Correct codacy warnings

tests/test_optimizer.py

@@ -1,20 +1,18 @@
-
 import torch
 import pytest
 from pina import TorchOptimizer
 
 opt_list = [
-    torch.optim.Adam,
-    torch.optim.AdamW,
-    torch.optim.SGD,
-    torch.optim.RMSprop
+    torch.optim.Adam, torch.optim.AdamW, torch.optim.SGD, torch.optim.RMSprop
 ]
 
+
 @pytest.mark.parametrize("optimizer_class", opt_list)
 def test_constructor(optimizer_class):
     TorchOptimizer(optimizer_class, lr=1e-3)
 
+
 @pytest.mark.parametrize("optimizer_class", opt_list)
 def test_hook(optimizer_class):
     opt = TorchOptimizer(optimizer_class, lr=1e-3)
-    opt.hook(torch.nn.Linear(10, 10).parameters())
+    opt.hook(torch.nn.Linear(10, 10).parameters())