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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HAMA-660) Make item cost calculation consistent in GD BSP
Date Sun, 28 Oct 2012 23:07:12 GMT

    [ https://issues.apache.org/jira/browse/HAMA-660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13485740#comment-13485740
] 

Hudson commented on HAMA-660:
-----------------------------

Integrated in Hama-Nightly #720 (See [https://builds.apache.org/job/Hama-Nightly/720/])
    [HAMA-660] - total number of items to read is pre calculated and passed to the CostFunction
(Revision 1402944)

     Result = SUCCESS
tommaso : 
Files : 
* /hama/trunk/ml/src/main/java/org/apache/hama/ml/regression/CostFunction.java
* /hama/trunk/ml/src/main/java/org/apache/hama/ml/regression/GradientDescentBSP.java
* /hama/trunk/ml/src/main/java/org/apache/hama/ml/regression/LinearRegressionModel.java
* /hama/trunk/ml/src/main/java/org/apache/hama/ml/regression/LogisticRegressionModel.java
* /hama/trunk/ml/src/main/java/org/apache/hama/ml/regression/RegressionModel.java

                
> Make item cost calculation consistent in GD BSP
> -----------------------------------------------
>
>                 Key: HAMA-660
>                 URL: https://issues.apache.org/jira/browse/HAMA-660
>             Project: Hama
>          Issue Type: Improvement
>    Affects Versions: 0.5.0
>            Reporter: Tommaso Teofili
>            Assignee: Tommaso Teofili
>             Fix For: 0.6.0
>
>
> Cost per item is calculated without knowing the total number of items which is ok from
an efficiency point of view but makes plugging of new cost functions bug prone since the total
cost is then always divided by the number of items.
> It'd be good to have a 0th superstep where total number of items is read and then it's
used in CostFunction#calculateCostPerItem

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