Github user sethah commented on the issue:

    https://github.com/apache/spark/pull/19876
  
    @holdenk Do you mind leaving some comments on the intentions/benefits of 
this new API for the benefit of other reviewers? For example, what use cases 
may exist - adding third party PFA support (other third party export tools?), 
and also why we need to add PMML support when there are already tools that do 
this [jpmml-sparkml](https://github.com/jpmml/jpmml-sparkml). 
    
    Also, this is two changes in one PR: adding an API for generic model export 
and adding PMML to LinearRegression. I think it makes sense to separate the 
two, and just focus on the new API here. What do you think?


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