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[SPARK-16469] enhanced simulate multiply #14068

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uzadude wants to merge 3 commits into from
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[SPARK-16469] enhanced simulate multiply #14068

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0126ea1
enhanced simulate multiply
uzadude Jul 6, 2016
50a4537
less verbosity
uzadude Jul 10, 2016
3ae9ac7
small nit change
uzadude Jul 10, 2016
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13 changes: 9 additions & 4 deletions mllib/src/main/scala/org/apache/spark/mllib/linalg/distributed/BlockMatrix.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -426,16 +426,21 @@ class BlockMatrix @Since("1.3.0") (
partitioner: GridPartitioner): (BlockDestinations, BlockDestinations) = {
val leftMatrix = blockInfo.keys.collect() // blockInfo should already be cached
val rightMatrix = other.blocks.keys.collect()

val rightCounterpartsHelper = rightMatrix.groupBy(_._1).mapValues(_.map(_._2))
val leftDestinations = leftMatrix.map { case (rowIndex, colIndex) =>
val rightCounterparts = rightMatrix.filter(_._1 == colIndex)
val partitions = rightCounterparts.map(b => partitioner.getPartition((rowIndex, b._2)))
val rightCounterparts = rightCounterpartsHelper.getOrElse(colIndex, Array())
val partitions = rightCounterparts.map(b => partitioner.getPartition((rowIndex, b)))
((rowIndex, colIndex), partitions.toSet)
}.toMap

val leftCounterpartsHelper = leftMatrix.groupBy(_._2).mapValues(_.map(_._1))
val rightDestinations = rightMatrix.map { case (rowIndex, colIndex) =>
val leftCounterparts = leftMatrix.filter(_._2 == rowIndex)
val partitions = leftCounterparts.map(b => partitioner.getPartition((b._1, colIndex)))
val leftCounterparts = leftCounterpartsHelper.getOrElse(rowIndex, Array())
val partitions = leftCounterparts.map(b => partitioner.getPartition((b, colIndex)))
((rowIndex, colIndex), partitions.toSet)
}.toMap

(leftDestinations, rightDestinations)
}

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