Github user hhbyyh commented on the pull request:

    https://github.com/apache/spark/pull/4974#issuecomment-78412319
  
    Hi @srowen Thanks for the suggestions.
    
    1. For adding the `@return` prefix. Sounds fair, and if we're doing it, 
shall we change other implementations as well? (like LDA, GaussianMixture and 
others).
    
    2. For using foo rather than getFoo, again it may impact a wide range of 
code. And shall we change setters to `age_= (value:Int) : this.type` ? @srowen, 
@mengxr ,@jkbradley. I'm not sure what's the general recommendation within 
Spark. And I'd appreciate if there can be a quick decision from community 
leads. Thanks.


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