[SPARK-8563] [MLlib] Fixed a bug so that IndexedRowMatrix.computeSVD().U.numCols = k#6953

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lee19 wants to merge 4 commits intoapache:masterfrom

lee19:MLlibBugfix

Commits on Jun 23, 2015

[SPARK-8563][MLlib] Fixed a bug so that IndexedRowMatrix.computeSVD().U.numCols = k
lee19
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Added a unit test that validates matrix sizes of svd for [SPARK-8563][MLlib]
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Commits on Jun 26, 2015

[SPARK-8563] [MLlib] Fixed a build error.
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Commits on Jun 30, 2015

[SPARK-8563] [MLlib] Used nRows instead of numRows() to reduce a burden.
lee19
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