def add_iter_controllers(self, *controllers):
for controller in controllers:<EOL><INDENT>if isinstance(controller, TrainingController):<EOL><INDENT>controller.bind(self)<EOL><DEDENT>self._iter_controllers.append(controller)<EOL><DEDENT>
Add iteration callbacks function (receives an argument of the trainer).
:param controllers: can be a `TrainingController` or a function.
:type funcs: list of TrainingContoller