Github user dongwang218 commented on a diff in the pull request:
https://github.com/apache/spark/pull/643#discussion_r12463263
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/optimization/Updater.scala ---
@@ -128,6 +128,45 @@ class L1Updater extends Updater {
/**
* :: DeveloperApi ::
+ * Updater for Enhanced L1-RDA regularized problems.
+ * R(w) = ||w||_1
+ * Ignore the existing weights, but use average of gradient to compute new
weights
+ * and apply L1 saturated thresholding. The enhanced version has `rho`
which results
+ * in even sparse weights.
--- End diff --
this will be another pull request
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