考虑同伴模仿的个体公平性分类,让相似人获得相似结果。
Beyond Independent Manipulation: Individual Fairness-aware Strategic Classification with Peer Imitation

- 引入同伴模仿机制建模个体公平下的策略性操纵
- 在真实与合成数据上提升个体公平一致性
- 适合关注公平决策中行为互动的研究者
策略性分类(SC)研究代理通过操纵自身特征以获取有利预测结果的场景。现有公平性感知的SC方法主要关注群体公平性,且通常假设代理独立响应。然而,在要求个体公平性(即相似个体应获得相似结果)时,代理的操纵行为变得相互依赖:一个代理的偏好操纵取决于其邻近群体的结果。这导致经典SC框架与公平性决策设置不匹配,独立模型无法准确刻画策略性操纵。为此,我们提出个体公平性感知的策略性分类(IFSC)框架,建模由个体公平性引发的同伴驱动型操纵——代理模仿被接受的邻近同伴以获得有利结果。IFSC将策略性操纵视为对可见成功同伴的基于相似性的模仿,并在后操纵分布下学习分类器。为应对同伴可观测性的不确定性,IFSC采用鲁棒学习过程,在操纵模拟中引入随机扰动。在合成与真实数据集上的实验表明,IFSC提升了个体公平性一致性,并缓解了模仿引起的偏差。
原文摘要 · Abstract (English)
Strategic classification (SC) investigates scenarios where agents manipulate their features to obtain favorable decisions from predictive models. Existing fairness-aware SC approaches primarily focus on group fairness and typically assume that agents respond independently. However, when individual fairness is required, ensuring similar individuals receive similar outcomes, agents' manipulation becomes interdependent: an agent's preferred manipulation depends on the neighborhoods' outcomes. This induces a mismatch between classical SC formulations and fairness-aware decision settings, where independent models no longer accurately characterize strategic manipulations. To address this issue, we introduce individual fairness-aware strategic classification (IFSC), a framework that models peer-driven manipulation arising from individual fairness, where agents imitate nearby positively decided peers to obtain favorable outcomes. IFSC characterizes strategic manipulation as similarity-based imitation toward visible accepted peers and learns classifiers under the resulting post-manipulation distributions. To account for uncertainty in peer observability, IFSC employs a robust learning process that introduces stochastic perturbations during manipulation simulation. Experiments on synthetic and real-world datasets demonstrate that IFSC improves individual-fairness consistency and mitigates imitation-induced distortions.
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