Github user jkbradley commented on a diff in the pull request: https://github.com/apache/spark/pull/17090#discussion_r103351299 --- Diff: mllib/src/main/scala/org/apache/spark/ml/recommendation/ALS.scala --- @@ -248,18 +248,18 @@ class ALSModel private[ml] ( @Since("1.3.0") def setPredictionCol(value: String): this.type = set(predictionCol, value) + private val predict = udf { (userFeatures: Seq[Float], itemFeatures: Seq[Float]) => --- End diff -- You could rename userFeatures, itemFeatures to be featuresA, featuresB or something to make it clear that there is no ordering here.
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