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arXiv 1205.2637cs.AI
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计算置信度传播

Counting Belief Propagation

Fraunhofer IAIS(弗劳恩霍夫智能分析与信息系统研究所);University of Wisconsin(威斯康星大学)

Kristian Kersting, Babak Ahmadi, Sriraam Natarajan

摘要:

图形模型的一个主要好处是,大多数知识都可以在模型结构中捕获。然而,许多模型产生的推理问题,有很多对称性没有反映在图形结构中,因此不能利用有效的推理技术,如信念传播(BP)。在本文中,我们提出了一个新的和简单的BP算法,称为计数BP,利用这种额外的对称性。从一个给定的因子图开始,计数BP首先构建一个压缩的clusternodes和clusterfactors的因子图,对应于给定证据不可区分的节点和因子集。然后在压缩后的图上运行一个修改后的BP算法,这相当于在原始因子图上运行BP。我们的实验表明,计数BP适用于各种重要的人工智能任务,如(动态)关系模型和布尔模型计数,并且可以获得显着的效率提高,通常是数量级。

英文摘要:

A major benefit of graphical models is that most knowledge is captured in the model structure. Many models, however, produce inference problems with a lot of symmetries not reflected in the graphical structure and hence not exploitable by efficient inference techniques such as belief propagation (BP). In this paper, we present a new and simple BP algorithm, called counting BP, that exploits such additional symmetries. Starting from a given factor graph, counting BP first constructs a compressed factor graph of clusternodes and clusterfactors, corresponding to sets of nodes and factors that are indistinguishable given the evidence. Then it runs a modified BP algorithm on the compressed graph that is equivalent to running BP on the original factor graph. Our experiments show that counting BP is applicable to a variety of important AI tasks such as (dynamic) relational models and boolean model counting, and that significant efficiency gains are obtainable, often by orders of magnitude.

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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