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arXiv 1606.03432cs.LGcs.AIstat.ML
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吉布斯抽样中的扫描顺序:它的重要性和界限的模型

Scan Order in Gibbs Sampling: Models in Which it Matters and Bounds on How Much

Stanford University(斯坦福大学)

Bryan He, Christopher De Sa, Ioannis Mitliagkas, Christopher Ré

摘要:

吉布斯抽样是一种马尔可夫链蒙特卡罗抽样技术,它迭代地从条件分布中对变量进行抽样。变量有两种常见的扫描顺序:随机扫描和系统扫描。由于硬件中局部性的好处,通常使用系统扫描,即使大多数统计保证仅用于随机扫描。虽然它已被证实,随机扫描和系统扫描的混合时间不超过一个对数因子的差异,我们通过反例表明,情况并非如此,我们证明,混合时间不超过一个多项式因子在温和的条件下。为了证明这些相对的界限,我们引入了一种方法,增加状态空间来研究系统扫描电导。

英文摘要:

Gibbs sampling is a Markov Chain Monte Carlo sampling technique that iteratively samples variables from their conditional distributions. There are two common scan orders for the variables: random scan and systematic scan. Due to the benefits of locality in hardware, systematic scan is commonly used, even though most statistical guarantees are only for random scan. While it has been conjectured that the mixing times of random scan and systematic scan do not differ by more than a logarithmic factor, we show by counterexample that this is not the case, and we prove that that the mixing times do not differ by more than a polynomial factor under mild conditions. To prove these relative bounds, we introduce a method of augmenting the state space to study systematic scan using conductance.

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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