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[SPARK-8400] [ML] Added check in ml.ALS for positive block size parameter setting #8363

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[SPARK-8400] [ML] Added check in ml.ALS for positive block size parameter setting #8363

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10 changes: 8 additions & 2 deletions mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -234,10 +234,16 @@ class ALS extends Estimator[ALSModel] with ALSParams {
def setRank(value: Int): this.type = set(rank, value)

/** @group setParam */
def setNumUserBlocks(value: Int): this.type = set(numUserBlocks, value)
def setNumUserBlocks(value: Int): this.type = {
require(value > 0, "Number of blocks must be > 0, auto-configuring with -1 is not supported.")
set(numUserBlocks, value)
}

/** @group setParam */
def setNumItemBlocks(value: Int): this.type = set(numItemBlocks, value)
def setNumItemBlocks(value: Int): this.type = {
require(value > 0, "Number of blocks must be > 0, auto-configuring with -1 is not supported.")
set(numItemBlocks, value)
}

/** @group setParam */
def setImplicitPrefs(value: Boolean): this.type = set(implicitPrefs, value)
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