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Cognitive Knowledge-aware Social Recommendation via Group-enhanced Ranking Model

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Abstract

Cognitive inspired recommendation systems have attracted increasing attention in recent years, aiming at fitting user ratings on certain items. However, the performance of recommendation approaches has been limited due to the sparsity and ambiguity of cognitive knowledge user-item ratings. Top-k recommendation has therefore been addressed and has become one of the most popular research areas. The goal of top-k recommendation is to capture the relative preferences of users and fit the optimal ranking list of items. Meanwhile, the development of social networks provides a new way to model user preferences to improve the accuracy and interpretation ability of cognition-aware recommendation models. To integrate user social information into top-k recommendation, we propose a group-enhanced ranking method based on matrix factorization. In our method, we first compute trust values between users based on user trust relationships. Then, we incorporate a trust matrix into the loss function with a social-based penalty term that reduces the distances between preference vectors of trusted users. Experimental results on two real datasets from Epinions and BaiduMovies show that the proposed method outperforms several state-of-the-art methods in terms of the normalized discounted cumulative gain (NDCG) value. Our model effectively improves the accuracy of social recommendations. We propose a novel cognitive knowledge-aware group-enhanced social recommendation method for item recommendation. The model modifies the loss function by considering the user trust relationship and group-enhanced ranking and significantly improves the performance of social recommendations.

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Acknowledgements

This work was partially supported by a grant from the Natural Science Foundation of China (No. 62006034), the Fundamental Research Funds for the Central Universities.

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Authors and Affiliations

  1. Faculty of Electronic Information and Electrical Engineering, Dalian University of Technology, Dalian, China

    Bo Xu, Hongfei Lin, Liang Yang & Kan Xu

  2. WISE Lab, School of Public Administration and Law, Dalian University of Technology, Dalian, China

    Yuan Lin

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  1. Bo Xu
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  2. Hongfei Lin
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  4. Yuan Lin
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Correspondence to Bo Xu.

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Xu, B., Lin, H., Yang, L. et al. Cognitive Knowledge-aware Social Recommendation via Group-enhanced Ranking Model. Cogn Comput 14, 1055–1067 (2022). https://doi.org/10.1007/s12559-022-10001-x

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