Update app.py

app.py

@@ -143,7 +143,7 @@ def periodic_updater(controller, interval_seconds, new_model_class, stop_event):
             new_model = new_model_class()
             controller.set_model(new_model)
 
-controller = ModelController(SeparationModel())
+controller = ModelController(SeparationModel)
 stop_event = threading.Event()
 
 # Start the updater thread