Graph Convolutional Networks (GCNs) have shown significant improvements in semi-supervised learning on graph-structured data. Concurrently, unsupervised learning of graph embeddings has benefited from the information contained in random walks. In this paper, we propose a model: Network of GCNs (N-GCN), which marries these two lines of work. At its core, N-GCN trains multiple instances of GCNs over node pairs discovered at different distances in random walks, and learns a combination of the instance outputs which optimizes the classification objective. Our experiments show that our proposed N-GCN model improves state-of-the-art baselines on all of the challenging node classification tasks we consider: Cora, Citeseer, Pubmed, and PPI. In addition, our proposed method has other desirable properties, including generalization to recently proposed semi-supervised learning methods such as GraphSAGE, allowing us to propose N-SAGE, and resilience to adversarial input perturbations.

该研究提出了一种名为N-GCN的模型，将图卷积网络和随机游走中的信息融合，训练多个GCNs实例，并学习组合不同距离下的节点对的实例输出，实现优化分类目标。实验证明，该模型在节点分类任务上表现优异，具有良好的通用性和鲁棒性。

N-GCN：用于半监督节点分类的多尺度图卷积