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Online optimization for user-specific hybrid recommender systems

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Abstract

User-specific hybrid recommender systems aim at harnessing the power of multiple recommendation algorithms in a user-specific hybrid scenario. While research has previously focused on self-learning hybrid configurations, such systems are often too complex to take out of the lab and are seldom tested against real-world requirements. In this work, we describe a self-learning user-specific hybrid recommender system and assess its ability towards meeting a set of pre-defined requirements relevant to online recommendation scenarios: responsiveness, scalability, system transparency and user control. By integrating a client-server architectural design, the system was able to scale across multiple computing nodes in a very flexible way. A specific user-interface for a movie recommendation scenario is proposed to illustrate system transparency and user control possibilities, which integrate directly in the hybrid recommendation process. Finally, experiments were performed focusing both on weak and strong scaling scenarios on a high performance computing environment. Results showed performance to be limited only by the slowest integrated recommendation algorithm with very limited hybrid optimization overhead.

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Notes

  1. http://www.imdb.com

  2. http://www.amazon.com

  3. http://www.netflixprize.com

  4. http://www.thefilterbubble.com

  5. http://docs.python.org/2/library/xmlrpclib.html

  6. https://github.com/sidooms/Recsys-frontend

  7. http://www.ugent.be/hpc/en

  8. http://www.twitter.com

  9. http://www.mymedialite.net

  10. http://pybrain.org

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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. Online optimization for user-specific hybrid recommender systems. Multimed Tools Appl 74, 11297–11329 (2015). https://doi.org/10.1007/s11042-014-2232-7

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  • DOI: https://doi.org/10.1007/s11042-014-2232-7

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