On Mon, Mar 25, 2013 at 10:57 PM, Lars Buitinck <l.j.buiti...@uva.nl> wrote:

> You mean the score rescaling at the end of section 2? What Zadrozny
> and Elkan really seem to be recommended is isotonic regression...

The question is how to deal with the *multiclass* case, which isotonic
regression cannot handle directly.
In the paper (section 4), Zadrozny and Elkan show that breaking the
multiclass problem into two-class problems,
calibrating the probabilities for each problem then normalizing works
better than other fancier approaches.

Mathieu

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