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

[stereomatchingkiss]

>I guess since the forward and backward functions provide the same output as the old code, the test should run without any problems. If that's the case I'll be happy to merge the changes.

If you think so, then I would write a simple test case to test the output of forward and backward later on. After this has been done, we could deal with another problem

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