Please release the eval code

[eminorhan]

Please release the evaluation code as well. "Dirty code" is much better than no code. I'm finding it hard to parse the provided eval logs for ViT-L/16. Please just use the same eval procedure you used for ViT-B/16 and ViT-S/16 without too many tricks. I don't think anybody really cares about a ~0.1 improvement in eval accuracy obtained through hacking the lr schedule or whatever.