In quantum field theory, the pole mass of an elementary particle is the limiting value of the rest mass of a particle, as the energy scale of measurement increases.
[1][2] In quantum field theory, quantities like coupling constant and mass "run" with the energy scale of high energy physics.
The running mass of a fermion or massive boson depends on the energy scale at which the observation occurs, in a way described by a renormalization group equation (RGE) and calculated by a renormalization scheme such as the on-shell scheme or the minimal subtraction scheme.
The running mass refers to a Lagrangian parameter whose value changes with the energy scale at which the renormalization scheme is applied.
The algorithm typically relies on a perturbative calculation of the self energy.