<p>(My comments here are only specific to the <code>SparseAutoencoder</code> code Siddharth wrote, in <code>src/mlpack/methods/sparse_autoencoder</code>; I don't know if zoq thinks this could be useful for the larger ANN code, which I think eventually <code>SparseAutoencoder</code> should be refactored to fit inside of.  For now we can just work with <code>SparseAutoencoder</code>, and figure out a potential merge later down the road, if that ends up working.)</p>

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