Hello MADlib folks,

I was testing MNIST dataset with minibatch preprocessor + MLP on master,
and could not get it to converge.   It turned out to be user error (me) and
not a problem with convergence at all, because I forgot to 1-hot encode the
dependent variable.

But I am wondering if other people might do the same thing that I did and
get confused, so I created 2 JIRAs that I hope will help out:


I'd suggest we do this for the upcoming release 1.14.

Please let me know if you don't think this is the right approach.


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