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arXiv 2002.03747math.NAcs.NAstat.CO
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一类部分观测扩散的无偏滤波

Unbiased Filtering of a Class of Partially Observed Diffusions

Ajay Jasra, Kody Law, Fangyuan Yu

摘要:

在这篇文章中,我们考虑一个基于蒙特卡罗的方法来过滤部分观察到的扩散定期和离散时间。由于只访问欧拉离散的扩散过程,我们提出了一个新的程序,可以返回在线估计的过滤分布,没有离散偏差和有限的方差。我们的方法基于Rhee & Glynn(2015)的随机化方法以及Jasra等人(2017)的多级粒子滤波(MLPF)方法的新型双重应用。我们的新方法与MLPF,在一个单一的处理器上的数值比较表明,类似的错误是可能的计算成本略有增加。然而,新方法的规模强大,任意多个处理器。

英文摘要:

In this article we consider a Monte Carlo-based method to filter partially observed diffusions observed at regular and discrete times. Given access only to Euler discretizations of the diffusion process, we present a new procedure which can return online estimates of the filtering distribution with no discretization bias and finite variance. Our approach is based upon a novel double application of the randomization methods of Rhee & Glynn (2015) along with the multilevel particle filter (MLPF) approach of Jasra et al (2017). A numerical comparison of our new approach with the MLPF, on a single processor, shows that similar errors are possible for a mild increase in computational cost. However, the new method scales strongly to arbitrarily many processors.

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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