[MRG] Fix Ridge floating point instability #8154
Merged
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Fix #7921. This fixes the failure on the manylinux wheels reported in #7921. It also fixes the conda-forge error seen in conda-forge/scikit-learn-feedstock#24 which prevented the 0.18.1 release to be available in conda-forge.
See #7921 for the full discussion.
I am still trying to figure out how to best test this on Travis. For the moment, what I saw is that you need to use conda-forge (to have an OpenBLAS built with dynamic architecture support) and set OPENBLAS_CORETYPE to Prescott. Not sure whether we want to add a build entry in the .travis.yml for this.