Paper:
Graph neural networks (GNN) such as GCN, GAT, MoNet have achieved stateof-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 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.

Review:
The paper proposes an approach for learning graph convolutional networks for inferring labels on the nodes of a partially labeled graph  when only limited amount of labeled nodes are available.
The proposal is inspired from Graph convolution Networks with the idea of overcoming the major drawback of these models that lies of their behavior in case of limited coverage of the labeled nodes, which implies using deeper versions of the model leading at the price of what the authors call the over-smoothing problem.  
The main idea here consists in relying on self training to get a better coverage of labeled nodes enabling learning with less deep models, this translates to a simple and intuitive algorithm. Using self training is not new in GCN but the way it is used here, computing adaptively a threshold for incorporating pseudo labels and using weights according to the confidence off predictions is new.
Experimental results are reported on citation datasets and compared with many baselines show similar results as baselines when the coverage increases up to 50 labeled nodes /class, but the method brings significant improvements when the coverage is low (e.g. only few, <20, labels /class). 
Although the difference with previous approaches do not look like a huge step, the method seems to be quite justified empirically and achieve real good results wrt state of the art.