Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/16013#discussion_r89719801
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/optimization/NNLS.scala ---
@@ -53,8 +53,13 @@ private[spark] object NNLS {
* projected gradient method. That is, find x minimising ||Ax - b||_2
given A^T A and A^T b.
*
* We solve the problem
- * min_x 1/2 x^T ata x^T - x^T atb
- * subject to x >= 0
+ *
+ * <blockquote>
+ * $$
+ * min_x 1/2 x^T ata x^T - x^T atb
+ * $$
+ * </blockquote>
--- End diff --
- Java
- Scala (not found but manually built after changing the access modifier)
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