Serialize and save a model.

        Example:
            end_model = EndModel(...)
            end_model.train_model(...)
            end_model.save("my_end_model.pkl")

def save(self, destination, **kwargs):
        """Serialize and save a model.

        Example:
            end_model = EndModel(...)
            end_model.train_model(...)
            end_model.save("my_end_model.pkl")
        """
        with open(destination, "wb") as f:
            torch.save(self, f, **kwargs)