On the Stratification of Multi-Label Data

author: Grigorios Tsoumakas, Department of Informatics, Aristotle University of Thessaloniki
published: Oct. 3, 2011,   recorded: September 2011,   views: 4065


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Strati ed sampling is a sampling method that takes into account the existence of disjoint groups within a population and produces samples where the proportion of these groups is maintained. In single-label classi cation tasks, groups are di erentiated based on the value of the target variable. In multi-label learning tasks, however, where there are multiple target variables, it is not clear how strati ed sampling could/should be performed. This paper investigates strati cation in the multi-label data context. It considers two strati cation methods for multi-label data and empirically compares them along with random sampling on a number of datasets and based on a number of evaluation criteria. The results reveal some interesting conclusions with respect to the utility of each method for particular types of multi-label datasets.

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