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arXiv 1301.0604cs.LGcs.AIstat.ML
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关系数据的判别概率模型

Discriminative Probabilistic Models for Relational Data

Stanford University(斯坦福大学)

Ben Taskar, Pieter Abbeel, Daphne Koller

摘要:

在许多监督学习任务中,待标记的实体以复杂的方式彼此相关,并且它们的标记不是独立的。例如,在超文本分类中,链接页面的标签高度相关。一种标准的方法是对每个实体独立分类,忽略它们之间的相关性。最近,概率关系模型,贝叶斯网络的关系版本,被用来定义一个联合概率模型的相关实体的集合。在本文中,我们提出了一个替代框架,建立在(条件)马尔可夫网络和解决以前的方法的两个局限性。首先,无向模型不施加非循环约束,这阻碍了有向模型中许多重要关系依赖的表示。其次,无向模型非常适合区分训练,在这种情况下,我们优化了给定特征的标签的条件似然,这通常会提高分类准确性。我们展示了如何有效地训练这些模型,以及如何使用近似概率推理的学习模型的集体分类的多个相关的实体。我们提供了一个网页分类任务的实验结果,表明可以显着提高准确性建模的关系依赖。

英文摘要:

In many supervised learning tasks, the entities to be labeled are related to each other in complex ways and their labels are not independent. For example, in hypertext classification, the labels of linked pages are highly correlated. A standard approach is to classify each entity independently, ignoring the correlations between them. Recently, Probabilistic Relational Models, a relational version of Bayesian networks, were used to define a joint probabilistic model for a collection of related entities. In this paper, we present an alternative framework that builds on (conditional) Markov networks and addresses two limitations of the previous approach. First, undirected models do not impose the acyclicity constraint that hinders representation of many important relational dependencies in directed models. Second, undirected models are well suited for discriminative training, where we optimize the conditional likelihood of the labels given the features, which generally improves classification accuracy. We show how to train these models effectively, and how to use approximate probabilistic inference over the learned model for collective classification of multiple related entities. We provide experimental results on a webpage classification task, showing that accuracy can be significantly improved by modeling relational dependencies.

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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