but it's not super well understood yet but if you do it like this there the network here will give you already very very good representation and we know this because we can take a network like this and then simply train a linear classifier on top of that on a data set and achieve very very good performance and mind you you have trained it with unlabeled data right so the the network has never been trained to solve like image net classification it has simply been trained to look at the pictures and determine if you know