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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2017/08/29 10:14:00 UTC

[jira] [Assigned] (SPARK-21862) Add overflow check in PCA

     [ https://issues.apache.org/jira/browse/SPARK-21862?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-21862:
------------------------------------

    Assignee: Apache Spark

> Add overflow check in PCA
> -------------------------
>
>                 Key: SPARK-21862
>                 URL: https://issues.apache.org/jira/browse/SPARK-21862
>             Project: Spark
>          Issue Type: Improvement
>          Components: ML
>    Affects Versions: 2.2.0, 2.3.0
>            Reporter: Weichen Xu
>            Assignee: Apache Spark
>            Priority: Minor
>
> We should add overflow check in PCA, otherwise it is possible to throw `NegativeArraySizeException` when `k` and `numFeatures` are too large.
> The overflow checking formula is here:
> https://github.com/scalanlp/breeze/blob/master/math/src/main/scala/breeze/linalg/functions/svd.scala#L87



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