Github user hhbyyh commented on a diff in the pull request:
https://github.com/apache/spark/pull/13656#discussion_r66927506
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/fpm/AssociationRules.scala ---
@@ -120,6 +120,13 @@ object AssociationRules {
@Since("1.5.0")
def confidence: Double = freqUnion.toDouble / freqAntecedent
+ /**
+ * Returns the support of the rule. Current implementation would
return the number of
+ * co-occurrence of antecedent and consequent.
+ */
+ @Since("2.1.0")
+ def support: Double = freqUnion.toDouble
+
--- End diff --
I suppose `freqUnion` is made as a Double on purpose for the same reason.
(flexibility for the future)
Making support a fraction now requires that we must keep the dataset size
info in `FPGrowthModel` and `AssociationRule`. Yet that would introduce API
change. I thought we should avoid breaking API between 2.0 and 2.1.
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