Improving Social Filtering Techniques Through WordNet-Based User Profiles

  • Authors:
  • Pasquale Lops;Marco Degemmis;Giovanni Semeraro

  • Affiliations:
  • Department of Informatics - University of Bari, Italy;Department of Informatics - University of Bari, Italy;Department of Informatics - University of Bari, Italy

  • Venue:
  • UM '07 Proceedings of the 11th international conference on User Modeling
  • Year:
  • 2007

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Abstract

Collaborative filtering algorithms predict the preferences of a user for an item by weighting the contributions of similarusers, called neighbors, for that item. Similarity between users is computed by comparing their rating styles, i.e. the set of ratings given on the sameitems. Unfortunately, similarity between users is computable only if they have common rated items. The main contribution of this paper is a (content-collaborative) hybrid recommender system which overcomes this limitation by computing similarity between users on the ground of their content-based profiles. Traditional keyword-based profiles are unable to capture the semanticsof user interests, due to the natural language ambiguity. A distinctive feature of the proposed technique is that a statistical model of the user interests is obtained by machine learning techniques integrated with linguistic knowledge contained in the WordNet lexical database. This model, called the semanticuser profile, is exploited by the hybrid recommender in the neighborhood formation process. The results of an experimental session in a movie recommendation scenario demonstrate the effectiveness of the proposed approach.