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arXiv 0901.0786cs.AI
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基于Loop演算和置信传播的平面图近似推理

Approximate inference on planar graphs using Loop Calculus and Belief Propagation

Radboud University Nijmegen(拉德堡德大学奈梅亨分校);Los Alamos National Laboratory(洛斯阿拉莫斯国家实验室)

V. Gómez, H. J. Kappen, M. Chertkov

摘要:

我们介绍了新的结果近似推理平面图形模型使用循环演算框架。循环演算(Chertkov和Chernyak,2006)允许将图形模型的精确分区函数表示为有限项和,一旦置信传播(BP)解决方案已知,就可以对其进行评估。一般来说,对所有校正项的完全求和是难以处理的。我们开发了一种算法,用于(Certkov等人,2008),它代表了一个有效的截断计划,平面图和一个新的表示的系列在Pfrons的矩阵。我们分析了网格和其他平面图上的二元变量和成对相互作用模型的配分函数近似算法的性能。我们详细研究了环路系列和等效Pfwean系列,并表明Pfwean系列的第一项的一般,棘手的平面模型,可以提供非常准确的近似。该算法优于以前的截断计划的循环系列和竞争力与其他国家的最先进的近似推理方法。

英文摘要:

We introduce novel results for approximate inference on planar graphical models using the loop calculus framework. The loop calculus (Chertkov and Chernyak, 2006) allows to express the exact partition function of a graphical model as a finite sum of terms that can be evaluated once the belief propagation (BP) solution is known. In general, full summation over all correction terms is intractable. We develop an algorithm for the approach presented in (Certkov et al., 2008) which represents an efficient truncation scheme on planar graphs and a new representation of the series in terms of Pfaffians of matrices. We analyze the performance of the algorithm for the partition function approximation for models with binary variables and pairwise interactions on grids and other planar graphs. We study in detail both the loop series and the equivalent Pfaffian series and show that the first term of the Pfaffian series for the general, intractable planar model, can provide very accurate approximations. The algorithm outperforms previous truncation schemes of the loop series and is competitive with other state-of-the-art methods for approximate inference.

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