Online Learning in Adversarial Lipschitz Environments

2010, Discussing articles

Odalric-Ambrym Maillard, Rémi Munos.
In ECML-PKDD’10, pages 305–320, 2010



We consider the problem of online learning in an adversarial environment when the reward functions chosen by the adversary are assumed to be Lipschitz. This setting extends previous works on linear and convex online learning. We  provide a class of algorithms with cumulative regret upper bounded by O(\sqrt{dT ln(\lambda)}) where d is the dimension of the search space, T the time horizon, and \lambda the Lipschitz constant. Efficient numerical implementations using particle methods are discussed. Applications include online supervised learning problems for both full and partial (bandit) information settings, for a large class of non-linear regressors/classifiers, such as neural networks.

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author = {{Odalric-Ambrym} Maillard and
R\'{e}mi Munos},
title = {Online Learning in Adversarial Lipschitz Environments.},
booktitle = {Machine Learning and Knowledge Discovery in Databases, European Conference,
{ECML} {PKDD} 2010, Barcelona, Spain, September 20-24, 2010, Proceedings,
Part {II}},
year = {2010},
pages = {305–320},
editor = {Jos\'{e} L. Balc\`{a}zar and
Francesco Bonchi and
Aristides Gionis and
Mich\`{e}le Sebag},
series = {Lecture Notes in Computer Science},
year = {2010},
volume = {6322},
publisher = {Springer}