data store in the npy file

Thanks for your great work!
I want to know what data is stored in the npy file, such as [mya_100-10-ov.npy](https://github.com/fcdl94/CoMFormer/blob/master/datasets/mya_100-10-ov.npy).

Is it used to record the usage of images at each step? For example, in the ade20k 100-50 task, does `[1, 0]` mean that this image is used in step 0 but not used in step 1? Is my inference correct?"
