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Model comparison for Gibbs random fields using noisy reversible jump Markov chain Monte Carlo

机译:使用嘈杂可逆跳转Markov Chain Monte Carlo模型比较吉布斯随机字段

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The reversible jump Markov chain Monte Carlo (RJMCMC) method offers an across-model simulation approach for Bayesian estimation and model comparison, by exploring the sampling space that consists of several models of possibly varying dimensions. A naive implementation of RJMCMC to models like Gibbs random fields suffers from computational difficulties: the posterior distribution for each model is termed doubly-intractable since computation of the likelihood function is rarely available. Consequently, it is simply impossible to simulate a transition of the Markov chain in the presence of likelihood intractability. A variant of RJMCMC is presented, called noisy RJMCMC, where the underlying transition kernel is replaced with an approximation based on unbiased estimators. Based on previous theoretical developments, convergence guarantees for the noisy RJMCMC algorithm are provided. The experiments show that the noisy RJMCMC algorithm can be much more efficient than other exact methods, provided that an estimator with controlled Monte Carlo variance is used, a fact which is in agreement with the theoretical analysis. (C) 2018 Elsevier B.V. All rights reserved.
机译:可逆跳转马尔可夫链蒙特卡罗(RJMCMC)方法通过探索由多种可能变化尺寸的多种型号组成的采样空间,为贝叶斯估计和模型比较提供了跨模型仿真方法。刚刚实现GIBBS随机字段等模型的天真地实现了计算困难:每个模型的后部分布被称为双重侵扰,因为似然函数很少可用。因此,在存在似然性难善存在下,根本无法模拟马尔可夫链的转变。 rjmcmc的变体被呈现,称为噪声rjmcmc,其中基于非偏见的估计器的近似替换底层转换内核。基于先前的理论发展,提供了嘈杂的RJMCMC算法的收敛保证。实验表明,如果使用具有受控的蒙特卡罗方差的估计,则噪声RJMCMC算法可以比其他确切方法更有效,这是一个与理论分析一致的事实。 (c)2018 Elsevier B.v.保留所有权利。

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