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
split test_common.py into checks and test file.
move dataset generation into estimator_checks
Remove 'DeprecationWarning: using a non-integer number instead of an integer will result in an error in the future' warnings
Closes #2360. Fix tiebreaking.
DOC more intuition about corner case
DOC add documentation to backported function
some cleanups in common_test, speedup.