We use Convolutional Neural Networks (CNNs) (LeCun et al., 1989) to obtain the representations of images.
we use Residual Net (ResNet) (He et al., 2016), which achieves state-of-the-art on ImageNet (Russakovsky et al., 2015) detection, ImageNet localization, COCO (Lin et al., 2014) detection, and COCO segmentation tasks.