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Posted to issues@spark.apache.org by "Apache Spark (JIRA)" <ji...@apache.org> on 2015/07/07 06:01:04 UTC

[jira] [Commented] (SPARK-3164) Store DecisionTree Split.categories as Set

    [ https://issues.apache.org/jira/browse/SPARK-3164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14616137#comment-14616137 ] 

Apache Spark commented on SPARK-3164:
-------------------------------------

User 'rekhajoshm' has created a pull request for this issue:
https://github.com/apache/spark/pull/7251

> Store DecisionTree Split.categories as Set
> ------------------------------------------
>
>                 Key: SPARK-3164
>                 URL: https://issues.apache.org/jira/browse/SPARK-3164
>             Project: Spark
>          Issue Type: Improvement
>          Components: MLlib
>            Reporter: Joseph K. Bradley
>            Priority: Trivial
>
> Improvement: computation
> For categorical features with many categories, it could be more efficient to store Split.categories as a Set, not a List.  (It is currently a List.)  A Set might be more scalable (for log n lookups), though tests would need to be done to ensure that Sets do not incur too much more overhead than Lists.



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