MERG: MULTI-DIMENSIONAL EDGE REPRESENTATION GENERATION LAYER FOR GRAPH NEURAL NETWORKS

Edges are essential in describing relationships among nodes. While existing graphs frequently use a single-value edge to describe association between each pair of node vectors, crucial relationships may be disregarded if they are not linearly correlated, which may limit graph analysis performance. Although some recent Graph Neural Networks (GNNs) can process graphs containing multi-dimensional edge features, they cannot convert single-value edge graphs to multi-dimensional edge graphs during propagation. This paper proposes a generic Multi-dimensional Edge Representation Generation (MERG) layer that can be inserted into any GNNs for heterogeneous graph analysis. It assigns multidimensional edge features for the input single-value edge graph, describing multiple task-specific and global context-aware relationship cues between each connected node pair. Results on eight graph benchmark datasets demonstrate that inserting the MERG layer into widely-used GNNs (e.g., GatedGCN and GAT) leads to major performance improvements, resulting in state-of-the-art (SOTA) results on seven out of eight evaluated datasets. Our code is publicly available at.