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arXiv 1808.06347cs.LGstat.ML
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一种基于分布相似性的贝叶斯网络学习正则化器

A Distribution Similarity Based Regularizer for Learning Bayesian Networks

University of British Columbia(不列颠哥伦比亚大学)

Weirui Kong, Wenyi Wang

摘要:

概率图模型通过将联合分布分解为随机变量子集上的因子来表示联合分布。在贝叶斯网络中,因子是条件概率分布。对于许多问题,这些因素之间存在着共同的信息。添加相似性限制可以被视为对模型正则化施加先验知识。通过适当的限制,学习模型通常可以更好地推广。在这项工作中,我们研究的方法,利用这种高层次的相似性,以规范的学习过程,并将其应用到非均匀介质中的波传播建模的任务。我们提出了一种新的基于分布的惩罚方法,鼓励类似的条件概率分布,而不是强迫参数是类似的明确。我们在实验中表明,我们提出的算法解决了建模波传播问题,其他基线方法是无法解决的。

英文摘要:

Probabilistic graphical models compactly represent joint distributions by decomposing them into factors over subsets of random variables. In Bayesian networks, the factors are conditional probability distributions. For many problems, common information exists among those factors. Adding similarity restrictions can be viewed as imposing prior knowledge for model regularization. With proper restrictions, learned models usually generalize better. In this work, we study methods that exploit such high-level similarities to regularize the learning process and apply them to the task of modeling the wave propagation in inhomogeneous media. We propose a novel distribution-based penalization approach that encourages similar conditional probability distribution rather than force the parameters to be similar explicitly. We show in experiment that our proposed algorithm solves the modeling wave propagation problem, which other baseline methods are not able to solve.

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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