[MRG] Add sample_weight parameter to cohen_kappa_score (resubmitted from #7569) #8335
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Reference Issue
Rebased, squashed and resubmitted from PR #7569 after reviews.
What does this implement/fix? Explain your changes.
This adds a sample_weight parameter to sklearn.metrics.cohen_kappa_score. The implementation simply forwards the argument to the underlying confusion_matrix call.
Any other comments?
It would be better to add a specific test in test_cohen_kappa() (here), but I don't know how to get reference kappa values for this test. Note that cohen_kappa_score is removed from METRICS_WITHOUT_SAMPLE_WEIGHT in test_common.py, which should provide additional testing, although not specific to this metric.
Finally I couldn't manage to run the full test suite locally so I'm relying on travis-ci here.