Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/21710#discussion_r223568592
--- Diff: docs/ml-frequent-pattern-mining.md ---
@@ -85,3 +85,56 @@ Refer to the [R API docs](api/R/spark.fpGrowth.html) for
more details.
</div>
</div>
+
+## PrefixSpan
--- End diff --
is this not in the doc for branch-2.4? we might need a quick fix on the
branch then before the next RC, I think
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