Latent Unexpected and Useful Recommendation
This addresses the challenge of generating unexpected recommendations for users in recommender systems, offering a novel approach that improves upon existing methods.
The paper tackles the problem of providing unexpected recommendations in recommender systems by defining unexpectedness in the latent space and developing a Latent Convex Hull method, which significantly outperforms state-of-the-art methods in unexpectedness measures while maintaining accuracy.
Providing unexpected recommendations is an important task for recommender systems. To do this, we need to start from the expectations of users and deviate from these expectations when recommending items. Previously proposed approaches model user expectations in the feature space, making them limited to the items that the user has visited or expected by the deduction of associated rules, without including the items that the user could also expect from the latent, complex and heterogeneous interactions between users, items and entities. In this paper, we define unexpectedness in the latent space rather than in the feature space and develop a novel Latent Convex Hull (LCH) method to provide unexpected recommendations. Extensive experiments on two real-world datasets demonstrate the effectiveness of the proposed model that significantly outperforms alternative state-of-the-art unexpected recommendation methods in terms of unexpectedness measures while achieving the same level of accuracy.