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arXiv 1806.09780stat.COstat.ML
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基于拟牛顿建议的相关伪边缘Metropolis-Hastings算法

Correlated pseudo-marginal Metropolis-Hastings using quasi-Newton proposals

Johan Dahlin, Adrian Wills, Brett Ninness

摘要:

伪边缘Metropolis-Hastings(pmMH)是一种通用的算法,用于从不容易逐点评估的目标分布中采样。然而,pmMH需要良好的建议分布来有效地从目标中采样,这在实践中可能是有问题的。当标准的随机游走方案效率低下时,这对于高维目标尤其是一个问题。我们扩展了pmMH,允许构建的建议的基础上,从多个过去的迭代信息。因此,可以采用拟牛顿(qN)方法来形成利用梯度信息将马尔可夫链引导到高概率区域的建议,并构造局部曲率的近似以缩放步长。所提出的方法证明了几个问题,这表明,qN建议可以比其他常见的海森为基础的建议更好地执行。

英文摘要:

Pseudo-marginal Metropolis-Hastings (pmMH) is a versatile algorithm for sampling from target distributions which are not easy to evaluate point-wise. However, pmMH requires good proposal distributions to sample efficiently from the target, which can be problematic to construct in practice. This is especially a problem for high-dimensional targets when the standard random-walk proposal is inefficient. We extend pmMH to allow for constructing the proposal based on information from multiple past iterations. As a consequence, quasi-Newton (qN) methods can be employed to form proposals which utilize gradient information to guide the Markov chain to areas of high probability and to construct approximations of the local curvature to scale step sizes. The proposed method is demonstrated on several problems which indicate that qN proposals can perform better than other common Hessian-based proposals.

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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