[SPARK-16473][MLLIB] Fix BisectingKMeans Algorithm failing in edge case#16355

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Commits on Dec 20, 2016

[SPARK-16473][MLLIB] Fix BisectingKMeans Algorithm failing in edge case where no children exist in updateAssignments
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Commits on Dec 21, 2016

Updated to validate children in newClusterCenters based on comments
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Commits on Dec 28, 2016

Adding test case as requested in review. Test case generates synthetic sparse data which can generate the exception user encountered.
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Fixing scala style and test case
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Commits on Jan 6, 2017

Updated code based on comments in review
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Commits on Jan 13, 2017

Updated based on latest comments - removed k, removed setters verification
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Commits on Jan 17, 2017

Added seed based on comment
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