通过三元对齐对比学习,让用户、商品和评论表示更一致。
A Contrastive Framework with User, Item and Review Alignment for Recommendation
- 用评论自监督增强表征,缓解交互数据稀疏问题。
- 在多个公开数据集上显著提升推荐性能,优于基线模型。
- 适合评论丰富的场景,如电商、影评平台推荐系统。
学习用户与商品的有效潜在表示是推荐系统的核心。传统方法依赖用户-商品交互数据将两者映射到共享潜空间,但交互稀疏性常带来挑战。虽然利用用户评论可缓解稀疏性,现有评论感知推荐模型存在两大局限:一是将评论作为额外特征,但并非所有用户和商品都有评论;二是未将评论融入用户-商品空间,导致三者表示可能发散或不一致。为此,本文提出一种以评论为中心的对比对齐框架(ReCAFR),将评论融入核心学习过程,确保用户、商品和评论表示在统一空间中对齐。具体地,采用两种自监督对比策略,不仅利用评论增强缓解稀疏性,还对齐三元表示以提升鲁棒性。在多个公开基准数据集上的实证研究验证了ReCAFR的有效性与鲁棒性。
原文摘要 · Abstract (English)
Learning effective latent representations for users and items is the cornerstone of recommender systems. Traditional approaches rely on user-item interaction data to map users and items into a shared latent space, but the sparsity of interactions often poses challenges. While leveraging user reviews could mitigate this sparsity, existing review-aware recommendation models often exhibit two key limitations. First, they typically rely on reviews as additional features, but reviews are not universal, with many users and items lacking them. Second, such approaches do not integrate reviews into the user-item space, leading to potential divergence or inconsistency among user, item, and review representations. To overcome these limitations, our work introduces a Review-centric Contrastive Alignment Framework for Recommendation (ReCAFR), which incorporates reviews into the core learning process, ensuring alignment among user, item, and review representations within a unified space. Specifically, we leverage two self-supervised contrastive strategies that not only exploit review-based augmentation to alleviate sparsity, but also align the tripartite representations to enhance robustness. Empirical studies on public benchmark datasets demonstrate the effectiveness and robustness of ReCAFR.
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