Github user mengxr commented on the pull request:

    https://github.com/apache/spark/pull/7517#issuecomment-123380348
  
    @jkbradley Isotonic regression expects a single feature instead of a 
feature vector. Do we want to make it a `Regressor` and use `featuresCol` as a 
param? One common use case of isotonic regression is to calibrate probabilities 
output by logistic regression. However, logistic regression only outputs 
probabilities as vectors (of size 2). It would be hard to connect logistic 
regression with isotonic regression. Any suggestions?


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