"Noise" is the wrong way to think about these IMO, while robustness to noise implies robustness to a degree of perturbations, the perturbations have clearly out

"Noise" is the wrong way to think about these IMO, while robustness to noise implies robustness to a degree of perturbations, the perturbations have clearly outlined "directions" which can be visualised via so called "church plots". Seyed-Mohsen Moosavi-Dezfooli http://smoosavi.me/ http://smoosavi.me/ and the lab of Prof. Frossard have done amazing work exploring this.