remove get attribute back
@@ -456,7 +456,6 @@ class ProjectedGradientDescent(Attack):
# Use getattr() to avoid errors in eager execution attacks
FGM = self.FGM_CLASS(
self.model,
- back=getattr(self, 'back', None),
sess=getattr(self, 'sess', None),
dtypestr=self.dtypestr)
