Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/1397#discussion_r50382898
--- Diff: docs/libs/ml/optimization.md ---
@@ -256,6 +271,79 @@ The full list of supported prediction functions can be
found [here](#prediction-
</tbody>
</table>
+#### Effective Learning Rate ##
+
+Where:
+- $j$ is the iteration number
+- $\eta_j$ is the step size on step $j$
+- $\eta_0$ is the initial step size
+- $\lambda$ is the regularization constant
+- $k$ is the decay constant
--- End diff --
In which formula is `k` actually used?
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