ReGNN: A ReRAM-based Heterogeneous Architecture for General Graph Neural Networks

Graph Neural Networks (GNNs) have both graph processing and neural network computational features. Traditional graph accelerators and NN accelerators cannot meet these dual characteristics of GNN applications simultaneously. In this work, we propose a ReRAMbased processing-in-memory (PIM) architecture called ReGNN for GNN acceleration. ReGNN is composed of analog PIM (APIM) modules for accelerating matrix vector multiplication (MVM) operations, and digital PIM (DPIM) modules for accelerating non-MVM aggregation operations. To improve data parallelism, ReGNN maps data to aggregation sub-engines based on the degree of vertices and the dimension of feature vectors. Experimental results show that ReGNN speeds up GNN inference by 228x and 8.4x, and reduces energy consumption by 305.2x and 10.5x, compared with GPU and the ReRAM-based GNN accelerator ReGraphX, respectively.