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Linear models have shown great effectiveness and flexibility in many fields such as machine learning, signal processing and statistics. They can represent rich spaces of functions while preserving the convexity of the optimization problems where they are used, and are simple to evaluate, differentiate and integrate. However, for modeling non-negative functions, which are crucial for unsupervised learning, density estimation, or non-parametric Bayesian methods, linear models are not applicable directly. Moreover, current state-of-the-art models like generalized linear models either lead to non-convex optimization problems, or cannot be easily integrated. In this paper we provide the first model for non-negative functions which benefits from the same good properties of linear models. In particular, we prove that it admits a representer theorem and provide an efficient dual formulation for convex problems. We study its representation power, showing that the resulting space of functions is strictly richer than that of generalized linear models. Finally we extend the model and the theoretical results to functions with outputs in convex cones. The paper is complemented by an experimental evaluation of the model showing its effectiveness in terms of formulation, algorithmic derivation and practical results on the problems of density estimation, regression with heteroscedastic errors, and multiple quantile regression.
Author Information
Ulysse Marteau-Ferey (DI ENS / INRIA)
Francis Bach (INRIA - Ecole Normale Superieure)
Alessandro Rudi (INRIA, Ecole Normale Superieure)
Related Events (a corresponding poster, oral, or spotlight)
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2020 Poster: Non-parametric Models for Non-negative Functions »
Thu. Dec 10th 05:00 -- 07:00 PM Room Poster Session 5 #1674
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