probability mass and we can think of KL data KL model comma data as saying that the model should not put probability mass anywhere that the data does not put probability mass in the left it's really important to have some mass on both peaks on the right it's really important to never generate a sample in the valley between the two peaks because none of the data ever actually occurs there both of these are perfectly legitimate approaches to generative modeling and you can choose one or the other based on whichever task you are using and what