Tags as bridges between domains improving recommendation with tag-induced cross-domain collaborative filtering

• Published in: Proceedings of the 19th international conference on User modeling, adaption, and personalization pp. 305 - 316
• Main Authors: Shi, Yue, Larson, Martha, Hanjalic, Alan
• Format: Conference Proceeding
• Language: English
• Published: Berlin, Heidelberg Springer-Verlag 11.07.2011
• Series: ACM Conferences
• Subjects: Information systems; Information systems > Information retrieval; Information systems > Information retrieval > Retrieval tasks and goals; Information systems > Information retrieval > Retrieval tasks and goals > Document filtering; Information systems > Information retrieval > Retrieval tasks and goals > Information extraction; collaborative filtering; matrix factorization; recommender systems; cross domain collaborative filtering; tag
• ISBN: 3642223613; 9783642223617
• DOI: 10.5555/2021855.2021882

Recommender systems generally face the challenge of making predictions using only the relatively few user ratings available for a given domain. Cross-domain collaborative filtering (CF) aims to alleviate the effects of this data sparseness by transferring knowledge from other domains. We propose a novel algorithm, Tag-induced Cross-Domain Collaborative Filtering (TagCDCF), which exploits user-contributed tags that are common to multiple domains in order to establish the cross-domain links necessary for successful cross-domain CF. TagCDCF extends the state-of-the-art matrix factorization by introducing a constraint involving tag-based similarities between pairs of users and pairs of items across domains. The method requires no common users or items across domains. Using two publicly available CF data sets as different domains, we experimentally demonstrate that TagCDCF substantially outperforms other state-of-the-art single domain CF and cross-domain CF approaches. Additional experiments show that TagCDCF addresses data sparseness and illustrate the influence of the number of tags used by users in both domains.