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arXiv 1306.6462stat.CO
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自适应序贯蒙特卡罗方法的收敛性

On the Convergence of Adaptive Sequential Monte Carlo Methods

Alexandros Beskos, Ajay Jasra, Nikolas Kantas, Alexandre Thiery

摘要:

在序贯蒙特卡罗(SMC)方法的几种实现中,利用样本的历史信息来最佳地调整它们的后续传播是自然的,并且在算法效率方面是重要的。在这篇文章中,我们提供了一个精心制定的渐近理论一类这样的\emph{adaptive} SMC方法。这里开发的理论框架将涵盖,假设下,几种常用的SMC算法。这种自适应方法的理论基础只有有限的结果:我们将通过为其中一些算法提供弱大数定律(WLLN)和中心极限定理(CLT)来弥合这一差距。后者似乎是第一次在文献中的同类结果,并提供了一个正式的理由,在许多真实的数据环境中使用的算法。我们建立,对于一般类的自适应SMC算法的自适应SMC方法的估计量的渐近方差是\emph{identical}的所谓的“完美”SMC算法,使用理想的建议内核。我们的研究结果支持应用程序上的一个复杂的高维后验分布与Navier-Stokes模型,其中适应高维参数的建议内核是算法的效率至关重要。

英文摘要:

In several implementations of Sequential Monte Carlo (SMC) methods it is natural, and important in terms of algorithmic efficiency, to exploit the information of the history of the samples to optimally tune their subsequent propagations. In this article we provide a carefully formulated asymptotic theory for a class of such \emph{adaptive} SMC methods. The theoretical framework developed here will cover, under assumptions, several commonly used SMC algorithms. There are only limited results about the theoretical underpinning of such adaptive methods: we will bridge this gap by providing a weak law of large numbers (WLLN) and a central limit theorem (CLT) for some of these algorithms. The latter seems to be the first result of its kind in the literature and provides a formal justification of algorithms used in many real data context. We establish that for a general class of adaptive SMC algorithms the asymptotic variance of the estimators from the adaptive SMC method is \emph{identical} to a so-called `perfect' SMC algorithm which uses ideal proposal kernels. Our results are supported by application on a complex high-dimensional posterior distribution associated with the Navier-Stokes model, where adapting high-dimensional parameters of the proposal kernels is critical for the efficiency of the algorithm.

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