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arXiv 1705.04579stat.CO
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弹性粒子采样器的指数遍历性

Exponential Ergodicity of the Bouncy Particle Sampler

George Deligiannidis, Alexandre Bouchard-Côté, Arnaud Doucet

摘要:

基于分段确定性马尔可夫过程的不可逆马尔可夫链蒙特卡罗方法近年来被广泛应用于概率论、自动控制、物理和统计等领域。虽然这些算法在实验上表现出良好的性能,并因此越来越多地用于广泛的应用,几何遍历性的结果,这些计划只建立到目前为止,在非常严格的假设。我们在这里给可验证的条件下,在\cite{P_dW_12}中引入的弹性粒子采样算法的目标分布是几何遍历。只要目标满足曲率条件,并且尾部的衰减速度至少与指数分布一样快,最多与高斯分布一样快,这一点就成立。这使我们能够提供一个中心极限定理相关的遍历平均。当目标的尾巴薄于高斯分布,我们提出了一个原始的修改,这个计划是几何遍历。对于厚尾的目标分布,如$t$ -分布,我们扩展了\cite{J_G_12}在随机游动大都会背景下开创的想法。我们应用一个变量的变化,以获得一个转换后的目标满足尾部条件的几何遍历。通过使用Bouncy粒子采样器对变换后的目标进行采样,并将马尔可夫过程映射回原始参数化,得到了一种几何遍历算法。

英文摘要:

Non-reversible Markov chain Monte Carlo schemes based on piecewise deterministic Markov processes have been recently introduced in applied probability, automatic control, physics and statistics. Although these algorithms demonstrate experimentally good performance and are accordingly increasingly used in a wide range of applications, geometric ergodicity results for such schemes have only been established so far under very restrictive assumptions. We give here verifiable conditions on the target distribution under which the Bouncy Particle Sampler algorithm introduced in \cite{P_dW_12} is geometrically ergodic. This holds whenever the target satisfies a curvature condition and has tails decaying at least as fast as an exponential and at most as fast as a Gaussian distribution. This allows us to provide a central limit theorem for the associated ergodic averages. When the target has tails thinner than a Gaussian distribution, we propose an original modification of this scheme that is geometrically ergodic. For thick-tailed target distributions, such as $t$-distributions, we extend the idea pioneered in \cite{J_G_12} in a random walk Metropolis context. We apply a change of variable to obtain a transformed target satisfying the tail conditions for geometric ergodicity. By sampling the transformed target using the Bouncy Particle Sampler and mapping back the Markov process to the original parameterization, we obtain a geometrically ergodic algorithm.

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