Journal
INFORMATION SCIENCES
Volume 547, Issue -, Pages 255-270Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ins.2020.08.027
Keywords
Recommender systems; One-class collaborative filtering; Bayesian personalized ranking; Pair-wise preferences
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Funding
- Samsung Research Funding & Incubation Center of Samsung Electronics [SRFC-IT1901-03]
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This paper examines the assumptions of the BPR method and proposes a new method called M-BPR to address the problems identified. Through experiments using real datasets, it is demonstrated that M-BPR effectively outperforms seven state-of-the-art OCCF methods.
In this paper, we examine the two assumptions of the Bayesian personalized ranking (BPR), a well-known pair-wise method for one-class collaborative filtering (OCCF): (1) a user with the same degree of negative preferences for all her unrated items; and (2) a user always preferring her rated items to all her unrated items. We claim that (A1) and (A2) cause recommendation errors because they do not always hold in practice. To address these problems, we first define fine-grained multi-type pair-wise preferences (PPs), which are more sophisticated than the single-type PP used in BPR. Then, we propose a novel pair-wise approach called M-BPR, which exploits multi-type PPs together in learning users' more detailed preferences. Furthermore, we refine M-BPR by employing the concept of item groups to reduce the uncertainty of a user's a single item-level preference. Through extensive experiments using four real-life datasets, we demonstrate that our approach addresses the problems of the original BPR effectively and also outperforms seven state-of-the-art OCCF (i.e., four pair-wise and three point-wise) methods significantly. (C) 2020 Elsevier Inc. All rights reserved.
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