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

    https://github.com/apache/spark/pull/21719#discussion_r200498732
  
    --- Diff: 
mllib/src/main/scala/org/apache/spark/ml/util/Instrumentation.scala ---
    @@ -148,12 +170,25 @@ private[spark] class Instrumentation[E <: 
Estimator[_]] private (
       }
     
     
    +  // TODO: Remove this (possibly replace with logModel?)
       /**
        * Logs the successful completion of the training session.
        */
       def logSuccess(model: Model[_]): Unit = {
         log(s"training finished")
       }
    +
    +  def logSuccess(): Unit = {
    +    log("training finished")
    --- End diff --
    
    We shouldn't have this `log` alias. I was wondering which log level it 
uses. Just use `logInfo` and remove `log(`.


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