[mlpack-git] [mlpack] improve speed of SparseAutoencoder and make it more flexible (#451)

[stereomatchingkiss]

Thanks for the fix.

I would provide a command line programs, with different activations(relu, tanh, sigmoid) and dropout(if it works) after serialization of FFN done. 

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https://github.com/mlpack/mlpack/pull/451#issuecomment-177752759
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