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Posted to issues@spark.apache.org by "zhengruifeng (JIRA)" <ji...@apache.org> on 2019/05/20 09:34:00 UTC

[jira] [Created] (SPARK-27777) Eliminate uncessary sliding job in AreaUnderCurve

zhengruifeng created SPARK-27777:
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             Summary: Eliminate uncessary sliding job in AreaUnderCurve
                 Key: SPARK-27777
                 URL: https://issues.apache.org/jira/browse/SPARK-27777
             Project: Spark
          Issue Type: Improvement
          Components: ML
    Affects Versions: 3.0.0
            Reporter: zhengruifeng


Current impl of \{AreaUnderCurve} use \{SlidingRDD} to perform sliding, in which a prepending job is needed to compute the head items on each partition.

However, this job can be eliminated in computation of AUC by collecting local areas and head/last at once.



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