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https://issues.apache.org/jira/browse/SPARK-16235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15352473#comment-15352473
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Sean Owen commented on SPARK-16235:
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[~mahmoudr] but MSE is an error metric for regression, not classification. Why
would that be relevant here then?
> "evaluateEachIteration" is returning wrong results when calculated for
> classification model.
> --------------------------------------------------------------------------------------------
>
> Key: SPARK-16235
> URL: https://issues.apache.org/jira/browse/SPARK-16235
> Project: Spark
> Issue Type: Bug
> Affects Versions: 1.6.1, 1.6.2, 2.0.0
> Reporter: Mahmoud Rawas
>
> Basically within the mentioned function there is a code to map the actual
> value which supposed to be in the range of \[0,1] into the range of \[-1,1],
> in order to make it compatible with the predicted value produces by a
> classification mode.
> {code}
> val remappedData = algo match {
> case Classification => data.map(x => new LabeledPoint((x.label * 2) -
> 1, x.features))
> case _ => data
> }
> {code}
> the problem with this approach is the fact that it will calculate an
> incorrect error for an example mse will be be 4 time larger than the actual
> expected mse
> Instead we should map the predicted value into probability value in [0,1].
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