Improving accuracy of recommender system by clustering items based on stability of user similarity

Truong Khanh Quan, Ishikawa Fuyuki, Honiden Shinichi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

27 Citations (Scopus)

Abstract

Collaborative Filtering, one of the most widely used approach in Recommender System, predicts a user's rating towards an item by aggregating ratings given by users having similar preference to that user. In existing approaches, user similarity is often computed on the whole set of items. However, because the number of items is often very large, and so is the diversity among items, users who have similar preference in one category of items may have totally different judgement on items of another kind. In order to deal with this problem, we propose a method of clustering items, so that inside a cluster, similarity between users does not change significantly. After that, when predicting rating of a user towards an item, we only aggregate ratings of users who have high similarity degree with that user inside the cluster to which that item belongs. Experiments evaluating our approach are carried out on the real dataset taken from movies recommendation system of MovieLens web site. Preliminary results suggest that our approach can improve prediction accuracy compared to existing approaches.

Original languageEnglish
Title of host publicationCIMCA 2006
Subtitle of host publicationInternational Conference on Computational Intelligence for Modelling, Control and Automation, Jointly with IAWTIC 2006: International Conference on Intelligent Agents Web Technologies ...
PublisherIEEE Computer Society
ISBN (Print)0769527310, 9780769527314
DOIs
Publication statusPublished - 2006 Jan 1
EventCIMCA 2006: International Conference on Computational Intelligence for Modelling, Control and Automation, Jointly with IAWTIC 2006: International Conference on Intelligent Agents Web Technologies and International Commerce - Sydney, NSW, Australia
Duration: 2006 Nov 282006 Dec 1

Publication series

NameCIMCA 2006: International Conference on Computational Intelligence for Modelling, Control and Automation, Jointly with IAWTIC 2006: International Conference on Intelligent Agents Web Technologies ...

Conference

ConferenceCIMCA 2006: International Conference on Computational Intelligence for Modelling, Control and Automation, Jointly with IAWTIC 2006: International Conference on Intelligent Agents Web Technologies and International Commerce
CountryAustralia
CitySydney, NSW
Period06/11/2806/12/1

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ASJC Scopus subject areas

  • Computer Science(all)
  • Control and Systems Engineering

Cite this

Quan, T. K., Fuyuki, I., & Shinichi, H. (2006). Improving accuracy of recommender system by clustering items based on stability of user similarity. In CIMCA 2006: International Conference on Computational Intelligence for Modelling, Control and Automation, Jointly with IAWTIC 2006: International Conference on Intelligent Agents Web Technologies ... [4052704] (CIMCA 2006: International Conference on Computational Intelligence for Modelling, Control and Automation, Jointly with IAWTIC 2006: International Conference on Intelligent Agents Web Technologies ...). IEEE Computer Society. https://doi.org/10.1109/CIMCA.2006.123