Dimension-free mixing times of Gibbs samplers for Bayesian hierarchical models
贝叶斯层级模型中 Gibbs 采样器的维度无关混合时间AI 解读 ↓
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贝叶斯层级模型中 Gibbs 采样器的维度无关混合时间AI 解读 ↓
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Gibbs samplers are popular algorithms to approximate posterior distributions arising from Bayesian hierarchical models. Despite their popularity and good empirical performance, however, there are still relatively few quantitative results on their convergence properties, for example, much less than for gradient-based sampling methods. In this work, we analyse the behaviour of total variation mixing times of Gibbs samplers targeting hierarchical models using tools from Bayesian asymptotics. We obtain dimension-free convergence results under random data-generating assumptions for a broad class of two-level models with generic likelihood function. Specific examples with Gaussian, binomial and categorical likelihoods are discussed.