Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/16013#discussion_r89686375
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/optimization/NNLS.scala ---
@@ -53,8 +53,11 @@ 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
+ * subject to x >= 0
+ * }}}
--- End diff --
I think this was meant to render as LaTeX with `$$`; does that work?
Otherwise, leave it but change the last bit to "where x is nonnegative"
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