Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/13656#discussion_r68091611
--- 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 --
`support` should be a fraction to be consistent with the semantic of
`minSupport` in FPGrowth and PrefixSpan. There should be a compatible way to
add `support`. `Rule` is not a case class and its constructor is package
private. So this should be easy to add. Another approach is to add total number
of records in the model, so people can calculate the support easily.
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