these Y's when you have these X's because later on you're going to have X's coming in where you don't know what the Y is and that's where you want the neural network or other model to be able to give you some estimate as far as what the Y value is going to actually be unsupervised training is where we have the X's it could look just like this it would work with image data tabular or really just about anything but there is no y we're letting the neural network or whatever model it is and you know typically by