Authors: Yuntao Gui, Yidi Wu, Han Yang, Tatiana Jin, Boyang Li, Qihui Zhou, and James Cheng (Chinese University of Hong Kong (CUHK)) and Fan Yu (Huawei Technologies Ltd)
Abstract: Graph neural networks (GNNs) have shown to significantly improve graph analytics. Existing systems for GNN training are primarily designed for homogeneous graphs. In industry, however, most graphs are actually heterogeneous in nature (i.e., having multiple types of nodes and edges). Existing systems train a heterogeneous GNN (HetGNN) as a composition of homogeneous GNNs and thus suffer from critical limitations such as lack of memory optimization and limited operator parallelism. To address these limitations, we propose HGL– a heterogeneity-aware system for GNN training. At the core of HGL is an intermediate representation, called HIR, which provides a holistic representation for GNNs and enables cross-relation optimization for HetGNN training. We devise tailored optimizations on HIR, including graph stitching, operator fusion, and operator bundling. Experimental results verify that HGL significantly outperforms DGL and PyG.
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