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Convex-constrained Sparse Additive Modeling and Its Extensions
Proceedings of the 33rd Conference on Uncertainty in Artificial Intelligence, PMLR R15:221-230, 2017.
Abstract
Sparse additive modeling is a class of effec- tive methods for performing high-dimensional nonparametric regression. In this work we show how shape constraints such as convex- ity/concavity and their extensions, can be in- tegrated into additive models. The proposed sparse difference of convex additive models (SDCAM) can estimate most continuous func- tions without any a priori smoothness assump- tion. Motivated by a characterization of dif- ference of convex functions, our method in- corporates a natural regularization functional to avoid overfitting and to reduce model com- plexity. Computationally, we develop an ef- ficient backfitting algorithm with linear per- iteration complexity. Experiments on both synthetic and real data confirm that our method is competitive against state-of-the-art sparse additive models, with improved performance in most scenarios.