the reconstruction error and unfortunately because if Z is high-capacity this is gonna give you a flat energy surface so the solution to this is your regular Y Z you basically add a term in the energy along that x RZ where our Z measures you know basically tells you if you are at a particular region of space that you're happy with and so basically you pay a price for making Z go outside of that region a good example of this which is familiar to many of you is our Z could be the l1 norm of Z so if you put the other one