looks at the video up to a point and then it tries to predict the rest of the video but it pretends it doesn't know it yet and then it trends itself to predict it of course it can just wait and observe what's going to happen in the world and it trains and predicts it by just observing what happened another form of this is this it's called a mast cell supervised running you give a piece of data it's very popular in the context of natural language processing these days take a window of text a bunch of words you remove some of the words and you ask