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Trust-Based Local and Social Recommendation

Abstract : In this article, we propose an evolution of trust-based rec- ommender systems that only relies on local information and can be deployed on top of existing social networks. Our ap- proach takes into account friends' similarity and confidence on ratings, but limits data exchange to direct friends, in order to prevent ratings from being globally known. There- fore, calculations are limited to locally processed algorithms, privacy concerns can be taken into account and algorithms are suitable for decentralized or peer-to-peer architectures. We have implemented and evaluated our approach against five others, using the Epinions trust network. We show that local information with good default scoring strategies are sufficient to cover more users than classical collaborative filtering and trust-based recommender systems. Regarding accuracy, our approach performs better than most others, specially for cold start users, despite using less information.
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Contributor : Frédérique Laforest Connect in order to contact the contributor
Submitted on : Thursday, June 19, 2014 - 1:58:43 PM
Last modification on : Tuesday, June 1, 2021 - 2:08:07 PM


  • HAL Id : hal-01010227, version 1


Simon Meyffret, Lionel Médini, Frédérique Laforest. Trust-Based Local and Social Recommendation. RecSys 2012 Workshop on Recommender Systems and the Social Web, Oct 2012, Dublin, Ireland. pp.NA. ⟨hal-01010227⟩



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