A new version of sci-libs/scikits_learn is available 0.18.1. Using the ebuild from version 0.17.1 with version 0.18.1 worked. Unfortunately the removed files the ebuild caused to errors. Reproducible: Always
Created attachment 463478 [details] Possible ebuild solution
In tree, https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=d71430e877ec01acffeb3f9d988c09103c0fb78a sklearn bundles joblib and funcsigs. It is considered very harmful for gentoo. I have also committed a fix for the incompatibility issues. Please test.
I tested it and it works.