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
ENH add sample_weight support to dummy classifier
ENH don't convert dataframes in grid search and cross-validation
Merge pull request #3418 from arjoly/dummy-weight

[MRG] ENH add sample_weight support to dummy classifier
DOC update what's new
DOC sample_weight attribute
FIX: Remove raw_coef_ attribute that eats up memory