scikit-learn/scikit-learn — pull request #1204 by larsmans (2012-10-04 09:37:52+00:00)
Title: MRG Use scores, not p-values, for feature selection

This solves the numerical stability issue that @amueller encountered some time ago: p-values, at least those returned by `chi2`, may contain ties even when the scores don't.

This also paves the way for score functions that are not based on significance tests, such as mutual information and infogain (whence the name of this branch, but I won't be pushing those in this PR).