New Objective Functions for Social Collaborative Filtering

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Noel, Joseph; Sanner, Scott; Tran, Khoi-Nguyen; Christen, Peter; Xie, Lexing; Bonilla, Edwin; Abbasnejad, Ehsan; Della Penna, Nic

Noel, Joseph; Sanner, Scott; Tran, Khoi-Nguyen; Christen, Peter; Xie, Lexing; Bonilla, Edwin; Abbasnejad, Ehsan; Della Penna, Nic


2012-04-16


Conference Material


International World Wide Web Conference (WWW)


Lyon, France


1--10


This paper examines the problem of social collaborative filtering (CF) to recommend items of interest to users in a social network setting. Unlike standard CF algorithms using relatively simple user and item features, recommendation in social networks poses the more complex problem of learning user preferences from a rich and complex set of user profile and interaction information. Many existing social CF methods have extended traditional CF matrix factorization, but have overlooked important aspects germane to the social setting. We propose a unified framework for social CF matrix factorization by introducing novel objective functions for training. Our new objective functions have three key features that address main drawbacks of existing approaches: (a) we fully exploit feature-based user similarity, (b) we permit direct learning of user-to-user information diffusion, and (c) we leverage co-preference (dis)agreement between two users to learn restricted areas of common interest. We demonstrate that optimizing the new objectives significantly outperforms a variety of CF and social CF baselines on live user trials in a custom-developed Facebook App involving data collected over two months from over 100 App users and their 34,000+ friends.


Machine learning; Collaborative Filtering; Social Recommendation


http://www2012.wwwconference.org


nicta:5415


Noel, Joseph; Sanner, Scott; Tran, Khoi-Nguyen; Christen, Peter; Xie, Lexing; Bonilla, Edwin; Abbasnejad, Ehsan; Della Penna, Nic. New Objective Functions for Social Collaborative Filtering. In: International World Wide Web Conference (WWW); Lyon, France. 2012-04-16. 1--10.



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