LBFGS-LS fails after a linesearch failure
Once a linsearch fails, all the directional derivatves become "NaN". Probably something about singular inverse matrix from LBFGS ? Should we stop updating it if the update is rejected ? Or throw an error ?
Once a linsearch fails, all the directional derivatves become "NaN". Probably something about singular inverse matrix from LBFGS ? Should we stop updating it if the update is rejected ? Or throw an error ?