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- W2752948934 abstract "We formulate a supervised learning problem, referred to as continuous ranking, where a continuous real-valued label Y is assigned to an observable r.v. X taking its values in a feature space $mathcal{X}$ and the goal is to order all possible observations x in $mathcal{X}$ by means of a scoring function $s:mathcal{X}rightarrow mathbb{R}$ so that s(X) and Y tend to increase or decrease together with highest probability. This problem generalizes bi/multi-partite ranking to a certain extent and the task of finding optimal scoring functions s(x) can be naturally cast as optimization of a dedicated functional criterion, called the IROC curve here, or as maximization of the Kendall ${tau}$ related to the pair (s(X), Y ). From the theoretical side, we describe the optimal elements of this problem and provide statistical guarantees for empirical Kendall ${tau}$ maximization under appropriate conditions for the class of scoring function candidates. We also propose a recursive statistical learning algorithm tailored to empirical IROC curve optimization and producing a piecewise constant scoring function that is fully described by an oriented binary tree. Preliminary numerical experiments highlight the difference in nature between regression and continuous ranking and provide strong empirical evidence of the performance of empirical optimizers of the criteria proposed." @default.
- W2752948934 created "2017-09-15" @default.
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- W2752948934 date "2018-01-17" @default.
- W2752948934 modified "2023-10-18" @default.
- W2752948934 title "Ranking Data with Continuous Labels through Oriented Recursive Partitions" @default.
- W2752948934 hasPublicationYear "2018" @default.
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