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

[stereomatchingkiss]

The function already finished, if you need it and decided where should I placed it, please give me a reply.

Example : 

//.....after training
arma::Mat encoderMatrix = parameters.submat(0, 0, hiddenSize - 1, VisibleSize - 1);
exportFiltersToPGMGrid("encoder_result.pgm", encoderMatrix.t(), 28, 28);

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Reply to this email directly or view it on GitHub:
https://github.com/mlpack/mlpack/issues/452#issuecomment-142807545
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