Github user dongjoon-hyun commented on a diff in the pull request:
https://github.com/apache/spark/pull/23072#discussion_r239224498
--- Diff: docs/ml-clustering.md ---
@@ -265,3 +265,44 @@ Refer to the [R API
docs](api/R/spark.gaussianMixture.html) for more details.
</div>
</div>
+
+## Power Iteration Clustering (PIC)
+
+Power Iteration Clustering (PIC) is a scalable graph clustering algorithm
+developed by <a
href=http://www.cs.cmu.edu/~frank/papers/icml2010-pic-final.pdf>Lin and
Cohen</a>.
--- End diff --
It seems that `<a>` tag doesn't work here. Maybe, could you check the
generated document and try `[Lin and
Cohen](http://www.cs.cmu.edu/~frank/papers/icml2010-pic-final.pdf)` instead?
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