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Clustering Effect Of User-Object Bipartite Network On Personalized Recommendation

Author

Listed:
  • QIANG GUO

    (Business School, University of Shanghai for Science and Technology, Shanghai 200093, P. R. China;
    Research Center of Complex Systems Science, University of Shanghai for Science and Technology, Shanghai 200093, P. R. China)

  • JIAN-GUO LIU

    (Business School, University of Shanghai for Science and Technology, Shanghai 200093, P. R. China;
    Research Center of Complex Systems Science, University of Shanghai for Science and Technology, Shanghai 200093, P. R. China)

Abstract

In this paper, the statistical property of the bipartite network, namely clustering coefficientC4is taken into account and be embedded into the collaborative filtering (CF) algorithm to improve the algorithmic accuracy and diversity. In the improved CF algorithm, the user similarity is defined by the mass diffusion process, and we argue that the object clusteringC4of the bipartite network should be considered to improve the user similarity measurement. The statistical result shows that the clustering coefficient of the MovieLens data approximately has Poisson distribution. By considering the clustering effects of object nodes, the numerical simulation on a benchmark data set shows that the accuracy of the improved algorithm, measured by the average ranking score and precision, could be improved 15.3 and 13.0%, respectively, in the optimal case. In addition, numerical results show that the improved algorithm can provide more diverse recommendation results, for example, when the recommendation list contains 20 objects, the diversity, measured by the hamming distance, is improved by 28.7%. Since all of the real recommendation data are evolving with time, this work may shed some light on the adaptive recommendation algorithm according to the statistical properties of the user-object bipartite network.

Suggested Citation

  • Qiang Guo & Jian-Guo Liu, 2010. "Clustering Effect Of User-Object Bipartite Network On Personalized Recommendation," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 21(07), pages 891-901.
    • Handle: RePEc:wsi:ijmpcx:v:21:y:2010:i:07:n:s0129183110015543
    DOI: 10.1142/S0129183110015543
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