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arXiv 2402.13495cs.IR
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一个嵌入能适配所有用户吗?一种面向提升用户兴趣多样性公平性的多兴趣学习范式

Can One Embedding Fit All? A Multi-Interest Learning Paradigm Towards Improving User Interest Diversity Fairness

Yuying Zhao, Minghua Xu, Huiyuan Chen, Yuzhong Chen, Yiwei Cai, Rashidul Islam, Yu Wang, Tyler Derr

AI总结:

本文针对推荐系统中兴趣广泛的用户获得推荐质量较低的不公平问题,提出一种基于多虚拟兴趣嵌入和中心嵌入聚合的多兴趣学习框架,以改善公平性与效用的权衡。

摘要:

推荐系统(RSs)由于在捕捉用户兴趣方面具有卓越能力,已在各个领域获得广泛应用。然而,用户兴趣的复杂性和细微性跨越了广泛的多样性范围,这对提供公平的推荐构成了重大挑战。在实践中,用户偏好差异显著;一些用户对某些物品类别表现出明显偏好,而另一些用户则对多样化的类别具有广泛兴趣。尽管期望所有用户都能获得高质量推荐,但推荐系统在应对这种差异化的兴趣多样性方面的有效性仍未得到充分探索。\n在这项工作中,我们研究了具有不同兴趣多样性水平的用户是否被公平对待。我们的实证实验揭示了一种固有的差异:兴趣更广泛的用户往往获得较低质量的推荐。为了缓解这一问题,我们提出了一种多兴趣框架,该框架使用多个(虚拟)兴趣嵌入而非单一嵌入来表示用户。具体而言,该框架由堆叠的多兴趣表示层组成,其中包括一个兴趣嵌入生成器,该生成器从共享参数中推导出虚拟兴趣,以及一个中心嵌入聚合器,用于促进多跳聚合。实验证明了该框架在各种数据集和骨干网络上实现公平性与效用之间更好权衡的有效性。

英文摘要:

Recommender systems (RSs) have gained widespread applications across various domains owing to the superior ability to capture users' interests. However, the complexity and nuanced nature of users' interests, which span a wide range of diversity, pose a significant challenge in delivering fair recommendations. In practice, user preferences vary significantly; some users show a clear preference toward certain item categories, while others have a broad interest in diverse ones. Even though it is expected that all users should receive high-quality recommendations, the effectiveness of RSs in catering to this disparate interest diversity remains under-explored. In this work, we investigate whether users with varied levels of interest diversity are treated fairly. Our empirical experiments reveal an inherent disparity: users with broader interests often receive lower-quality recommendations. To mitigate this, we propose a multi-interest framework that uses multiple (virtual) interest embeddings rather than single ones to represent users. Specifically, the framework consists of stacked multi-interest representation layers, which include an interest embedding generator that derives virtual interests from shared parameters, and a center embedding aggregator that facilitates multi-hop aggregation. Experiments demonstrate the effectiveness of the framework in achieving better trade-off between fairness and utility across various datasets and backbones.

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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