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Offline optimization for user-specific hybrid recommender systems

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Abstract

Massive availability of multimedia content has given rise to numerous recommendation algorithms that tackle the associated information overload problem. Because of their growing popularity, selecting the best one is becoming an overload problem in itself. Hybrid algorithms, combining multiple individual algorithms, offer a solution, but often require manual configuration and power only a few individual recommendation algorithms. In this work, we regard the problem of configuring hybrid recommenders as an optimization problem that can be trained in an offline context. Focusing on the switching and weighted hybridization techniques, we compare and evaluate the resulting performance boosts for hybrid configurations of up to 10 individual algorithms. Results showed significant improvement and robustness for the weighted hybridization strategy which seems promising for future self-adapting, user-specific hybrid recommender systems.

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Notes

  1. http://mahout.apache.org

  2. http://lucene.apache.org

  3. http://www.duineframework.org

  4. http://www.netflixprize.com

  5. http://mymedialite.net

  6. http://docs.scipy.org/doc/scipy/reference/optimize.html

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Acknowledgments

The described research activities were funded by a PhD grant to Simon Dooms of the Agency for Innovation by Science and Technology (IWT Vlaanderen). This work was carried out using the Stevin Supercomputer Infrastructure at Ghent University, funded by Ghent University, the Hercules Foundation and the Flemish Government - Department EWI.

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  1. Wica, iMinds-Ghent University, G. Crommenlaan 8 Box 201, 9050, Ghent, Belgium

    Simon Dooms, Toon De Pessemier & Luc Martens

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  1. Simon Dooms
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  2. Toon De Pessemier
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  3. Luc Martens
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Correspondence to Simon Dooms.

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Dooms, S., De Pessemier, T. & Martens, L. Offline optimization for user-specific hybrid recommender systems. Multimed Tools Appl 74, 3053–3076 (2015). https://doi.org/10.1007/s11042-013-1768-2

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