Tangent Graph Convolutional Network

Most Graph Convolutions (GCs) proposed in the Graph Neural Networks (GNNs) literature share the principle of computing topologically enriched node representations based on the ones of their neighbors. In this paper, we propose a novel GNN named Tangent Graph Convolutional Network (TGCN) that, in addition to the traditional GC approach, exploits a novel GC that computes node embeddings based on the differences between the attributes of a vertex and the attributes of its neighbors. This allows the GC to characterize each node's neighbor by computing its tangent space representation with respect to the considered vertex.