The multi-criteria (MC) recommender system, which leverages MC rating information in a wide range of e-commerce areas, is ubiquitous nowadays. Surprisingly, although graph neural networks (GNNs) have been widely applied to develop various recommender systems due to GNN's high expressive capability in learning graph representations, it has been still unexplored how to design MC recommender systems with GNNs. In light of this, we make the first attempt towards designing a GNN-aided MC recommender system. Specifically, rather than straightforwardly adopting existing GNN-based recommendation methods, we devise a novel criteria preference-aware light graph convolution CPA-LGC method, which is capable of precisely capturing the criteria preference of users as well as the collaborative signal in complex high-order connectivities. To this end, we first construct an MC expansion graph that transforms user--item MC ratings into an expanded bipartite graph to potentially learn from the collaborative signal in MC ratings. Next, to strengthen the capability of criteria preference awareness, CPA-LGC incorporates newly characterized embeddings, including user-specific criteria-preference embeddings and item-specific criterion embeddings, into our graph convolution model. Through comprehensive evaluations using four real-world datasets, we demonstrate (a) the superiority over benchmark MC recommendation methods and benchmark recommendation methods using GNNs with tremendous gains, (b) the effectiveness of core components in CPA-LGC, and (c) the computational efficiency.

翻译：摘要：多标准推荐系统利用电子商务领域广泛存在的多标准评分信息，如今已无处不在。令人惊讶的是，尽管图神经网络凭借其在图表示学习中的高表达能力已被广泛应用于开发各类推荐系统，但如何设计基于图神经网络的多标准推荐系统仍未被探索。鉴于此，我们首次尝试设计一种图神经网络辅助的多标准推荐系统。具体而言，我们没有直接采用现有基于图神经网络的推荐方法，而是提出了一种新颖的准则偏好感知轻量图卷积方法CPA-LGC，该方法能够精确捕捉用户的准则偏好以及复杂高阶连通性中的协同信号。为此，我们首先构建了一个多标准扩展图，将用户-项目多标准评分转换为扩展二分图，以潜在学习多标准评分中的协同信号。其次，为增强准则偏好感知能力，CPA-LGC将新表征的嵌入（包括用户特定的准则偏好嵌入和项目特定的准则嵌入）纳入图卷积模型。通过使用四个真实数据集进行的全面评估，我们证明了：(a) 在基准多标准推荐方法和使用图神经网络的基准推荐方法上具有显著优势；(b) CPA-LGC核心组件的有效性；(c) 计算效率。