is forward modelled by observing all the cars driving so the way we do this is that there is a camera that looks at a highway from the top and then you track every car and you extract a little rectangle around every car centered on every car and it turns with a car and so that's the world around every car and then you you can record sequences of those little things by tracking every car and that constitutes a training set the set of videos centered on every car and so you give a few frames of this thing observe frames and you train a