and you do that for like a lot of long time once the mod of the strain there are various ways in which you can evaluate the kind of features that you learn one is to take put a linear classifier as was already done in the past the other is you just take the rest net that you uncovered and instead of freezing those features what if we can actually find unit on a classification task so which is to say that instead of training a linear classifier and all possible available labels what if you're allowed to put a small model on top