chainer.training.triggers.MinValueTrigger

class chainer.training.triggers.MinValueTrigger(key, trigger=(1, 'epoch'))

Trigger invoked when specific value becomes minimum.

For example you can use this trigger to take snapshot on the epoch the validation loss is minimum.

Parameters:

• key (str) – Key of value. The trigger fires when the value associated with this key becomes minimum.
• trigger – Trigger that decides the comparison interval between current best value and new value. This must be a tuple in the form of <int>, 'epoch' or <int>, 'iteration' which is passed to IntervalTrigger.

Methods

__call__(trainer)

Decides whether the extension should be called on this iteration.

Parameters:trainer (Trainer) – Trainer object that this trigger is associated with. The observation of this trainer is used to determine if the trigger should fire. Returns:True if the corresponding extension should be invoked in this iteration. Return type:bool