code: def setup(self):
          
          if not self.networks():
              for _ in range(self.practice_repeats):
                  network = self.create_network()
                  network.role = "practice"
                  self.session.add(network)
              for _ in range(self.experiment_repeats):
                  network = self.create_network()
                  network.role = "experiment"
                  self.session.add(network)
              self.session.commit()
docs: Create the networks if they don't already exist.