Document Type

Journal Article

Department/Unit

Department of Computer Science

Title

Learning user similarity and rating style for collaborative recommendation

Language

English

Abstract

Information filtering is an area getting more important as we have long been flooded with too much information, where product brokering in e-commerce is a typical example. Systems which can provide personalized product recommendations to their users (often called recommender systems) have gained a lot of interest in recent years. Collaborative filtering is one of the commonly used approaches which normally requires a definition of user similarity measure. In the literature, researchers have proposed different choices for the similarity measure using different approaches, and yet there is no guarantee for optimality. In this paper, we propose the use of machine learning techniques to learn the optimal user similarity measure as well as user rating styles for enhancing recommendation acurracy. Based on a criterion function measuring the overall prediction error, several ratings transformation functions for modeling rating styles together with their learning algorithms are derived. With the help of the formulation and the optimization framework, subjective components in user ratings are removed so that the transformed ratings can then be compared. We have evaluated our proposed methods using the EachMovie dataset and succeeded in obtaining significant improvement in recommendation accuracy when compared with the standard correlation-based algorithm.

Keywords

recommender systems, collaborative filtering, machine learning, user similarity, rating style

Publication Date

9-2004

Source Publication Title

Information Retrieval

Volume

7

Issue

3-4

Start Page

395

End Page

410

Publisher

Springer Verlag

Peer Reviewed

1

Copyright

© Kluwer Academic Publishers 2004

DOI

10.1023/B:INRT.0000011212.66249.b7

ISSN (print)

13864564

ISSN (electronic)

15737659

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