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关注这篇论文的作者
Prithwish Ghosh
Sujit K Ghosh

利用切片 Gibbs 采样器高效快速地从任意概率核采样

研究问题
如何对未归一化、非光滑、厚尾或高度多峰的有限维概率核自动采样,减少人为调参并改善样本混合?
方法与思路
作者提出自动切片 Gibbs 框架,将基于 Cauchy 变换的有效支撑估计与切片更新结合,在每轮循环中自动校准。
材料陈述的贡献
摘要称算法保持不变性与遍历性,并在所列复杂核实验中较若干对照方法获得更高的每秒有效样本量与更快去相关。
阅读关注点
应核对不变性和遍历性的适用条件、有效支撑检测对断开区域的处理,以及调参成本和计算时间比较是否公平。
阅读边界
材料为 arXiv v2 预印本,不能据此声称已同行评审或期刊接收。普遍适用性、理论条件及实验数值仍需查阅全文。

原文摘要

An Automated Sliced Gibbs framework is proposed for fully automated Markov chain Monte Carlo sampling from arbitrary finite dimensional probability kernels. The method targets unnormalized, non-smooth, heavy tailed, and highly multimodal densities. A Cauchy transformation based effective support estimator is combined with slice driven Gibbs updates. This construction removes the need for user specified truncation bounds, proposal scales, step-size tuning, or conditional optimization. Unlike existing slice samplers, ASG does not require manually chosen bracket widths or geometric insight into the support. All calibration is performed automatically within each Gibbs cycle. The resulting Markov chain preserves invariance and ergodicity. Automated support detection allows efficient movement across disconnected high density regions. The sampler adapts to sharp curvature and irregular geometry without gradient information. Extensive numerical experiments evaluate performance on complex kernels, including univariate Beta mixtures, multivariate Rosenbrock and Ackley benchmarks, and non-smooth kernels derived from generalized LASSO type loss functions. Across these challenging settings, ASG consistently achieves higher effective sample size per second and faster decorrelation than Random Walk Metropolis Hastings, adaptive Gibbs variants, and some recently proposed slice based methods. The framework provides a scalable and general-purpose solution for sampling from complicated probability kernels where existing algorithms require substantial tuning or exhibit slow mixing.

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