Github user dbtsai commented on a diff in the pull request:

    https://github.com/apache/spark/pull/10384#discussion_r48390247
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/mllib/evaluation/RegressionMetrics.scala 
---
    @@ -23,15 +23,23 @@ import org.apache.spark.Logging
     import org.apache.spark.mllib.linalg.Vectors
     import org.apache.spark.mllib.stat.{MultivariateStatisticalSummary, 
MultivariateOnlineSummarizer}
     import org.apache.spark.sql.DataFrame
    -
     /**
      * Evaluator for regression.
      *
    - * @param predictionAndObservations an RDD of (prediction, observation) 
pairs.
    + * @param predictionAndObservations an RDD of (prediction, observation) 
pairs,
    + * @param regThroughOrigin true if intercept is not included in linear 
regression model
    --- End diff --
    
    That makes sense. Could you change `regThroughOrigin` to `throughOrigin` 
since reg is often used as regularization. Also, could you update the scala doc 
saying that `True if the regression is through the origin. For example, in 
linear regression, it will be true without fitting intercept`.


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