scorer: add sample_weight support
ENH add label ranking average precision
DOC write narrative doc for label ranking average precision
DOC FIX error + wording
TST invariance testing + handle degenerate case
flake8
FIX use np.bincount
DOC friendlier narrative documentation
ENH simplify label ranking average precision (thanks @jnothman)
ENH be backward compatible for old version of scipy
Typo
pep8
DOC remove confusing mention to mean average precision
DOC improve documentatino thanks to @vene and remove mention of relevant labels
DOC more intuition about corner case
DOC add documentation to backported function
ENH less nested code
Added a parameter check on n_estimators in BaseEnsemble to raise error if it is not strictly positive.
ENH better default for test for SelectKBest and random projection
MAINT tree compute feature_importance by default