On the Consistency of Ordinal Regression Methods - Inria - Institut national de recherche en sciences et technologies du numérique Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2015

On the Consistency of Ordinal Regression Methods

Résumé

Many of the ordinal regression models that have been proposed in the literature can be seen as methods that minimize a convex surrogate of the zero-one, absolute, or squared loss functions. A key property that allows to study the statistical implications of such approximations is that of Fisher consistency. In this paper we will characterize the Fisher consistency of a rich family of surrogate loss functions used in the context of ordinal regression, including support vector ordinal regression, ORBoosting and least absolute deviation. We will see that, for a family of surrogate loss functions that subsumes support vector ordinal regression and ORBoosting, consistency can be fully characterized by the derivative of a real-valued function at zero, as happens for convex margin-based surrogates in binary classification. We also derive excess risk bounds for a surrogate of the absolute error that generalize existing risk bounds for binary classification. Finally, our analysis suggests a novel surrogate of the squared error loss. To prove the empirical performance of such surrogate, we benchmarked it in terms of cross-validation error on 9 different datasets, where it outperforms competing approaches on 7 out of 9 datasets.
Fichier principal
Vignette du fichier
index.pdf (504.87 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-01054942 , version 1 (10-08-2014)
hal-01054942 , version 2 (27-10-2014)
hal-01054942 , version 3 (29-09-2015)
hal-01054942 , version 4 (19-06-2017)

Licence

Domaine public

Identifiants

Citer

Fabian Pedregosa, Francis Bach, Alexandre Gramfort. On the Consistency of Ordinal Regression Methods. 2015. ⟨hal-01054942v3⟩
1251 Consultations
999 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More