Appendix: A Datasets

Several benchmark multi-view datasets are adopted in our experiments. There are 948 news articles covering 416 different news stories. Among them, 169 news were reported in all three sources and each news was annotated with one of six topical labels: business, health, politics, entertainment, sport, and technology. MSRC is comprised of 240 images in eight classes. We select seven classes with each class containing 30 images.