[GitHub] spark issue #16732: [SPARK-19368][MLlib] BlockMatrix.toIndexedRowMatrix() op...

[akaltsikis <gi...@git.apache.org>]

Github user akaltsikis commented on the issue:

    https://github.com/apache/spark/pull/16732
  
    Hey guys i was implementing that as an external function in jar to work with spark 2.1.1. Even if @uzadude improved performance of the 2.x implementation by creating 2 seperate cases for sparse and dense matrices it seems that the Blockmatrix.toCoordinateMatrix().toIndexedRowMatrix() still works faster according to my recent benchmarks.I would suggest that we put that in case of numberNonZeroPerRow<0.1 till the function for sparse matrices has better performance that the double conversion.


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