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arXiv 1301.0576cs.AI
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一种基于全局一致参数先验的贝叶斯网络评分指标

A Bayesian Network Scoring Metric That Is Based On Globally Uniform Parameter Priors

Center for Biomedical Informatics(生物医学信息学中心);Intelligent Systems Program(智能系统项目);University of Pittsburgh(匹兹堡大学)

Mehmet Kayaalp, Gregory F. Cooper

摘要:

我们引入了一个新的贝叶斯网络(BN)评分度量称为全球统一(GU)度量。此度量基于特定类型的默认参数先验。当BN开发者不愿意或不能够指定域特定参数先验时,这样的先验可能是有用的。GU参数先验指定与BN结构S一致的每个先验联合概率分布P被认为是同等可能的。分布P与S一致,如果P只包含由S定义的独立关系的集合。我们表明,GU度量解决了BDeu和K2贝叶斯网络评分度量的一些不良行为,这些度量也使用了特定形式的默认参数先验。一个封闭的形式公式计算GU的特殊类别的BN。有效地计算任意BN的GU仍然是一个悬而未决的问题。

英文摘要:

We introduce a new Bayesian network (BN) scoring metric called the Global Uniform (GU) metric. This metric is based on a particular type of default parameter prior. Such priors may be useful when a BN developer is not willing or able to specify domain-specific parameter priors. The GU parameter prior specifies that every prior joint probability distribution P consistent with a BN structure S is considered to be equally likely. Distribution P is consistent with S if P includes just the set of independence relations defined by S. We show that the GU metric addresses some undesirable behavior of the BDeu and K2 Bayesian network scoring metrics, which also use particular forms of default parameter priors. A closed form formula for computing GU for special classes of BNs is derived. Efficiently computing GU for an arbitrary BN remains an open problem.

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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