Github user mengxr commented on the issue:

    https://github.com/apache/spark/pull/16222
  
    @wangmiao1981 Sorry, I was actually suggesting removing the math part. 
Those are standard logistic regression formulations, which could be found in 
many other places. We don't really need to repeat them here. Just providing 
some pointers should be sufficient.
    
    The second half overlaps with the API doc. It would cause maintenance 
overhead, e.g. how to keep the content in sync. Take dplyr for example, the 
[reference manual](https://cran.rstudio.com/web/packages/dplyr/dplyr.pdf) 
contains the API doc while [the 
vignettes](https://cran.rstudio.com/web/packages/dplyr/vignettes/) are more 
tutorial-like. We should move towards this direction and having less duplicate 
content in our code base. For this one in particular, I suggest doing a quick 
introduction followed by some example code.


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