scikit-learn/scikit-learn — pull request #1507 by arjoly (2013-01-02 16:00:26+00:00)
Title: [MRG]  mean_absolute_error multioutput regression metrics

This pull request implement three new features :
* add the metrics `mean_absolute_error`
* add multioutput support for `r2_score`, `mean_absolute_error` and `mean_square_error`

I have been unable to find a narrative documentation corresponding to those regression metrics. So I wrote it.

Reviews and comments are welcome. :-)