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arXiv 1603.04522cs.IRcs.SI
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学习推荐的最优社会依赖度

Learning Optimal Social Dependency for Recommendation

Yong Liu, Peilin Zhao, Xin Liu, Min Wu, Xiao-Li Li

摘要:

社会化推荐系统利用用户的社会关系来提高推荐的准确性。直觉上,用户倾向于信任她的社交朋友的不同子集,关于不同的场景。因此,社会化推荐的主要挑战是利用用户之间的最佳社会依赖性进行特定的推荐任务。在本文中,我们提出了一种新的推荐方法,命名为概率关系矩阵分解(PRMF),其目的是学习用户之间的最佳社会依赖关系,以提高推荐精度,有或没有用户的社会关系。具体而言,在PRMF中,假设用户的潜在特征遵循矩阵变量正态(MVN)分布。用户之间的正相关和负相关通过MVN分布的行精度矩阵来建模。此外,我们还提出了一个有效的交替算法来解决PRMF的优化问题。在真实数据集上的实验结果表明,所提出的PRMF方法优于最先进的社会推荐方法,在均方根误差(RMSE)和平均绝对误差(MAE)。

英文摘要:

Social recommender systems exploit users' social relationships to improve the recommendation accuracy. Intuitively, a user tends to trust different subsets of her social friends, regarding with different scenarios. Therefore, the main challenge of social recommendation is to exploit the optimal social dependency between users for a specific recommendation task. In this paper, we propose a novel recommendation method, named probabilistic relational matrix factorization (PRMF), which aims to learn the optimal social dependency between users to improve the recommendation accuracy, with or without users' social relationships. Specifically, in PRMF, the latent features of users are assumed to follow a matrix variate normal (MVN) distribution. The positive and negative dependency between users are modeled by the row precision matrix of the MVN distribution. Moreover, we have also proposed an efficient alternating algorithm to solve the optimization problem of PRMF. The experimental results on real datasets demonstrate that the proposed PRMF method outperforms state-of-the-art social recommendation approaches, in terms of root mean square error (RMSE) and mean absolute error (MAE).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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