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https://issues.apache.org/jira/browse/SPARK-3459?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiangrui Meng closed SPARK-3459.
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Resolution: Cannot Reproduce
> MulticlassMetrics is not serializable
> -------------------------------------
>
> Key: SPARK-3459
> URL: https://issues.apache.org/jira/browse/SPARK-3459
> Project: Spark
> Issue Type: Bug
> Components: MLlib
> Reporter: Xiangrui Meng
>
> Some task closures contains member variables and hence have reference to
> itself, which causes task not serializable exception on a real cluster.
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