Fix Codacy Warnings (#477)

---------

Co-authored-by: Dario Coscia <dariocos99@gmail.com>

pina/optim/torch_optimizer.py

@@ -7,8 +7,20 @@ from .optimizer_interface import Optimizer
 
 
 class TorchOptimizer(Optimizer):
+    """
+    TODO
+
+    :param Optimizer: _description_
+    :type Optimizer: _type_
+    """
 
     def __init__(self, optimizer_class, **kwargs):
+        """
+        TODO
+
+        :param optimizer_class: _description_
+        :type optimizer_class: _type_
+        """
         check_consistency(optimizer_class, torch.optim.Optimizer, subclass=True)
 
         self.optimizer_class = optimizer_class
@@ -16,6 +28,12 @@ class TorchOptimizer(Optimizer):
         self._optimizer_instance = None
 
     def hook(self, parameters):
+        """
+        TODO
+
+        :param parameters: _description_
+        :type parameters: _type_
+        """
         self._optimizer_instance = self.optimizer_class(
             parameters, **self.kwargs
         )