arXiv Machine Learning By Huigan Zheng, Jiaojiao Zhang, Yongxiang Liu

FairMean: Promoting Fairness in Distributed Learning under Label Poisoning Attacks

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FairMean is a new approach for distributed learning that addresses the conflict between fairness and robustness to label poisoning attacks. It assigns weights to client gradients based on a bounded, nondecreasing function of local loss, giving higher weight to high‑loss clients to promote fairness while limiting the influence of poisoned clients. The method is shown to improve fairness compared to standard average‑loss minimization and to reduce accuracy variance while boosting worst‑client accuracy in experiments.

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arXiv Machine Learning
Sep 10

Approaching the Harm of Gradient Attacks While Only Flipping Labels

The paper investigates the impact of label‑flipping attacks on distributed machine learning, where an adversary can only flip a limited number of training labels. It formalizes the attack as a per‑round constrained optimization problem, derives a greedy label‑selection rule for logistic regression, and shows that this rule is provably optimal under mean aggregation. Experiments demonstrate that optimized label flipping can significantly degrade model accuracy, outperforming random flips, and that the attack transfers to other robust aggregators such as coordinate‑wise median and trimmed mean.

By Abdessamad El-Kabid, El-Mahdi El-Mhamdi