now just look at the left side so you can either prefer the equations or the block diagram depending on whether you are a mathematician and computer scientist or an engineer but it's okay the block diagram now so you have data point Y that you want to reconstruct and your energy function is going to be the reconstruction error you're going to reconstruct this data point by running a latent variable through a decoder function think of it as on your own net in the simple sketch is just a simple matrix W code dictionary matrix and then