Github user MechCoder commented on the pull request:
https://github.com/apache/spark/pull/7538#issuecomment-127062094
Actually I'm not able to find a single test that checks for multiclass
input. It says `generateMultinomialLogisticInput` here
(https://github.com/apache/spark/blob/master/mllib/src/test/scala/org/apache/spark/ml/classification/LogisticRegressionSuite.scala#L59)
but it seems that it is actually a binary dataset.
Also
https://github.com/apache/spark/blob/master/mllib/src/main/scala/org/apache/spark/ml/classification/LogisticRegression.scala#L287
here numClasses is set explicitly to 2.
Surely I'm missing something?
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