Github user BryanCutler commented on the issue:
https://github.com/apache/spark/pull/13481
Thanks @MLnick , I made those changes. The string representation for the
RFormulaModel is really ugly - it has lots of `WrappedArray` types. I took all
that out of the doc test, so let me know if what is there is ok. I'm not
really sure how it is even useful, maybe for debugging I guess?
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