Multigrid methods have proven to be an invaluable tool efficiently solve large sparse linear systems arising in the discretization of Partial Differential Equations (PDEs). Algebraic multigrid and particular adaptive algebraic approaches shown that efficiency can obtained without having resort properties PDE. Yet required setup these poses a not negligible overhead cost. Methods from machine le...

We reconstruct ghost and gluon spectral functions in $2+1$ flavor QCD with Gaussian process regression. This framework allows us to largely suppress spurious oscillations other common reconstruction artifacts by specifying generic magnitude length scale parameters the kernel function. The Euclidean propagator data are taken from lattice simulations domain wall fermions at physical point. For in...