Github user feynmanliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/9722#discussion_r45382120
--- Diff: docs/ml-clustering.md ---
@@ -0,0 +1,31 @@
+---
+layout: global
+title: Clustering - ML
+displayTitle: <a href="ml-guide.html">ML</a> - Clustering
+---
+
+In this section, we introduce the corresponding pipeline API for
+[clustering in mllib](mllib-clustering.html).
+
+## Latent Dirichlet allocation (LDA)
+
+`LDA` is implemented as an `Estimator` that supports both `EMLDAOptimizer`
and `OnlineLDAOptimizer`,
+and generates a `LDAModel`, as the base models. Expert users may cast a
`LDAModel` generated by
--- End diff --
"`LDAModel`, as the base models" -> "`LDAModel` as the base model"
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