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arXiv 1507.06244stat.CO
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贝叶斯反问题流形蒙特卡罗方法中高阶张量的仿真

Emulation of Higher-Order Tensors in Manifold Monte Carlo Methods for Bayesian Inverse Problems

Shiwei Lan, Tan Bui-Thanh, Mike Christie, Mark Girolami

摘要:

逆问题的贝叶斯方法主要依赖于用于后验推理的马尔可夫链蒙特卡罗方法。在许多这样的反问题中观察到的典型的非线性浓度的后验测量提出了严峻的挑战,现有的基于仿真的推理方法。出于这些挑战的利用局部几何信息的形式,协变梯度,度量张量,列维-奇维塔连接,和本地测地线流,已被引入到更有效地本地探索配置空间的后验测度。然而,获得这样的几何量通常需要大量的计算工作,尽管它们的有效性影响这些基于几何的蒙特卡罗方法的适用性。在本文中,我们探讨了一种方法来解决这个问题,通过构建一个模拟器的模型,所有的几何对象可以得到一个更计算可行的方式。主要概念是使用高斯过程仿真器来近似几何量,该仿真器以精心选择的配置点的设计集为条件,这也决定了仿真器的质量。为此,我们建议使用统计实验设计方法来完善一个潜在的任意初始化的设计在线不破坏所产生的马尔可夫链的收敛到所需的不变测度。本文中考虑的实际例子提供了一个显着的改进可能在计算负载方面的证明,这是一个有前途的途径,进一步发展。

英文摘要:

The Bayesian approach to Inverse Problems relies predominantly on Markov Chain Monte Carlo methods for posterior inference. The typical nonlinear concentration of posterior measure observed in many such Inverse Problems presents severe challenges to existing simulation based inference methods. Motivated by these challenges the exploitation of local geometric information in the form of covariant gradients, metric tensors, Levi-Civita connections, and local geodesic flows, have been introduced to more effectively locally explore the configuration space of the posterior measure. However, obtaining such geometric quantities usually requires extensive computational effort and despite their effectiveness affect the applicability of these geometrically-based Monte Carlo methods. In this paper we explore one way to address this issue by the construction of an emulator of the model from which all geometric objects can be obtained in a much more computationally feasible manner. The main concept is to approximate the geometric quantities using a Gaussian Process emulator which is conditioned on a carefully chosen design set of configuration points, which also determines the quality of the emulator. To this end we propose the use of statistical experiment design methods to refine a potentially arbitrarily initialized design online without destroying the convergence of the resulting Markov chain to the desired invariant measure. The practical examples considered in this paper provide a demonstration of the significant improvement possible in terms of computational loading suggesting this is a promising avenue of further development.

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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