Remove irrelevant PGD

Signed-off-by: Kieran Fraser <[email protected]>

Author: kieranfraser

art/attacks/evasion/projected_gradient_descent/projected_gradient_descent_pytorch.py

@@ -269,7 +269,7 @@ def _generate_batch(
         inputs = x.to(self.estimator.device)
         targets = targets.to(self.estimator.device)
         adv_x = torch.clone(inputs)
-        momentum = torch.zeros(inputs.shape).to(self.estimator.device)
+        momentum = torch.zeros(inputs.shape)
 
         if mask is not None:
             mask = mask.to(self.estimator.device)