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https://issues.apache.org/jira/browse/SPARK-7015?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Patrick Wendell resolved SPARK-7015.
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Resolution: Fixed
> Multiclass to Binary Reduction
> ------------------------------
>
> Key: SPARK-7015
> URL: https://issues.apache.org/jira/browse/SPARK-7015
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Reporter: Ram Sriharsha
> Assignee: Ram Sriharsha
> Fix For: 1.4.0
>
> Original Estimate: 336h
> Remaining Estimate: 336h
>
> With the new Pipeline API, it is possible to seamlessly support machine
> learning reductions as meta algorithms.
> GBDT and SVM today are binary classifiers and we can implement multi class
> classification as a One vs All, or All vs All (or even more sophisticated
> reduction) using binary classifiers as primitives.
> This JIRA is to track the creation of a reduction API for multi class
> classification.
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