arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1706.04780stat.CO
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大数据的重中心并行MCMC平均值

Average of Recentered Parallel MCMC for Big Data

Changye Wu, Christian P. Robert

摘要:

在大数据背景下,传统的MCMC方法,如梅特罗波利斯-黑斯廷斯算法和混合蒙特卡罗,可扩展性差,因为它们需要在每次迭代时评估整个数据集的可能性。为了复活MCMC方法,许多方法属于两类:分而治之和子采样,提出。在本文中,我们研究了并行MCMC,并提出了一种新的组合方法,在分治的框架。与一致性蒙特卡罗、Weierstrass Sampler等并行MCMC方法相比,该方法不采用子后验样本,而是对重标后验样本进行MCMC计算,但并行计算开销相同。我们还给出了我们的方法的数学理由,并在几个模型中显示其性能。此外,尽管我们的新方法是在参数框架下提出的,但它可以毫无困难地应用于非参数情况。

英文摘要:

In big data context, traditional MCMC methods, such as Metropolis-Hastings algorithms and hybrid Monte Carlo, scale poorly because of their need to evaluate the likelihood over the whole data set at each iteration. In order to resurrect MCMC methods, numerous approaches belonging to two categories: divide-and-conquer and subsampling, are proposed. In this article, we study the parallel MCMC and propose a new combination method in the divide-and-conquer framework. Compared with some parallel MCMC methods, such as consensus Monte Carlo, Weierstrass Sampler, instead of sampling from subposteriors, our method runs MCMC on rescaled subposteriors, but share the same computation cost in the parallel stage. We also give the mathematical justification of our method and show its performance in several models. Besides, even though our new methods is proposed in parametric framework, it can been applied to non-parametric cases without difficulty.

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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