ENH fast path for binary confusion matrix#15403

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jnothman wants to merge 5 commits intoscikit-learn:mainfrom

jnothman:cmspeed

Commits on Oct 30, 2019

Commits on Jan 10, 2020

Merge branch 'master' into cmspeed
jnothman
committed

Commits on Jan 20, 2020

Fix normalize handling
jnothman
committed