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

[stereomatchingkiss]

Using FNN to implement autoencoder/sparse autoencoder remind me that most(or all) of the ann module do not support serialize yet, should I open another pull request to discuss the implementation details of serialization?

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Reply to this email directly or view it on GitHub:
https://github.com/mlpack/mlpack/pull/451#issuecomment-161926381
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