[SPARK-3261] [MLLIB] KMeans clusterer can return duplicate cluster centers#15450

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srowen wants to merge 7 commits intoapache:masterfrom

srowen:SPARK-3261

Commits on Oct 19, 2016

Return potentially fewer than k cluster centers in cases where k distinct centroids aren't available or aren't selected
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Deduplicate result of random selection without replacement to match behavior of parallel init
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Commits on Oct 20, 2016

Add more tests
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Commits on Oct 21, 2016

Use only distinct outputs of initial k-means || selection; update scaladoc about k everywhere; add sethah's new test
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Commits on Oct 25, 2016

Commits on Oct 29, 2016

Remove last refs to 'runs'
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