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https://issues.apache.org/jira/browse/SPARK-3164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14616246#comment-14616246
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Rekha Joshi commented on SPARK-3164:
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it was not assigned, nor closed/commented, and improvement suggestion needed in
latest snapshot.but ack on decision made on api stability. thanks for letting
me know [~josephkb]
- - sad, as i updated 5 files for a trivial pursuit, with the scala style
checks :-) :-)
> Store DecisionTree Split.categories as Set
> ------------------------------------------
>
> Key: SPARK-3164
> URL: https://issues.apache.org/jira/browse/SPARK-3164
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Reporter: Joseph K. Bradley
> Assignee: Joseph K. Bradley
> Priority: Trivial
> Fix For: 1.4.0
>
>
> 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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