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arXiv 1402.4577math.PRmath.STstat.TH
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马尔可夫链Wasserstein距离的次几何收敛速度

Subgeometric rates of convergence in Wasserstein distance for Markov chains

Alain Durmus, Gersende Fort, Eric Moulines

摘要:

本文给出了一般状态空间马尔可夫链(可能)非不可约的不变分布的存在性和Wasserstein距离的次几何收敛速度的充分条件.与以前的工作相比,我们的方法是基于一个纯粹的概率耦合建设,允许检索率的收敛匹配以前报道的收敛全变差。我们的结果被应用于建立Wasserstein距离的亚几何遍历性的非线性自回归模型和预条件Crank-Nicolson马尔可夫链Monte Carlo算法在希尔伯特空间。

英文摘要:

In this paper, we provide sufficient conditions for the existence of the invariant distribution and for subgeometric rates of convergence in Wasserstein distance for general state-space Markov chains which are (possibly) not irreducible. Compared to previous work, our approach is based on a purely probabilistic coupling construction which allows to retrieve rates of convergence matching those previously reported for convergence in total variation. Our results are applied to establish the subgeometric ergodicity in Wasserstein distance of non-linear autoregressive models and of the pre-conditioned Crank-Nicolson Markov chain Monte Carlo algorithm in Hilbert space.

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