added sample_weight support to K-Means and Minibatch K-means#4218

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Commits on Feb 7, 2015

added weighted kmeans/minibatch
bhsu
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Commits on Feb 8, 2015

added tests for weighted kmeans/minibatch
bhsu
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Commits on Feb 9, 2015

inlined add csr to include multp. by weight
bhsu
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Commits on Mar 12, 2015

speed improvements
bhsu
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