arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1207.4160cs.AI
收藏

贝叶斯网络的单调性

Monotonicity in Bayesian Networks

Institute of Information and Computing Sciences, Utrecht University(乌得勒支大学信息与计算科学研究所)

Linda C. van der Gaag, Hans L. Bodlaender, Ad Feelders

摘要:

对于许多现实生活中的贝叶斯网络,常识表明,为感兴趣的主要变量建立的输出随着可观察变量的值的增加而增加。我们定义了两个概念的单调性来捕捉这种类型的知识。我们说一个网络在分布上是保序的,如果给定特定观测值的输出变量的概率分布被给定高阶观测值的任何这样的分布随机支配;一个网络在众数上是保序的,如果给定更高观测值的概率分布具有更高的众数。我们表明,建立一个网络是否表现出任何这些性质的单调性是coNPPP-完全的一般情况下,并保持coNP-完全的多树。我们提出了一个近似算法,用于确定一个网络是否是单调分布,并说明其应用到现实生活中的肿瘤学网络。

英文摘要:

For many real-life Bayesian networks, common knowledge dictates that the output established for the main variable of interest increases with higher values for the observable variables. We define two concepts of monotonicity to capture this type of knowledge. We say that a network is isotone in distribution if the probability distribution computed for the output variable given specific observations is stochastically dominated by any such distribution given higher-ordered observations; a network is isotone in mode if a probability distribution given higher observations has a higher mode. We show that establishing whether a network exhibits any of these properties of monotonicity is coNPPP-complete in general, and remains coNP-complete for polytrees. We present an approximate algorithm for deciding whether a network is monotone in distribution and illustrate its application to a real-life network in oncology.

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。

↑