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Prediction against a limited adversary

Erhan Bayraktar, Ibrahim Ekren, Xin Zhang; 22(72):1−33, 2021.

Abstract

We study the problem of prediction with expert advice with adversarial corruption where the adversary can at most corrupt one expert. Using tools from viscosity theory, we characterize the long-time behavior of the value function of the game between the forecaster and the adversary. We provide lower and upper bounds for the growth rate of regret without relying on a comparison result. We show that depending on the description of regret, the limiting behavior of the game can significantly differ.

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