shishaochen opened a new pull request #24470: [SPARK-27577][MLlib] Correct thresholds downsampled in BinaryClassificationMetrics URL: https://github.com/apache/spark/pull/24470 ## What changes were proposed in this pull request? Choose the last record in chunks when calculating metrics with downsampling in BinaryClassificationMetrics. ## How was this patch tested? A new unit test is added to verify thresholds from downsampled records.
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