DYNAMIC SELF-TRAINING FRAMEWORK  FOR GRAPH CONVOLUTIONAL NETWORKS
Authors: Ziang Zhou, Shenzhong Zhang, Zengfeng Huang
Keywords: self-training, semi-supervised learning, graph convolutional networks
TL;DR: Propose a novel self-training framework which performs well in few-label cases combined with GCN.
Abstract: Graph neural networks (GNN) such as GCN, GAT, MoNet have achieved state-of-the-art results on semi-supervised learning on graphs. However, when the number of labeled nodes is very small, the performances of GNNs downgrade dramatically. Self-training has proved to be effective for resolving this issue, however, the performance of self-trained GCN is still inferior to that of G2G and DGI for many settings. Moreover, additional model complexity make it more difficult to tune the hyper-parameters and do model selection. We argue that the power of self-training is still not fully explored for the node classification task. In this paper, we propose a unified end-to-end self-training framework called \emph{Dynamic Self-traning}, which generalizes and simplifies prior work. A simple instantiation of the framework based on GCN is provided and empirical results show that our framework outperforms all previous methods including GNNs, embedding based method and  self-trained GCNs by a noticeable margin. Moreover, compared with standard self-training, hyper-parameter tuning for our framework is easier.