[jira] [Resolved] (SPARK-5099) Simplify logistic loss function

["Xiangrui Meng (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-5099?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Xiangrui Meng resolved SPARK-5099.
----------------------------------
       Resolution: Fixed
    Fix Version/s: 1.3.0

Issue resolved by pull request 3899
[https://github.com/apache/spark/pull/3899]

> Simplify logistic loss function
> -------------------------------
>
>                 Key: SPARK-5099
>                 URL: https://issues.apache.org/jira/browse/SPARK-5099
>             Project: Spark
>          Issue Type: Improvement
>            Reporter: Liang-Chi Hsieh
>            Priority: Minor
>             Fix For: 1.3.0
>
>
> This is a minor pr where I think that we can simply take minus of margin, instead of subtracting margin, in the LogisticGradient.
> Mathematically, they are equal. But the modified equation is the common form of logistic loss function and so more readable. It also computes more accurate value as some quick tests show.



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