Frank McQuillan closed MADLIB-1227.

> In MLP classification with mini-batch, check for 1-hot encoding of dependent 
> variable
> -------------------------------------------------------------------------------------
>                 Key: MADLIB-1227
>                 URL: https://issues.apache.org/jira/browse/MADLIB-1227
>             Project: Apache MADlib
>          Issue Type: Improvement
>            Reporter: Frank McQuillan
>            Priority: Minor
>             Fix For: v1.14
> Related to
> https://issues.apache.org/jira/browse/MADLIB-1226
> Add check to MLP classification code to check that the dependent var has been 
> 1-hot encoded by accident, and error out if that is not the case.  
> This is to avoid the case of passing INTs as dep var to MLP that have not 
> been 1-hot encoded and having it run classification and not converge, or give 
> erroneous results, and giving no notification to the user about the problem.
> OK to pick 1st row and check one that y array value for encoding looks like:
> {code}
> [0.0, 1.0, 0.0 ...]
> {code}
> i.e., all 0's and just one 1

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