 Need more information about checkpoints

Does chairs.pth mean trained on FC with prerained weights of Imagenet or w/o

things.pth === chairs+things
sintel.pth  === chairs+things+sintel
kitti ==== chairs+things+sintel+kitti+hd1k
things_kitti ==== chairs+things+kitti
flow_former_small ==== small version of mix training on c+t+s+k+h11k

please provide clear details

Thanks you