[GitHub] madlib issue #257: mini-batch user docs

[fmcquillan99]

Github user fmcquillan99 commented on the issue:

    https://github.com/apache/madlib/pull/257
  
    Main changes:
    
    4. Clarified grouping as per 
    https://github.com/apache/madlib/pull/263
    
    This is final change so you can review and merge if it looks good.


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