scikit-learn/scikit-learn — pull request #802 by amueller (2012-04-27 16:34:14+00:00)
Title: MRG check if backport of sparse scipy ARPACK is needed. 

Fixes Issue #768

The arpack backport is only necessary for scipy 0.9 and below.
In scipy 0.11, it breaks. Therefore I introduced a check to see if we can import from scipy.