[SPARK-14661] [MLlib] trim PCAModel by required explained variance#12419

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psuszyns wants to merge 3 commits intoapache:masterfrom

psuszyns:PCA_trimmed_by_variance

Commits on Apr 15, 2016

SPARK-14661: PCA trimmed by variance
Piotr Suszyński
committed
SPARK-14661: changes after code review (implemented also for 'ml' and refactored code to be more robust)
Piotr Suszyński
committed

Commits on Apr 26, 2016

SPARK-14661: changes after code review (modifying RowMatrix.computePrincipalComponentsAndExplainedVariance instead of PCAModel mutation function)
Piotr Suszyński
committed