Gets a trigger object.
Trigger object is a callable that accepts a
Trainerobject as an argument and returns a boolean value. When it returns True, various kinds of events can occur depending on the context in which the trigger is used. For example, if the trigger is passed to the
Traineras the stop trigger, the training loop breaks when the trigger returns True. If the trigger is passed to the
extend()method of a trainer, then the registered extension is invoked only when the trigger returns True.
This function returns a trigger object based on the argument. If
triggeris already a callable, it just returns the trigger. If
None, it returns a trigger that never fires. Otherwise, it passes the value to
trigger – Trigger object. It can be either an already built trigger object (i.e., a callable object that accepts a trainer object and returns a bool value), or a tuple. In latter case, the tuple is passed to
triggerif it is a callable, otherwise a
IntervalTriggerobject made from