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From "Xiangrui Meng (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (SPARK-2341) loadLibSVMFile doesn't handle regression datasets
Date Thu, 31 Jul 2014 00:35:39 GMT

     [ https://issues.apache.org/jira/browse/SPARK-2341?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Xiangrui Meng resolved SPARK-2341.
----------------------------------

       Resolution: Fixed
    Fix Version/s: 1.1.0

Issue resolved by pull request 1663
[https://github.com/apache/spark/pull/1663]

> loadLibSVMFile doesn't handle regression datasets
> -------------------------------------------------
>
>                 Key: SPARK-2341
>                 URL: https://issues.apache.org/jira/browse/SPARK-2341
>             Project: Spark
>          Issue Type: Bug
>          Components: MLlib
>    Affects Versions: 1.0.0
>            Reporter: Eustache
>            Assignee: Sean Owen
>            Priority: Minor
>              Labels: easyfix
>             Fix For: 1.1.0
>
>
> Many datasets exist in LibSVM format for regression tasks [1] but currently the loadLibSVMFile
primitive doesn't handle regression datasets.
> More precisely, the LabelParser is either a MulticlassLabelParser or a BinaryLabelParser.
What happens then is that the file is loaded but in multiclass mode : each target value is
interpreted as a class name !
> The fix would be to write a RegressionLabelParser which converts target values to Double
and plug it into the loadLibSVMFile routine.
> [1] http://www.csie.ntu.edu.tw/~cjlin/libsvmtools/datasets/regression.html 



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