Regularizing Knowledge Transfer in Recommendation With Tag-Inferred Correlation

TitleRegularizing Knowledge Transfer in Recommendation With Tag-Inferred Correlation
Publication TypeInternational Journal
Year of PublicationIn progress
AuthorsP. Hao, G. Zhang, L. Martínez and J. Lu
JournalIEEE Transactions on Cybernetics
ISSN Number2168-2267
Keywordscollaborative filtering (cf), data sparsity, Recommender systems, social tags, transfer learning

Traditional recommender systems suffer from the data sparsity problem. However, user knowledge acquired in one domain can be transferred and exploited in several other relevant domains. In this context, cross-domain recommender systems have been proposed to create a new and effective recommendation paradigm in which to exploit rich data from auxiliary  domains to assist recommendations in a target domain. Before knowledge transfer takes place, building reliable and concrete domain correlation is the key ensuring that only relevant knowledge will be transferred. Social tags are used to explicitly link different domains, especially when neither users nor items overlap. However, existing models only exploit a subset of tags that are shared by heterogeneous domains. In this paper, we propose a complete tag-induced cross-domain recommendation (CTagCDR) model, which infers interdomain and intradomain correlations from tagging history and applies the learned structural constraints to regularize joint matrix factorization. Compared to similar models, CTagCDR is able to fully explore knowledge encoded in both shared and domain-specific tags.We demonstrate the performance of our proposed model on three public datasets and compare it with five state-of-the-art single and cross-domain recommendation approaches. The results show that CTagCDR
works well in both rating prediction and item recommendation tasks, and can effectively improve recommendation performance

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