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Posted to issues@spark.apache.org by "Feynman Liang (JIRA)" <ji...@apache.org> on 2016/01/13 12:53:39 UTC
[jira] [Commented] (SPARK-12804)
ml.classification.LogisticRegression fails when FitIntercept with
same-label dataset
[ https://issues.apache.org/jira/browse/SPARK-12804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15096064#comment-15096064 ]
Feynman Liang commented on SPARK-12804:
---------------------------------------
Please assign to me
> ml.classification.LogisticRegression fails when FitIntercept with same-label dataset
> ------------------------------------------------------------------------------------
>
> Key: SPARK-12804
> URL: https://issues.apache.org/jira/browse/SPARK-12804
> Project: Spark
> Issue Type: Bug
> Components: ML
> Affects Versions: 1.6.0
> Reporter: Feynman Liang
>
> When training LogisticRegression on a dataset where the label is all 0 or all 1, an array out of bounds exception is thrown. The problematic code is
> {code}
> initialCoefficientsWithIntercept.toArray(numFeatures)
> = math.log(histogram(1) / histogram(0))
> }
> {/code}
> The correct behaviour is to short-circuit training entirely when only a single label is present (can be detected from {{labelSummarizer}}) and return a classifier which assigns all true/false with infinite weights.
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