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arXiv 1302.6800cs.AI
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信度网络的局部部分评价

Localized Partial Evaluation of Belief Networks

University of Washington(华盛顿大学)

Denise L. Draper, Steve Hanks

摘要:

大多数通过信念网络传播证据的算法都是精确和详尽的:它们为网络中的每个节点产生精确的(点值)边际概率。然而,应用程序通常不需要网络中每个节点的信息,也不需要精确的概率。我们提出了本地化的部分评估(LPE)传播算法,它计算一个指定的查询节点的边缘概率通过检查在整个网络中的节点的一个子集的区间界限。从概念上讲,LPE忽略了网络中距离查询节点“太远”而对其值影响不大的部分。LPE具有“随时”属性,能够产生更好的解决方案(更紧密的间隔),给予更多的时间来考虑更多的网络。

英文摘要:

Most algorithms for propagating evidence through belief networks have been exact and exhaustive: they produce an exact (point-valued) marginal probability for every node in the network. Often, however, an application will not need information about every n ode in the network nor will it need exact probabilities. We present the localized partial evaluation (LPE) propagation algorithm, which computes interval bounds on the marginal probability of a specified query node by examining a subset of the nodes in the entire network. Conceptually, LPE ignores parts of the network that are "too far away" from the queried node to have much impact on its value. LPE has the "anytime" property of being able to produce better solutions (tighter intervals) given more time to consider more of the network.

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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