In Lattice QCD [1] we basically execute huge MCMC in order to sample the partition function [2] on a discretized spacetime.<p>[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Lattice_QCD" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Lattice_QCD</a><p>[2] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Path_integral_formulation#The_path_integral_and_the_partition_function" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Path_integral_formulation#The_...</a>