Github user MLnick commented on a diff in the pull request:
https://github.com/apache/spark/pull/11919#discussion_r61318645
--- Diff:
mllib/src/test/scala/org/apache/spark/ml/recommendation/ALSSuite.scala ---
@@ -541,4 +585,82 @@ object ALSSuite {
"nonnegative" -> true,
"checkpointInterval" -> 20
)
+
+ // Helper functions to generate test data we share between ALS test
suites
+
+ /**
+ * Generates random user/item factors, with i.i.d. values drawn from
U(a, b).
+ * @param size number of users/items
+ * @param rank number of features
+ * @param random random number generator
+ * @param a min value of the support (default: -1)
+ * @param b max value of the support (default: 1)
+ * @return a sequence of (ID, factors) pairs
+ */
+ private def genFactors(
--- End diff --
yup
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