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Trust-embedded collaborative deep generative model for social recommendation

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Abstract

Social networks can provide massive amounts of information for communication among users and communities. The trust relationships in social networks can be utilized to reveal user preferences for improving the quality of social recommendation, which aims to mitigate information overload and provide users with the most attractive and relevant items or services. However, the data sparsity and cold-start issue degrade recommendation performance significantly. To address these issues, a novel trust-embedded collaborative deep generative model (TCDG) is proposed for exploiting multisource information (content, rating and trust) to predict ratings. TCDG employs deep generative model to unsupervisedly learn deep latent representations for item content through an inference network in latent space instead of observation space. Meanwhile, TCDG adopts probabilistic matrix factorization to map users into low-dimensional latent feature spaces by trust relationships, which can reflect users’ mutual influence on the formation of users’ opinions more accurately and learn better implicit relationships between items and users from content, rating and trust. In addition, an approach with an annealing parameter to calculate the maximum a posteriori estimates is proposed to learn model parameters. Experiments using four real-world datasets are conducted to evaluate the prediction and top-ranking performance of our model. The results indicate that TDCG has better accuracy and robustness than other methods for making recommendations.

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Notes

  1. http://www.epinions.com.

  2. http://www.trustlet.org/extended_epinions.html.

  3. http://www.douban.com.

  4. http://www.flixster.com.

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Acknowledgements

This work is supported by the National Natural Science Foundation of China (Nos 71401058, 71672023), the Program for New Century Excellent Talents in Fujian Province University (NCETFJ) (No. Z1625110) and Ministry of Science & Technology, Taiwan (MOST 108-2511-H-003-034-MY2).

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Authors and Affiliations

  1. Business School, Huaqiao University, Quanzhou, 362021, China

    Xiaoyi Deng

  2. Graduate Institute of Global Business and Strategy, National Taiwan Normal University, Taipei, 10645, Taiwan

    Yenchun Jim Wu

  3. Key Lab of Intelligent Information Processing of Chinese Academy of Sciences (CAS), Institute of Computing Technology, CAS, Beijing, 100190, China

    Fuzhen Zhuang

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  1. Xiaoyi Deng
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  2. Yenchun Jim Wu
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  3. Fuzhen Zhuang
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Correspondence to Yenchun Jim Wu.

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Deng, X., Wu, Y.J. & Zhuang, F. Trust-embedded collaborative deep generative model for social recommendation. J Supercomput 76, 8801–8829 (2020). https://doi.org/10.1007/s11227-020-03178-1

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