Xiangrui Meng created SPARK-10491:
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             Summary: move RowMatrix.dspr to BLAS
                 Key: SPARK-10491
                 URL: https://issues.apache.org/jira/browse/SPARK-10491
             Project: Spark
          Issue Type: Improvement
          Components: MLlib
    Affects Versions: 1.6.0
            Reporter: Xiangrui Meng


We implemented dspr with sparse vector support in `RowMatrix`. This method is 
also used in WeightedLeastSquares and other places. It would be useful to move 
it to `linalg.BLAS`.



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