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Commit d1cf3201 authored by Sean Owen's avatar Sean Owen Committed by Nick Pentreath
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[SPARK-14886][MLLIB] RankingMetrics.ndcgAt throw java.lang.ArrayIndexOutOfBoundsException 

## What changes were proposed in this pull request?

Handle case where number of predictions is less than label set, k in nDCG computation

## How was this patch tested?

New unit test; existing tests

Author: Sean Owen <sowen@cloudera.com>

Closes #12756 from srowen/SPARK-14886.
parent 24d07e45
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