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arXiv 2408.09646cs.IRcs.AI
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用于缓解推荐系统中双重偏差的去偏对比表示学习

Debiased Contrastive Representation Learning for Mitigating Dual Biases in Recommender Systems

Guangxi Normal University(广西师范大学);University of South Australia(南澳大学);China University of Mining and Technology(中国矿业大学)

Zhirong Huang, Shichao Zhang, Debo Cheng, Jiuyong Li, Lin Liu, Guixian Zhang

AI总结:

针对推荐系统中流行度与从众双重偏差损害推荐效果的问题,研究构建因果图并提出DCLMDB去偏对比学习框架,在训练中通过对比学习处理两类偏差,经真实数据集验证可降偏差、提升推荐准确率与多样性。

摘要:

在推荐系统中,流行度偏差和从众偏差会过度偏袒热门物品,导致其在推荐列表中占比过高,且造成用户-物品历史数据分布失衡,进而削弱推荐效果。我们构建了一个因果图来解决这两种偏差,并描述抽象的数据生成机制。随后,我们以该因果图为指导,开发了一种名为DCLMDB的新型去偏对比学习框架(用于缓解双重偏差)。在DCLMDB中,流行度偏差和从众偏差都通过对比学习在模型训练过程中被处理,以确保用户选择和推荐物品不会受到从众性和流行度的不当影响。在Movielens-10M和Netflix两个真实世界数据集上的大量实验表明,DCLMDB能够有效降低双重偏差,同时显著提升推荐的准确性和多样性。

英文摘要:

In recommender systems, popularity and conformity biases undermine recommender effectiveness by disproportionately favouring popular items, leading to their over-representation in recommendation lists and causing an unbalanced distribution of user-item historical data. We construct a causal graph to address both biases and describe the abstract data generation mechanism. Then, we use it as a guide to develop a novel Debiased Contrastive Learning framework for Mitigating Dual Biases, called DCLMDB. In DCLMDB, both popularity bias and conformity bias are handled in the model training process by contrastive learning to ensure that user choices and recommended items are not unduly influenced by conformity and popularity. Extensive experiments on two real-world datasets, Movielens-10M and Netflix, show that DCLMDB can effectively reduce the dual biases, as well as significantly enhance the accuracy and diversity of recommendations.

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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