Semi-supervised Image Annotation with Parallel Graph Convolutional Networks

Automatic image annotation has increasingly exerted a tremendous fascination on researchers with the development of digital imaging in recent years. First, most works exploit the sufficient labeled data to train the models and trigger the unfavorable experimental performance in semi-supervised learning. Second, some examinations solve the semi-supervised problem only by a samples graph or tags graph, limiting in improving the annotation results owing to the incomplete data structure. To this end, we propose a method called "Semi-supervised Image Annotation with Parallel Graph Convolutional Networks (SPGCN)". This algorithm combines graph convolutional networks (GCN) with image annotation to promote annotation performance under semi-supervised learning. Furthermore, SPGCN, connecting the tags graph with the samples graph, is proposed to improve annotation results, further considering tags' distribution and features' distribution to aggregate the features. Experiments on three benchmark image annotation datasets show that our approach outperforms other existing state-of-the-art methods.