LightGCN: Simplifying and Powering Graph Convolution Network for Recommendation
Proposes LightGCN, simplifying graph convolution for recommendation to neighborhood aggregation only, dropping feature transformation and nonlinearity.
Graph Convolution Networks (GCN) are state-of-the-art for collaborative filtering, but why they work is not well understood. The authors empirically find GCN's two common designs—feature transformation and nonlinear activation—add little and even hurt training. They propose LightGCN, keeping only neighborhood aggregation: embeddings are learned by linearly propagating on the interaction graph, with the final embedding a weighted sum across layers. This simple linear model is easier to train and gives ~16% average relative improvement over NGCF under identical settings.
Based on: LightGCN: Simplifying and Powering Graph Convolution Network for Recommendation · Annual International ACM SIGIR Conference on Research and Development in Information Retrieval
Curated by Aramai Editorial
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