Comment by throwawayffffas

Ok first of all. benchmaxxing, is not a well defined term. It's a word made up by the twitter/reddit crowd to describe overfitting.

That is not overfitting, that is training for a specific task. The measure for overfitting is how well it works on previously unseen data, hence the 200 test images removed from training and validation. That set serves as a second order of validation for the researchers to check themselves they have not overfit the model to match only the training data.