Fix NaN EI/PI gradients for tiny positive std - #9

Fix NaN EI/PI gradients for tiny positive std#9

alex-rosen wants to merge 2 commits into

holgern:mainholgern/scikit-optimize:mainfrom

alex-rosen:fix/ei-pi-stability-maskalex-rosen/scikit-optimize:fix/ei-pi-stability-maskCopy head branch name to clipboard