论文标题
基于多方面的基于信任的协作过滤
Multi-faceted Trust-based Collaborative Filtering
论文作者
论文摘要
许多协作推荐系统都利用社会相关理论来提高建议绩效。但是,他们专注于用户之间的明确关系,并遗漏了其他类型的信息,这些信息可以促进用户的全球声誉;例如,公众对审稿人质量的认可。我们有兴趣了解这些其他类型的反馈是否会改善顶级建议。为此,我们提出了一个多方面的信任模型,以将社会联系代表的本地信任与社交网络提供的各种全球信任证据相结合。我们旨在确定一般数据的数据,以使我们的模型适用于不同的案例研究。然后,我们通过将模型应用于用户对用户协作过滤(U2UCF)的一种模型来测试该模型,该模型支持评级相似性的融合,来自社会关系的本地信任以及评级预测的多方面声誉。我们在两个数据集上测试了我们的模型:Yelp One在用户之间发布通用朋友关系,但提供了不同类型的信任反馈,包括用户配置文件的认可。 LibraryThing数据集提供的反馈类型较少,但它提供了针对内容共享的更有选择的朋友关系。我们的实验结果表明,在Yelp数据集上,我们的模型的表现优于U2UCF和最先进的基于信任的推荐人,这些推荐人仅使用评级相似性和社会关系。与众不同的是,在图书馆数据集中,社会关系和评级相似性的结合可实现最佳结果。我们学到的教训是,多方面的信任可能是推荐的宝贵信息。但是,在在应用程序领域中使用它之前,必须对可用信任证据的类型和数量进行分析,以评估其对建议性能的实际影响。
Many collaborative recommender systems leverage social correlation theories to improve suggestion performance. However, they focus on explicit relations between users and they leave out other types of information that can contribute to determine users' global reputation; e.g., public recognition of reviewers' quality. We are interested in understanding if and when these additional types of feedback improve Top-N recommendation. For this purpose, we propose a multi-faceted trust model to integrate local trust, represented by social links, with various types of global trust evidence provided by social networks. We aim at identifying general classes of data in order to make our model applicable to different case studies. Then, we test the model by applying it to a variant of User-to-User Collaborative filtering (U2UCF) which supports the fusion of rating similarity, local trust derived from social relations, and multi-faceted reputation for rating prediction. We test our model on two datasets: the Yelp one publishes generic friend relations between users but provides different types of trust feedback, including user profile endorsements. The LibraryThing dataset offers fewer types of feedback but it provides more selective friend relations aimed at content sharing. The results of our experiments show that, on the Yelp dataset, our model outperforms both U2UCF and state-of-the-art trust-based recommenders that only use rating similarity and social relations. Differently, in the LibraryThing dataset, the combination of social relations and rating similarity achieves the best results. The lesson we learn is that multi-faceted trust can be a valuable type of information for recommendation. However, before using it in an application domain, an analysis of the type and amount of available trust evidence has to be done to assess its real impact on recommendation performance.