CacheCheck created SPARK-31218:
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             Summary: counts in BinaryClassificationMetrics should be cached
                 Key: SPARK-31218
                 URL: https://issues.apache.org/jira/browse/SPARK-31218
             Project: Spark
          Issue Type: Improvement
          Components: ML, MLlib
    Affects Versions: 2.4.5, 2.4.4
            Reporter: CacheCheck


In mllib.evaluation.BinaryClassifcationMetrics.recallByThreshold(), rdd 
_counts_ should be cached for the following multiple actions will use it.



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