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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