Github user BryanCutler commented on a diff in the pull request:
https://github.com/apache/spark/pull/7333#discussion_r34309975
--- Diff: mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala
---
@@ -88,23 +88,23 @@ private[recommendation] trait ALSParams extends
ALSModelParams with HasMaxIter w
def getRank: Int = $(rank)
/**
- * Param for number of user blocks (>= 1).
+ * Param for number of user blocks (>= 1, or -1 to auto-configure).
* Default: 10
* @group param
*/
val numUserBlocks = new IntParam(this, "numUserBlocks", "number of user
blocks",
- ParamValidators.gtEq(1))
+ ParamValidators.or(ParamValidators.gtEq(1), ParamValidators.eq(-1)))
--- End diff --
Using the proposed `ParamValidators.or` and `ParamValidators.eq` to allow
for a block size of >= 1 or -1 to auto-configure when training
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