<p>In <a href="https://github.com/mlpack/mlpack/pull/757#discussion_r74194353">src/mlpack/methods/ann/network_util_impl.hpp</a>:</p>
<pre style='color:#555'>> +void Pad(const arma::Mat<eT>& input, size_t wPad, size_t hPad, arma::Mat<eT>& output)
> +{
> + if (output.n_rows != input.n_rows + wPad * 2 ||
> + output.n_cols != input.n_cols + hPad * 2)
> + output = arma::zeros(input.n_rows + wPad * 2, input.n_cols + hPad * 2);
> + output.submat(wPad, hPad,
> + wPad + input.n_rows - 1,
> + hPad + input.n_cols - 1) = input;
> +}
> +
> +template<typename eT>
> +void Pad(const arma::Cube<eT>& input, size_t wPad, size_t hPad, arma::Cube<eT>& output)
> +{
> + output = arma::zeros(input.n_rows + wPad * 2, input.n_cols + hPad * 2, input.n_slices);
> + for (size_t i = 0; i < input.n_slices; ++i)
> + Pad<double>(input.slice(i), wPad, hPad, output.slice(i));
</pre>
<p>Why Pad but not Pad?</p>
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