[D] Found top conference papers using test data for validation.

Basically title. Found 2 papers from CVPR using test data for validation. From what I can see for now that they are choosing the best model using validation (test) accuracy. There could be more things but haven't delved further into their code.

Is such thing okay to do?

Edit - I am running similar experiments using their models for my paper and am wondering should i continue using this setup?

accuracy code conference cvpr data edit machinelearning test validation