[jira] [Created] (SPARK-11507) Error thrown when using BlockMatrix.add

[Kareem Alhazred (JIRA)]

Kareem Alhazred created SPARK-11507:
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             Summary: Error thrown when using BlockMatrix.add
                 Key: SPARK-11507
                 URL: https://issues.apache.org/jira/browse/SPARK-11507
             Project: Spark
          Issue Type: Bug
          Components: MLlib
    Affects Versions: 1.5.0, 1.3.1
         Environment: Mac/local machine, EC2
Scala
            Reporter: Kareem Alhazred
            Priority: Minor


In certain situations when adding two block matrices, I get an error regarding 
colPtr and the operation fails.  Please see code below for a representative 
example.  External issue URL also includes full error message.

import org.apache.spark.mllib.linalg._
import org.apache.spark.mllib.linalg.distributed._
import org.apache.spark.{SparkConf, SparkContext}

object runAddBug {    
  def main(args: Array[String]) {
    val appName = "addbug"
    val conf = new SparkConf().setAppName(appName)
    val sc = new SparkContext(conf)

    val N = 200
    val Nbx = 10

    val diags = sc.parallelize(0 to N-1)
    val Eyecm = new CoordinateMatrix(diags.map{d =>
      MatrixEntry(d, d, 1.0)}, N, N)
    val diagsq = diags.cartesian(diags)
    val Bcm = new CoordinateMatrix(diagsq.map{dd =>
      MatrixEntry( dd._1, dd._2, 1.0*dd._1*dd._2)}, N, N)

    val Rpb = (N/Nbx).toInt
    val Cpb = (N/Nbx).toInt

    var A = Eyecm.toBlockMatrix(Rpb,Cpb)
    var B = Bcm.toBlockMatrix(Rpb,Cpb)

    var C = A.add(B)

    val entsOut = C.toCoordinateMatrix().entries
    val outLines = entsOut.map{anent =>
      anent.i.toString + "\t" + anent.j.toString + "\t" + anent.value.toString
    }
    outLines.saveAsTextFile("Outdata")
   }
}



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