Github user vasia commented on a diff in the pull request:
https://github.com/apache/flink/pull/1980#discussion_r63890500
--- Diff: docs/apis/batch/libs/gelly.md ---
@@ -2051,6 +2052,26 @@ The algorithm takes a directed, vertex (and possibly
edge) attributed graph as i
vertex represents a group of vertices and each edge represents a group of
edges from the input graph. Furthermore, each
vertex and edge in the output graph stores the common group value and the
number of represented elements.
+### Jaccard Index
+
+#### Overview
+The Jaccard Index measures the similarity between vertex neighborhoods.
Scores range from 0.0 (no common neighbors) to
+1.0 (all neighbors are common).
+
+#### Details
+Counting common neighbors for pairs of vertices is equivalent to counting
the two-paths consisting of two edges
--- End diff --
By "two-paths" you mean triads? i.e. open triangles?
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