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

    https://github.com/apache/spark/pull/19072#discussion_r135951191
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/ml/classification/LogisticRegression.scala
 ---
    @@ -1471,6 +1471,14 @@ sealed trait LogisticRegressionSummary extends 
Serializable {
       /** Returns weighted averaged f1-measure. */
       @Since("2.3.0")
       def weightedFMeasure: Double = multiclassMetrics.weightedFMeasure(1.0)
    +
    +  /** Convenient method for casting to binary logistic regression summary 
*/
    --- End diff --
    
    Please document that this throws an Exception if the summary is not a 
binary summary.


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