Stepsize for PGD attacks

Hello,
Q.1
is it possible to give list of epsilon for LinfPGD attacks? I wanted to test how a number of steps affect the result in terms of PGD attacks.
Q. 2
I would like to know how we could decide on stepsize which is abs_stepsize? I read the documents but seems like no explanation about it. Is there a strategy for deciding on stepsize?

My code:

eps = [0, 0.1/255, 0.3/255, 1/255, 4/255]
stepsize = [i/4 for i in eps]
steps= args.steps
attack = LinfPGD(rel_stepsize=0.033, abs_stepsize=stepsize, steps=steps, random_start=True)