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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-669) GD partial derivatives aggregation should use Arrays.copyOf instead of copying the variable
Date Sat, 10 Nov 2012 23:07:12 GMT

    [ https://issues.apache.org/jira/browse/HAMA-669?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13494792#comment-13494792
] 

Hudson commented on HAMA-669:
-----------------------------

Integrated in Hama-Nightly #733 (See [https://builds.apache.org/job/Hama-Nightly/733/])
    [HAMA-669] - fixed tests (Revision 1407730)
[HAMA-669] - fixed derivatives aggregation wrongful array copy (Revision 1407729)

     Result = SUCCESS
tommaso : 
Files : 
* /hama/trunk/examples/src/main/java/org/apache/hama/examples/GradientDescentExample.java
* /hama/trunk/examples/src/test/java/org/apache/hama/examples/GradientDescentTest.java

tommaso : 
Files : 
* /hama/trunk/ml/src/main/java/org/apache/hama/ml/regression/GradientDescentBSP.java

                
> GD partial derivatives aggregation should use Arrays.copyOf instead of copying the variable
> -------------------------------------------------------------------------------------------
>
>                 Key: HAMA-669
>                 URL: https://issues.apache.org/jira/browse/HAMA-669
>             Project: Hama
>          Issue Type: Bug
>          Components: machine learning
>            Reporter: Tommaso Teofili
>            Assignee: Tommaso Teofili
>             Fix For: 0.6.0
>
>
> GD partial derivatives aggregation should use Arrays.copyOf instead of copying the variable
thetaDelta in newTheta as this has a different semantic and effect.
> This results in sometimes different thetas on each task

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