Validation step missing in main_moco.py?

[ankuPRK]

Hey guys thanks a lot for opening up the MOCO code!

I was going through main_moco.py it doesn't really have a validation step. Does adding a simple validation on pretext task make sense, or do authors feel against it and instead suggest using some downstream task only to make the final decision like the KNN-based monitor, as given in paper for ablation of Shuffle-BN?

Adding a validation step should be easy but it is not there so I was curious/

[KaimingHe]

See #49