arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1301.3899cs.LGcs.AIstat.ML
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基于模型的层次聚类

Model-Based Hierarchical Clustering

IBM Almaden Research Center(IBM阿尔马登研究中心)

Shivakumar Vaithyanathan, Byron E Dom

摘要:

我们提出了一种基于模型的层次聚类方法,通过制定一个基于贝叶斯分析的目标函数。该模型将数据组织到一个集群层次结构中,同时指定一个复杂的特征集分区,这是我们模型的关键组成部分。特征可以在每个集群中具有唯一分布,或者在一些(甚至所有)集群上具有公共分布。这些特征在其上具有这种共同分布的聚类子集对应于表示层次结构的树的节点(聚类)。我们将这个一般模型的问题,我们使用一个多项似然函数和Dirichlet先验的文档聚类。我们的算法包括一个两阶段的过程,其中我们首先执行一个平面聚类,然后是一个修改后的层次凝聚合并过程,包括确定的功能,将有共同的分布在合并后的集群。通过使用边际似然引起的正则化自动确定最佳模型结构,包括聚类的数量、树的深度和要被建模为在每个节点处具有共同分布的特征的子集。我们展示了对合成数据和真实文档集的实验结果。

英文摘要:

We present an approach to model-based hierarchical clustering by formulating an objective function based on a Bayesian analysis. This model organizes the data into a cluster hierarchy while specifying a complex feature-set partitioning that is a key component of our model. Features can have either a unique distribution in every cluster or a common distribution over some (or even all) of the clusters. The cluster subsets over which these features have such a common distribution correspond to the nodes (clusters) of the tree representing the hierarchy. We apply this general model to the problem of document clustering for which we use a multinomial likelihood function and Dirichlet priors. Our algorithm consists of a two-stage process wherein we first perform a flat clustering followed by a modified hierarchical agglomerative merging process that includes determining the features that will have common distributions over the merged clusters. The regularization induced by using the marginal likelihood automatically determines the optimal model structure including number of clusters, the depth of the tree and the subset of features to be modeled as having a common distribution at each node. We present experimental results on both synthetic data and a real document collection.

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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