of kind of a small volume if you want okay and the usual trick something that gmer has worked on a lot is sparse coding so it's fast coding the the regular reservations the l1 norm of Z so it's the sum of the absolute values of the components with Z and the effect of this is basically to make the Machine want to make many components of the zero which is why it's called sparse coding it's you're trying to reconstruct a data point why as the product of a sparse vector with lots of zeros in it multiplied by a matrix okay so assuming