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Functional Output Regression with Infimal Convolution: Exploring the Huber and ε-insensitive Losses

16 Jun 2022arXiv:2206.08220archive 2025-07-28

Alex Lambert, Dimitri Bouche, Zoltan Szabo, Florence d'Alché-Buc

The focus of the paper is functional output regression (FOR) with convoluted losses. While most existing work consider the square loss setting, we leverage extensions of the Huber and the ϵ-insensitive loss (induced by infimal convolution) and propose a flexible framework capable of handling various forms of outliers and sparsity in the FOR family. We derive computationally tractable algorithms relying on duality to tackle the resulting tasks in the context of vector-valued reproducing kernel Hilbert spaces. The efficiency of the approach is demonstrated and contrasted with the classical squared loss setting on both synthetic and real-world benchmarks.

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