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arXiv 1607.01458stat.COcs.NAmath.NA
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函数空间中的混合自适应MCMC算法

A hybrid adaptive MCMC algorithm in function spaces

Shanghai Jiao Tong University(上海交通大学)

Qingping Zhou, Zixi Hu, Zhewei Yao, Jinglai Li

AI总结:

本文提出一种混合自适应MCMC算法,结合自适应Metropolis方案与标准pCN算法,提升函数空间中采样效率,并满足重要遍历性条件。

摘要:

预条件Crank-Nicolson(pCN)方法是一种马尔可夫链蒙特卡洛(MCMC)方案,专门设计用于函数空间中的贝叶斯推断。与许多标准MCMC算法不同,pCN方法可以在网格细化下保持采样效率,这一特性称为维度无关性。本文考虑了一种自适应策略以进一步提高pCN的效率。具体而言,我们开发了一种混合自适应MCMC方法:该算法在选定的有限维子空间中执行自适应Metropolis方案,并在选定子空间的补空间中执行标准pCN算法。我们证明了所提出算法满足某些重要的遍历性条件。最后,通过数值示例我们展示了所提出方法与现有自适应算法具有竞争性的性能。

英文摘要:

The preconditioned Crank-Nicolson (pCN) method is a Markov Chain Monte Carlo (MCMC) scheme, specifically designed to perform Bayesian inferences in function spaces. Unlike many standard MCMC algorithms, the pCN method can preserve the sampling efficiency under the mesh refinement, a property referred to as being dimension independent. In this work we consider an adaptive strategy to further improve the efficiency of pCN. In particular we develop a hybrid adaptive MCMC method: the algorithm performs an adaptive Metropolis scheme in a chosen finite dimensional subspace, and a standard pCN algorithm in the complement space of the chosen subspace. We show that the proposed algorithm satisfies certain important ergodicity conditions. Finally with numerical examples we demonstrate that the proposed method has competitive performance with existing adaptive algorithms.

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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