XML Callbacks

General purpose callbacks needed for XML TextLearner

When the target is 1 we want the input to be close to 1 to incur low loss. So when the target is 1 we need to find out how much we need to boost the pred such that its sigmoid is close to 1.

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LabelForcing

 LabelForcing (end_epoch)

Basic class handling tweaks of the training loop by changing a Learner in various events

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RunvalCallback

 RunvalCallback (mets)

Basic class handling tweaks of the training loop by changing a Learner in various events