What is the variable "a" in def attack ?

[machanic]

What is "a" that is passed in def attack(self, **a,** iterations, atk_level): ? (https://github.com/AI-secure/QEBA/blob/master/foolbox-based/foolbox/attacks/bapp_custom.py#L195) Which class refers to "a"?

[javyduck]

you can check https://github.com/AI-secure/QEBA/blob/8ee4a586a1ac5b172da92cc1c8efa9f0e543269c/foolbox-based/foolbox/attacks/bapp_custom.py#L176 => then you can see a is the "input_or_adv", namely, the original correctly classified input.