arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.14801math.STstat.TH
收藏

双分量MCMC采样器的收敛速度

Convergence Rates of Two-Component MCMC Samplers

Qian Qin, Galin L. Jones

摘要:

包括Gibbs和条件Metropolis-Hastings采样器在内的连续MCMC算法通常用于从多变量概率分布中采样。关于吉布斯算法的一个长期存在的问题是确定性扫描(系统扫描)采样器是否比随机扫描采样器收敛得更快。我们回答这个问题时,采样器涉及两个组件通过建立一个精确的定量关系$L^2$的两个采样器的收敛速度。该关系表明,确定性扫描采样器收敛得更快。我们还建立了定性的关系之间的收敛速度的两个组件的吉布斯采样器和一些条件Metropolis-Hastings变体。例如,它示出,如果一些两个组件的条件Metropolis-Hastings采样器是几何遍历的,那么相关联的吉布斯采样器。

英文摘要:

Component-wise MCMC algorithms, including Gibbs and conditional Metropolis-Hastings samplers, are commonly used for sampling from multivariate probability distributions. A long-standing question regarding Gibbs algorithms is whether a deterministic-scan (systematic-scan) sampler converges faster than its random-scan counterpart. We answer this question when the samplers involve two components by establishing an exact quantitative relationship between the $L^2$ convergence rates of the two samplers. The relationship shows that the deterministic-scan sampler converges faster. We also establish qualitative relations among the convergence rates of two-component Gibbs samplers and some conditional Metropolis-Hastings variants. For instance, it is shown that if some two-component conditional Metropolis-Hastings samplers are geometrically ergodic, then so are the associated Gibbs samplers.

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。

↑