arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1701.06508stat.ML
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随机模型对聚类相似性的影响

The Impact of Random Models on Clustering Similarity

Alexander J Gates, Yong-Yeol Ahn

摘要:

聚类是无监督学习的核心方法。聚类应用后,最基本的分析是对聚类结果进行定量比较。这种比较对于聚类方法的评估以及其他任务(如共识聚类)至关重要。人们常常认为,为了建立一个基线,聚类相似性应在随机聚类集合的背景下进行评估。随机聚类集成的普遍假设是置换模型,其中簇的数量和大小是固定的。然而,这种假设在实践中并不一定成立;例如,多次运行的K-means聚类返回具有固定数量的聚类的聚类,而聚类大小分布变化很大。在这里,我们得到两个聚类相似性度量(兰德指数和互信息)在两个随机聚类集合的情况下,其中集群的数量和大小各不相同的校正变量。此外,我们研究的影响,单侧比较的情况下,参考聚类。不同的随机模型的后果说明使用合成的例子,手写识别和基因表达数据。我们证明,随机模型的选择可以有一个巨大的影响相似的聚类对的排名,和评价的聚类方法相对于一个随机基线,因此,随机聚类模型的选择应仔细证明。

英文摘要:

Clustering is a central approach for unsupervised learning. After clustering is applied, the most fundamental analysis is to quantitatively compare clusterings. Such comparisons are crucial for the evaluation of clustering methods as well as other tasks such as consensus clustering. It is often argued that, in order to establish a baseline, clustering similarity should be assessed in the context of a random ensemble of clusterings. The prevailing assumption for the random clustering ensemble is the permutation model in which the number and sizes of clusters are fixed. However, this assumption does not necessarily hold in practice; for example, multiple runs of K-means clustering returns clusterings with a fixed number of clusters, while the cluster size distribution varies greatly. Here, we derive corrected variants of two clustering similarity measures (the Rand index and Mutual Information) in the context of two random clustering ensembles in which the number and sizes of clusters vary. In addition, we study the impact of one-sided comparisons in the scenario with a reference clustering. The consequences of different random models are illustrated using synthetic examples, handwriting recognition, and gene expression data. We demonstrate that the choice of random model can have a drastic impact on the ranking of similar clustering pairs, and the evaluation of a clustering method with respect to a random baseline; thus, the choice of random clustering model should be carefully justified.

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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