several technologies in the past have preceded their science that explains them for example the steam engine was before the thermodynamics so it's doing better theory for ganz is something that could still be innovated on in the future so here is a taxonomy of generative models from in Goodfellas new ribs tutorial apart from Markov chain Boltzmann machines and Markov change and are the stochastic networks we have pretty much covered everything else we've covered Nate may fix Lauren and how do you exchange of variables scale the flow