[jira] [Created] (SPARK-3510) Create method for calculating error between expected result and actual

["Egor Pakhomov (JIRA)" <ji...@apache.org>]

Egor Pakhomov created SPARK-3510:
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             Summary: Create method for calculating error between expected result and actual
                 Key: SPARK-3510
                 URL: https://issues.apache.org/jira/browse/SPARK-3510
             Project: Spark
          Issue Type: New Feature
          Components: MLlib
            Reporter: Egor Pakhomov
            Priority: Minor


Could not do it right now, because zip operation need same number elements in partition, which I can not garantee.
right now using next code: 
{code:title=Bar.scala|borderStyle=solid}
    val expectedRepartitioned = expected.cache().repartition(1) // need for zip operation
    val actualRepartitioned = actual.cache().repartition(1)
    new DoubleRDDFunctions(
      expectedRepartitioned
        .zip(actualRepartitioned)
        .map(a => {
        Math.pow(a._1 - a._2, 2)
      })).mean()
{code}



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