MALA-within-Gibbs Samplers for High-Dimensional Distributions with Sparse Conditional Structure

MALA-within-Gibbs Samplers for High-Dimensional Distributions with Sparse Conditional Structure
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用于具有稀疏条件结构的高维分布的 MALA-in-Gibbs 采样器

DOI:
10.1137/19m1284014
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发表时间:
2020
影响因子:
3.1
通讯作者:
Marzouk, Y. M.
Marzouk, Y. M.
中科院分区:
数学2区
文献类型:
--
作者:
Tong, X. T.;Morzfeld, M.;Marzouk, Y. M.

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马尔可夫链蒙特卡罗(MCMC)采样器是从给定的目标概率分布中抽取样本的数值方法。我们讨论了一个特殊的MCMC采样器,MALA内吉布斯采样器,从理论和实践的角度。我们首先表明,这个采样器的接受率和步长是独立的整体问题的尺寸时,(i)的目标分布具有稀疏的条件结构,和(ii)这种结构是反映在部分更新策略的MALA-within-Gibbs。此外,如果目标密度是块对数凹的,则采样器的收敛速度与维数无关。从实际的角度来看,我们预计MALA-within-Gibbs是有用的解决高维贝叶斯推理问题,后验表现出稀疏的条件结构至少近似。在这种情况下,必须找到一个分区的状态,正确地反映了稀疏的条件结构,我们说明了这个过程中的两个数值例子。我们还讨论了用于部分更新和计算要求,可能会增加与块的数量的块大小之间的权衡。
Markov chain Monte Carlo (MCMC) samplers are numerical methods for drawing samples from a given target probability distribution. We discuss one particular MCMC sampler, the MALA-within-Gibbs sampler, from the theoretical and practical perspectives. We first show that the acceptance ratio and step size of this sampler are independent of the overall problem dimension when (i) the target distribution has sparse conditional structure, and (ii) this structure is reflected in the partial updating strategy of MALA-within-Gibbs. If, in addition, the target density is blockwise log-concave, then the sampler's convergence rate is independent of dimension. From a practical perspective, we expect that MALA-within-Gibbs is useful for solving high-dimensional Bayesian inference problems where the posterior exhibits sparse conditional structure at least approximately. In this context, a partitioning of the state that correctly reflects the sparse conditional structure must be found, and we illustrate this process in two numerical examples. We also discuss trade-offs between the block size used for partial updating and computational requirements that may increase with the number of blocks.
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