Github user jkbradley commented on a diff in the pull request: https://github.com/apache/spark/pull/21078#discussion_r182836091 --- Diff: mllib/src/main/scala/org/apache/spark/ml/regression/LinearRegression.scala --- @@ -378,18 +378,24 @@ class LinearRegression @Since("1.3.0") (@Since("1.3.0") override val uid: String val yMean = ySummarizer.mean(0) val rawYStd = math.sqrt(ySummarizer.variance(0)) + + instr.logNamedValue(Instrumentation.loggerTags.numExamples, ySummarizer.count) --- End diff -- It might be worth creating a logNumExamples() method in Instrumentation since I bet we'll add this elsewhere.
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