arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2404.03326cs.IR
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用于推荐的定向扩散图 Transformer

A Directional Diffusion Graph Transformer for Recommendation

Zixuan Yi, Xi Wang, Iadh Ounis

AI总结:

针对隐式反馈中的假阳性与假阴性噪声,本文提出 DiffGT,通过定向各向异性扩散、线性注意力图 Transformer 去噪及个性化引导提升 top-k 推荐,并在三个基准上超过十种方法。

摘要:

在现实世界的推荐系统中,隐式收集的用户反馈虽然数量丰富,却往往包含有噪声的假阳性和假阴性交互。对用户—物品交互可能产生的错误解释,给传统的图神经推荐器带来了重大挑战。这些方法基于隐式用户—物品交互来聚合用户或物品的邻居,以准确刻画用户画像。为了在图神经推荐器中考虑并建模用户交互中可能存在的噪声,我们提出了一种新颖的 Diffusion Graph Transformer(DiffGT)模型,用于 top-k 推荐。我们的 DiffGT 模型采用扩散过程,其中包括一个前向阶段,用于逐步向隐式交互引入噪声,随后通过反向过程迭代地精炼用户隐藏偏好的表示(即去噪过程)。在所提出的方法中,鉴于用户—物品交互图中观察到的固有各向异性结构,我们在前向扩散过程中专门使用各向异性且具有方向性的高斯噪声。我们的方法不同于现有扩散模型中仅使用各向同性高斯噪声的做法。在反向扩散过程中,为了逆转先前加入的噪声影响并恢复用户的真实偏好,我们将图 Transformer 架构与线性注意力模块相结合,以有效且高效的方式对含噪的用户/物品嵌入进行去噪。此外,这种反向扩散过程还进一步由个性化信息(例如已交互物品)引导,从而能够准确估计用户对物品的偏好。我们的大量实验最终表明,在三个基准数据集上,所提出的图扩散模型优于十种现有最先进方法。

英文摘要:

In real-world recommender systems, implicitly collected user feedback, while abundant, often includes noisy false-positive and false-negative interactions. The possible misinterpretations of the user-item interactions pose a significant challenge for traditional graph neural recommenders. These approaches aggregate the users' or items' neighbours based on implicit user-item interactions in order to accurately capture the users' profiles. To account for and model possible noise in the users' interactions in graph neural recommenders, we propose a novel Diffusion Graph Transformer (DiffGT) model for top-k recommendation. Our DiffGT model employs a diffusion process, which includes a forward phase for gradually introducing noise to implicit interactions, followed by a reverse process to iteratively refine the representations of the users' hidden preferences (i.e., a denoising process). In our proposed approach, given the inherent anisotropic structure observed in the user-item interaction graph, we specifically use anisotropic and directional Gaussian noises in the forward diffusion process. Our approach differs from the sole use of isotropic Gaussian noises in existing diffusion models. In the reverse diffusion process, to reverse the effect of noise added earlier and recover the true users' preferences, we integrate a graph transformer architecture with a linear attention module to denoise the noisy user/item embeddings in an effective and efficient manner. In addition, such a reverse diffusion process is further guided by personalised information (e.g., interacted items) to enable the accurate estimation of the users' preferences on items. Our extensive experiments conclusively demonstrate the superiority of our proposed graph diffusion model over ten existing state-of-the-art approaches across three benchmark datasets.

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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