Github user MLnick commented on a diff in the pull request:
https://github.com/apache/spark/pull/18022#discussion_r119347220
--- Diff:
mllib/src/test/scala/org/apache/spark/ml/recommendation/ALSSuite.scala ---
@@ -455,6 +487,22 @@ class ALSSuite
targetRMSE = 0.3)
}
+ test("implicit feedback regression") {
+ val trainingWithNeg = sc.parallelize(Array(Rating(0, 0, 1), Rating(1,
1, 1), Rating(0, 1, -3)))
+ val trainingWithZero = sc.parallelize(Array(Rating(0, 0, 1), Rating(1,
1, 1), Rating(0, 1, 0)))
+ val modelWithNeg =
+ trainALS(trainingWithNeg, rank = 1, maxIter = 5, regParam = 0.01,
implicitPrefs = true)
+ val modelWithZero =
+ trainALS(trainingWithZero, rank = 1, maxIter = 5, regParam = 0.01,
implicitPrefs = true)
+ val userFactorsNeg = modelWithNeg.userFactors
+ val itemFactorsNeg = modelWithNeg.itemFactors
+ val userFactorsZero = modelWithZero.userFactors
+ val itemFactorsZero = modelWithZero.itemFactors
+ userFactorsNeg.collect().foreach(arr => logInfo(s"implicit test " +
arr.mkString(" ")))
--- End diff --
Small nit here but ideally we don't usually log info during this sort of
test?
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