the value of the energy in order to convert this to an actual probability distribution it started to renormalize by dividing by the sum over all the different states and that sum becomes intractable we're able to approximate it using Monte Carlo methods but those Monte Carlo methods often suffer from problems like failing to mix between different modes and in general Monte Carlo methods especially Markov chain Monte Carlo method perform very poorly in high dimensional spaces because the Markov chains break down for very large images we don't