CUB (Caltech UCSD Birds 200)

The CUB dataset comprises 200 bird species totaling 11,788 image samples, of which 50 categories are planned as unseen classes. The SUN dataset has a sample of 717 different scenes totaling 14,340 images, where 72 categories are unseen classes. The AWA2 dataset includes 50 classes of assorted animals totaling 37,322 samples, of which 10 categories are considered unseen classes.