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arXiv 1402.2828stat.CO
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分解抽样在大城市Hastings聚类中的应用

Decomposition Sampling applied to Parallelization of Metropolis-Hastings

Jonas Hallgren, Timo Koski

摘要:

本文提出了一种随机变量的抽样算法,通过将样本空间划分为重叠部分,将抽样过程分解为多个子问题。子问题可以彼此独立地解决,因此非常适合并行化。此外,在这些子问题中的每一个上,可以使用不同的和独立的采样方法。换句话说,可以为样本空间的特定部分设计特定的采样器。该算法被证明在一个粒子边缘的Metropolis-Hastings采样器适用于波动率模型和两个玩具的例子校准。在实验中观察到显着的加速和减少的总变异。

英文摘要:

This paper presents an algorithm for sampling random variables that allows to separation of the sampling process into subproblems by dividing the sample space into overlapping parts. The subproblems can be solved independently of each other and are thus well suited for parallelization. Furthermore, on each of these subproblems it is possible to use distinct and independent sampling methods. In other words, specific samplers can be designed for specific parts of the sample space. The algorithms are demonstrated on a particle marginal Metropolis-Hastings sampler applied to calibration of a volatility model and two toy examples. Significant speedup and decrease of total variation is observed in experiments.

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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