Graph Neural Controlled Differential Equations For Collaborative Filtering

Graph Convolution Networks (GCNs) are widely considered state-of-the-art for recommendation systems. Several studies in the field of recommendation systems have attempted to apply collaborative filtering (CF) within the Neural ODE framework. These studies follow the same idea as LightGCN, which either removes the weight matrix or employs a discrete weight matrix. However, we argue that weight control is critical for neural ODE-based methods. Weight plays a crucial role in creating tailored graph convolution for each node, and employing a fixed or discrete weight prevents adjustment over time within the ODE function. This rigidity in the graph convolution reduces its adaptability, consequently hindering the performance of recommendations. In this study, to create an optimal control for Neural ODE-based recommendation, we introduce a new method called Graph Neural Controlled Differential Equations for Collaborative Filtering (CDE-CF). Our method improves the performance of the Graph ODE-based method by incorporating weight control in a continuous manner. To evaluate our approach, we conducted experiments on various datasets. The results show that our method surpasses competing baselines, including GCNs-based models and state-of-the-art Graph ODE-based methods.