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Posted to issues@spark.apache.org by "Joseph K. Bradley (JIRA)" <ji...@apache.org> on 2014/08/21 00:25:31 UTC

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

Joseph K. Bradley created SPARK-3164:
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             Summary: 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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