arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2211.03390cs.IR
收藏

基于项目语义聚类的跨领域推荐去偏图迁移学习

Debiasing Graph Transfer Learning via Item Semantic Clustering for Cross-Domain Recommendations

Zhi Li, Daichi Amagata, Yihong Zhang, Takahiro Hara, Shuichiro Haruta, Kei Yonekawa, Mori Kurokawa

摘要:

基于深度学习的推荐系统在缺乏训练交互数据时可能导致过拟合。这种过度拟合显著降低了推荐性能。为了解决这个数据稀疏性问题,跨域推荐系统(CDRS)利用来自辅助源域的数据来促进稀疏目标域上的推荐。大多数现有的CDR依赖于重叠的用户或项目来连接域和传递知识。然而,匹配用户是一项艰巨的任务,当数据来自不同公司时可能会涉及隐私问题,导致上述CDR的应用有限。一些研究通过转移学习到的用户交互模式来开发不需要重叠用户和项目的CDRS。然而,他们忽略了域之间的用户交互模式的偏见,因此遭受一个较低的性能相比,单域推荐系统。在本文中,基于上述研究结果,我们提出了一种新的CDRS,即语义聚类增强的去偏图神经推荐系统(SCDGN),不需要重叠的用户和项目,并可以处理域的偏见。更准确地说,SCDGN语义聚类项目从两个领域,并构建一个跨域的二分图生成的项目集群和用户。然后,通过这个跨域用户聚类图将知识从源传递到目标。此外,我们设计了一个去偏图卷积层SCDGN提取无偏结构知识的跨域用户聚类图。我们在三个公共数据集和一对专有数据集上的实验结果验证了SCDGN在跨域推荐方面优于最先进模型的有效性。

英文摘要:

Deep learning-based recommender systems may lead to over-fitting when lacking training interaction data. This over-fitting significantly degrades recommendation performances. To address this data sparsity problem, cross-domain recommender systems (CDRSs) exploit the data from an auxiliary source domain to facilitate the recommendation on the sparse target domain. Most existing CDRSs rely on overlapping users or items to connect domains and transfer knowledge. However, matching users is an arduous task and may involve privacy issues when data comes from different companies, resulting in a limited application for the above CDRSs. Some studies develop CDRSs that require no overlapping users and items by transferring learned user interaction patterns. However, they ignore the bias in user interaction patterns between domains and hence suffer from an inferior performance compared with single-domain recommender systems. In this paper, based on the above findings, we propose a novel CDRS, namely semantic clustering enhanced debiasing graph neural recommender system (SCDGN), that requires no overlapping users and items and can handle the domain bias. More precisely, SCDGN semantically clusters items from both domains and constructs a cross-domain bipartite graph generated from item clusters and users. Then, the knowledge is transferred via this cross-domain user-cluster graph from the source to the target. Furthermore, we design a debiasing graph convolutional layer for SCDGN to extract unbiased structural knowledge from the cross-domain user-cluster graph. Our Experimental results on three public datasets and a pair of proprietary datasets verify the effectiveness of SCDGN over state-of-the-art models in terms of cross-domain 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。

↑