity measure, already proposed in literature) and the Gini coefficient among others. We list five theoretical requirements which a generic ESS function should satisfy, allowing us to classify different ESS measures. We also compare the most promising ones by means of numerical simulations.

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。

↑