[BibTeX] [RIS]
A Flexible Class of Dependence-sensitive Multi-label Loss Functions
Type of publication: Article
Citation: wever20mlclosses
Journal: Machine Learning Journal
Year: 2021
Note: Under review at the European Conference of Machine Learning (ECML) Journal Track
URL: https://arxiv.org/abs/2011.00792
Abstract: Multi-label classification is the task of assigning a subset of labels to a given query instance. For evaluating such predictions, the set of predicted labels needs to be compared to the ground-truth label set associated with that instance, and various loss functions have been proposed for this purpose. In addition to assessing predictive accuracy, a key concern in this regard is to foster and to analyze a learner's ability to capture label dependencies. In this paper, we introduce a new class of loss functions for multi-label classification, which overcome disadvantages of commonly used losses such as Hamming and subset 0/1. To this end, we leverage the mathematical framework of non-additive measures and integrals. Roughly speaking, a non-additive measure allows for modeling the importance of correct predictions of label subsets (instead of single labels), and thereby their impact on the overall evaluation, in a flexible way - by giving full importance to single labels and the entire label set, respectively, Hamming and subset 0/1 are rather extreme in this regard. We present concrete instantiations of this class, which comprise Hamming and subset 0/1 as special cases, and which appear to be especially appealing from a modeling perspective. The assessment of multi-label classifiers in terms of these losses is illustrated in an empirical study.
Authors Hüllermeier, Eyke
Wever, Marcel
Loza Mencía, Eneldo
Fürnkranz, Johannes
Rapp, Michael