[jira] [Assigned] (SPARK-8845) ML use of Breeze optimization: use adjustedValue not value?

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-8845?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-8845:
-----------------------------------

    Assignee: Apache Spark

> ML use of Breeze optimization: use adjustedValue not value?
> -----------------------------------------------------------
>
>                 Key: SPARK-8845
>                 URL: https://issues.apache.org/jira/browse/SPARK-8845
>             Project: Spark
>          Issue Type: Bug
>          Components: ML
>            Reporter: Joseph K. Bradley
>            Assignee: Apache Spark
>            Priority: Minor
>
> In LinearRegression and LogisticRegression, we use Breeze's optimizers (LBFGS and OWLQN).  We check the {{State.value}} to see the current objective.  However, Breeze's documentation makes it sound like {{value}} and {{adjustedValue}} differ for some optimizers, possibly including OWLQN: [https://github.com/scalanlp/breeze/blob/26faf622862e8d7a42a401aef601347aac655f2b/math/src/main/scala/breeze/optimize/FirstOrderMinimizer.scala#L36]
> If that is the case, then we should use adjustedValue instead of value.  This is relevant to [SPARK-8538] and [SPARK-8539], where we will provide the objective trace to the user.
> CC: [~dbtsai] Could you please take a look?  Thanks!



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