diff --git a/examples/grna_test.py b/examples/grna_test.py
index 4eec524..d8edb31 100644
--- a/examples/grna_test.py
+++ b/examples/grna_test.py
@@ -33,10 +33,11 @@ def metattack(data):
             attack_structure=True, attack_features=False, device='cpu', lambda_=0).to('cpu')
     # Attack
     n_perturbations = int(data.edge_index.size(1)/2 * 0.05)
+    n_perturbations = 1
     model.attack(features, adj, labels, idx_train, idx_unlabeled, n_perturbations=n_perturbations, ll_constraint=False)
     perturbed_adj = model.modified_adj
     perturbed_data = data.clone()
-    perturbed_data.edge_index = torch.LongTensor(perturbed_adj.nonzero())
+    perturbed_data.edge_index = torch.LongTensor(perturbed_adj.nonzero().T)
 
     return perturbed_data
 
@@ -75,6 +76,4 @@ if __name__ == '__main__':
     data = dataset[0].cpu()
     dataset[0] = metattack(data).to(device)
     ptb_acc = test_from_data(trainer, dataset, args)
-    
-
-
+    
\ No newline at end of file