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

[stereomatchingkiss]

I upload the test file, the name is "sparse_autoencoder_test_3.cpp". 
If you think it is ok, you could rename it to "sparse_autoencoder_test".

The api of the FFN are different than the original sparseAutoencoder, therefore
we need to do some change on the original codes.

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Reply to this email directly or view it on GitHub:
https://github.com/mlpack/mlpack/pull/451#issuecomment-174339537
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