Prediction with Corrupted Expert Advice

24 Feb 2020Idan AmirIdan AttiasTomer KorenRoi LivniYishay Mansour

We revisit the fundamental problem of prediction with expert advice, in a setting where the environment is benign and generates losses stochastically, but the feedback observed by the learner is subject to a moderate adversarial corruption. We prove that a variant of the classical Multiplicative Weights algorithm with decreasing step sizes achieves constant regret in this setting and performs optimally in a wide range of environments, regardless of the magnitude of the injected corruption... (read more)

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