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arXiv 2602.02516cs.CYcs.AIcs.IRcs.LG
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基于用户相似性和有效性差异的个体用户公平性测量

Measuring Individual User Fairness with User Similarity and Effectiveness Disparity

University of Copenhagen(哥本哈根大学);LUT University(拉普兰塔大学)

Theresia Veronika Rampisela, Maria Maistro, Tuukka Ruotsalo, Christina Lioma

AI总结:

本文提出PUF,一种新的推荐系统个体用户公平性度量方法,同时考虑用户相似性和有效性差异。

摘要:

个体用户公平性通常被理解为对相似用户采取相似的对待方式。在推荐系统(RSs)中,存在几种用于量化个体用户公平性的评估指标。这些指标通过以下两种方式之一来评估公平性:(i) 不考虑用户相似性的RS有效性评分的差异,或(ii) 不考虑物品相关性的对相似用户推荐物品的差异。推荐效果的差异和用户相似性在公平性中都非常关键,但现有的个体用户公平性度量方法并未同时考虑两者。简而言之,当前的用户公平性评估指标实施了对公平性的不完整定义。为了填补这一空白,我们提出了配对用户不公平性(PUF),一种新的个体用户公平性评估指标,同时考虑了有效性差异和用户相似性。PUF是唯一能够表达这一重要区别的度量方法。我们实证验证了PUF在四个数据集和七个排序器上的一致性,并在变化用户相似性或有效性时表现出鲁棒性。相比之下,其他所有度量方法要么对有效性差异几乎不敏感,要么对用户相似性完全不敏感。我们贡献了第一个推荐系统评估度量方法,能够可靠地捕捉个体用户公平性中的用户相似性和有效性。我们的代码:https://github.com/theresiavr/PUF-individual-user-fairness-recsys。

英文摘要:

Individual user fairness is commonly understood as treating similar users similarly. In Recommender Systems (RSs), several evaluation measures exist for quantifying individual user fairness. These measures evaluate fairness via either: (i) the disparity in RS effectiveness scores regardless of user similarity, or (ii) the disparity in items recommended to similar users regardless of item relevance. Both disparity in recommendation effectiveness and user similarity are very important in fairness, yet no existing individual user fairness measure simultaneously accounts for both. In brief, current user fairness evaluation measures implement a largely incomplete definition of fairness. To fill this gap, we present Pairwise User unFairness (PUF), a novel evaluation measure of individual user fairness that considers both effectiveness disparity and user similarity. PUF is the only measure that can express this important distinction. We empirically validate that PUF does this consistently across 4 datasets and 7 rankers, and robustly when varying user similarity or effectiveness. In contrast, all other measures are either almost insensitive to effectiveness disparity or completely insensitive to user similarity. We contribute the first RS evaluation measure to reliably capture both user similarity and effectiveness in individual user fairness. Our code: https://github.com/theresiavr/PUF-individual-user-fairness-recsys.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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