trying out some testing stuff
FIX: added logsumexp and nan_to_num to avoid underflows and NaNs
We already have the inverse at that step
Replase pinv calls with dgetri
More lapack inverting
Merge branch 'cov-speedup' of https://github.com/vene/scikit-learn into cov-speedup
Add comments on optimized precision computations.
Refactored fast_pinv without lapack calls
Compute pseudoinverse using eigendecomposition
Merge branch 'cov-speedup' of git://github.com/vene/scikit-learn into vene-cov-speedup
speed up symmetric_pinv
additional speedup: all eigenvalues are real for symmetric matrix
Vectorize singular value inversion
Remove unused import
Merge branch 'master' into cov-speedup
Merge remote-tracking branch 'VirgileFritsch/cov-speedup' into cov-speedup

Conflicts:
	sklearn/covariance/empirical_covariance_.py
	sklearn/covariance/robust_covariance.py
Merge remote-tracking branch 'jakevdp/vene-cov-speedup' into cov-speedup

Conflicts:
	sklearn/utils/extmath.py
Update and rename pinvh (by @jakevdp)
Cloned @jakevdp's pinvh tests
Remove odd-looking period in tests