Test primal-dual relationship in Ridge.
More robust test for sample_weight in Ridge.
fix: remaining time not currectly computed
Merge pull request #2753 from pprett/gbrt-verbose-remaining-time

fix: remaining time not currectly computed
OPTIM MSE criterion
OPTIM more optimisation of mse
OPTIM more optimisation of mse

COSMIT
ENH use memset instead of for loop
Typo
Update what's new
Merge pull request #2745 from arjoly/mse-criterion

[MRG] Optimize mean square criterion