Active Self-Semi-Supervised Learning for Few Labeled Samples Fast Training

Faster training and fewer annotations are two key issues for applying deep models to various practical domains. Now, semi-supervised learning has achieved great success in training with few annotations. However, low-quality labeled samples produced by random sampling make it difficult to continue to reduce the number of annotations. In this paper we propose an active self-semi-supervised training framework that bootstraps semi-supervised models with good prior pseudo-labels, where the priors are obtained by label propagation over self-supervised features. Because the accuracy of the prior is not only affected by the quality of features, but also by the selection of the labeled samples. We develop active learning and label propagation strategies to obtain better prior pseudo-labels. Consequently, our framework can greatly improve the performance of models with few annotations and greatly reduce the training time. Experiments on three semi-supervised learning benchmarks demonstrate effectiveness. Our method achieves similar accuracy to standard semi-supervised approaches in about 1/3 of the training time, and even outperform them when fewer annotations are available (84.10\% in CIFAR-10 with 10 labels).