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Add pure implementation of K-Nearest Neighbours (#1278)

* Pure implementation of KNN added

* Comments and test case added

* doctest added
P
Parth Paradkar committed
b1a769cf44df6f1eec740e10e393fab548e3822a
Parent: 0a7d387
Committed by Christian Clauss <cclauss@me.com> on 10/6/2019, 6:50:50 PM