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arXiv 2408.02691cs.LGcs.AIcs.IR
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面向推荐中噪声视图的对称图对比学习

Symmetric Graph Contrastive Learning against Noisy Views for Recommendation

Software College, Northeastern University(东北大学软件学院);School of Computer Science and Engineering, Northeastern University(东北大学计算机科学与工程学院)

Chu Zhao, Enneng Yang, Yuliang Liang, Jianzhe Zhao, Guibing Guo, Xingwei Wang

AI总结:

针对图对比推荐中数据增强产生噪声视图而损害性能的问题,本文提出具有理论保证、模型无关的SGCL对称对比框架,并在三个数据集上验证其最高12.25%的相对提升。

摘要:

图对比学习(Graph Contrastive Learning,GCL)利用数据增强技术生成对比视图,并通过学习对比视图之间的一致性来提升推荐系统的准确性。然而,现有增强方法(例如直接扰动交互图,如节点/边丢弃)可能干扰原始连接并生成质量较差的对比视图,从而导致次优性能。本文将由较差数据增强造成的、与原图仅共享少量信息的视图定义为噪声视图(即与原始视图余弦相似度值低于0.1的最后20%视图)。我们通过详细实验证明,噪声视图会显著降低推荐性能。此外,我们提出了一种具有理论保证且与模型无关的对称图对比学习(Symmetric Graph Contrastive Learning,SGCL)方法来解决该问题。具体而言,我们将对称理论引入图对比学习,并据此提出一种对称形式以及能够抵抗噪声干扰的对比损失。我们提供了理论证明,表明所提出的SGCL方法对噪声视图具有较高容忍度。我们还在三个真实世界数据集上进行了大量实验以作进一步验证。实验结果表明,该方法显著提高了推荐准确性,相对于其他九个竞争模型的相对提升最高达到12.25%。这些结果凸显了本文方法的有效性。

英文摘要:

Graph Contrastive Learning (GCL) leverages data augmentation techniques to produce contrasting views, enhancing the accuracy of recommendation systems through learning the consistency between contrastive views. However, existing augmentation methods, such as directly perturbing interaction graph (e.g., node/edge dropout), may interfere with the original connections and generate poor contrasting views, resulting in sub-optimal performance. In this paper, we define the views that share only a small amount of information with the original graph due to poor data augmentation as noisy views (i.e., the last 20% of the views with a cosine similarity value less than 0.1 to the original view). We demonstrate through detailed experiments that noisy views will significantly degrade recommendation performance. Further, we propose a model-agnostic Symmetric Graph Contrastive Learning (SGCL) method with theoretical guarantees to address this issue. Specifically, we introduce symmetry theory into graph contrastive learning, based on which we propose a symmetric form and contrast loss resistant to noisy interference. We provide theoretical proof that our proposed SGCL method has a high tolerance to noisy views. Further demonstration is given by conducting extensive experiments on three real-world datasets. The experimental results demonstrate that our approach substantially increases recommendation accuracy, with relative improvements reaching as high as 12.25% over nine other competing models. These results highlight the efficacy of our method.

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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