Fix error message when instantiating PGD with the l1-norm
@@ -110,8 +110,9 @@ class ProjectedGradientDescent(Attack):
raise NotImplementedError("FGM is not a good inner loop step for PGD "
" when ord=1, because ord=1 FGM changes only "
" one pixel at a time. Use the SparseL1Descent "
- " attack instead, which allows for controlling "
- " the sparsity of the gradient updates.")
+ " attack instead, which allows fine-grained "
+ " control over the sparsity of the gradient "
+ " updates.")
# Use getattr() to avoid errors in eager execution attacks
FGM = self.FGM_CLASS(
