arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.02452cs.LGstat.ML
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半监督学习满足因子分解:使用链图模型学习推荐

Semi-supervised Learning Meets Factorization: Learning to Recommend with Chain Graph Model

Zhejiang University(浙江大学);University of Illinois at Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校)

Chaochao Chen, Kevin C. Chang, Qibing Li, Xiaolin Zheng

摘要:

近年来,潜在因素模型(LFM)由于其良好的性能和可扩展性,在推荐系统中受到了广泛的关注。然而,现有的LFM预测缺失值的用户项目评级矩阵的基础上,只有已知的,因此,稀疏的评级矩阵总是限制了他们的性能。同时,半监督学习(SSL)提供了一种有效的方法来减轻标签(即,rating)稀疏性问题,这主要是基于对亲和图的平滑性洞察。然而,基于图的SSL在直接用于推荐时存在严重的可扩展性和图不可靠问题。在本文中,我们提出了一种新的概率链图模型(CGM)结婚SSL与LFM。建议CGM是贝叶斯网络和马尔可夫随机场的组合。贝叶斯网络被用来建模的评级生成和回归过程,和马尔可夫随机场被用来建模的置信度感知的平滑度之间的约束生成的评级。实验结果表明,我们提出的CGM显着优于国家的最先进的方法在四个评估指标,并具有更大的性能裕度时,数据稀疏性增加。

英文摘要:

Recently latent factor model (LFM) has been drawing much attention in recommender systems due to its good performance and scalability. However, existing LFMs predict missing values in a user-item rating matrix only based on the known ones, and thus the sparsity of the rating matrix always limits their performance. Meanwhile, semi-supervised learning (SSL) provides an effective way to alleviate the label (i.e., rating) sparsity problem by performing label propagation, which is mainly based on the smoothness insight on affinity graphs. However, graph-based SSL suffers serious scalability and graph unreliable problems when directly being applied to do recommendation. In this paper, we propose a novel probabilistic chain graph model (CGM) to marry SSL with LFM. The proposed CGM is a combination of Bayesian network and Markov random field. The Bayesian network is used to model the rating generation and regression procedures, and the Markov random field is used to model the confidence-aware smoothness constraint between the generated ratings. Experimental results show that our proposed CGM significantly outperforms the state-of-the-art approaches in terms of four evaluation metrics, and with a larger performance margin when data sparsity increases.

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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