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- W3011435316 abstract "We consider a prediction problem with two experts and a forecaster. We assume that one of the experts is honest and makes correct prediction with probability $mu$ at each round. The other one is malicious, who knows true outcomes at each round and makes predictions in order to maximize the loss of the forecaster. Assuming the forecaster adopts the classical multiplicative weights algorithm, we find upper and lower bounds for the value function of the malicious expert. Our results imply that the multiplicative weights algorithm cannot resist the corruption of malicious experts. We also show that an adaptive multiplicative weights algorithm is asymptotically optimal for the forecaster, and hence more resistant to the corruption of malicious experts." @default.
- W3011435316 created "2020-03-23" @default.
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- W3011435316 date "2020-03-18" @default.
- W3011435316 modified "2023-09-27" @default.
- W3011435316 title "Malicious Experts versus the multiplicative weights algorithm in online prediction" @default.
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- W3011435316 doi "https://doi.org/10.48550/arxiv.2003.08457" @default.
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