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arXiv 2501.18548math.STmath.PRstat.MEstat.TH
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无下冲采样器:一种局部自适应、无梯度的MCMC方法

The No-Underrun Sampler: A Locally-Adaptive, Gradient-Free MCMC Method

Nawaf Bou-Rabee, Bob Carpenter, Sifan Liu, Stefan Oberdörster

AI总结:

本文提出无下冲采样器(NURS),一种无需梯度的局部自适应MCMC方法,融合Hit-and-Run与No-U-Turn思想,理论保证可逆性及收敛性,实验成功采样Neal漏斗多尺度分布。

摘要:

在本文中,我们引入了无下冲采样器(NURS),一种局部自适应、无梯度的马尔可夫链蒙特卡洛方法,融合了Hit-and-Run和No-U-Turn采样器的思想。NURS无需梯度评估即可动态适应目标分布的局部尺度,特别适用于梯度不可用或计算成本高昂的应用场景。我们建立了关键的理论性质,包括可逆性、与Hit-and-Run和随机游走Metropolis的形式化联系、在高斯目标下与Hit-and-Run相当的Wasserstein收缩性,以及Hit-and-Run与NURS转移核之间总变差距离的界限。受理论见解支持的经验实验展示了NURS从Neal漏斗(贝叶斯层次推断中的一个具有挑战性的多尺度分布)中采样的能力。

英文摘要:

In this work, we introduce the No-Underrun Sampler (NURS), a locally-adaptive, gradient-free Markov chain Monte Carlo method that blends ideas from Hit-and-Run and the No-U-Turn Sampler. NURS dynamically adapts to the local scale of the target distribution without requiring gradient evaluations, making it especially suitable for applications where gradients are unavailable or costly. We establish key theoretical properties, including reversibility, formal connections to Hit-and-Run and Random Walk Metropolis, Wasserstein contraction comparable to Hit-and-Run in Gaussian targets, and bounds on the total variation distance between the transition kernels of Hit-and-Run and NURS. Empirical experiments, supported by theoretical insights, illustrate the ability of NURS to sample from Neal's funnel, a challenging multi-scale distribution from Bayesian hierarchical inference.

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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