[mlpack-git] [mlpack] [Proposal]Add a function to visualize the results of sparse_autoencoder (#452)

[stereomatchingkiss]

>Then, if it was an image, you could call maximalInput.reshape() to set the size of the input correctly, >then you could do bilinear interpolation and/or write it to a file and postprocess from there.

Looks nice for me:). But I have a question

    sa.MaximalInput(0 /* for hidden unit 0 */, maximalInput);

why not just pass in the maximalInput?

    sa.MaximalInput(maximalInput);
    maximalInput.save(fileName, arma::pgm_binary);



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https://github.com/mlpack/mlpack/issues/452#issuecomment-150379147
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