Best-of-All-Worlds Bounds for Online Learning with Feedback Graphs

Liad Erez, Tomer Koren

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Abstract:We study the online learning with feedback graphs framework introduced by Mannor and Shamir (2011), in which the feedback received by the online learner is specified by a graph $G$ over the available actions. We develop an algorithm that simultaneously achieves regret bounds of the form: $\smash{\mathcal{O}(\sqrt{\theta(G) T})}$ with adversarial losses; $\mathcal{O}(\theta(G)\operatorname{polylog}{T})$ with stochastic losses; and $\mathcal{O}(\theta(G)\operatorname{polylog}{T} + \smash{\sqrt{\theta(G) C ...
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