try to label all the data let's save a million pictures and you're gonna label them takes too much time unlabeled data however is cheap and usually easy to collect and store so here a mixture of techniques from the unsupervised unsupervised domain can be used an example here could be as I already mentioned if you have a photo archive you might label some of the images like there's a cat in this picture people skiing topless person on the beach I don't know and from this label pictures you have a lot of unlabeled pictures and you can