<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'>&gt; +void Pad(const arma::Mat&lt;eT&gt;&amp; input, size_t wPad, size_t hPad, arma::Mat&lt;eT&gt;&amp; output)
&gt; +{
&gt; +  if (output.n_rows != input.n_rows + wPad * 2 ||
&gt; +      output.n_cols != input.n_cols + hPad * 2)
&gt; +    output = arma::zeros(input.n_rows + wPad * 2, input.n_cols + hPad * 2);  
&gt; +  output.submat(wPad, hPad, 
&gt; +        wPad + input.n_rows - 1,
&gt; +        hPad + input.n_cols - 1) = input;
&gt; +}
&gt; +
&gt; +template&lt;typename eT&gt;
&gt; +void Pad(const arma::Cube&lt;eT&gt;&amp; input, size_t wPad, size_t hPad, arma::Cube&lt;eT&gt;&amp; output)
&gt; +{
&gt; +  output = arma::zeros(input.n_rows + wPad * 2, input.n_cols + hPad * 2, input.n_slices);
&gt; +  for (size_t i = 0; i &lt; input.n_slices; ++i)
&gt; +    Pad&lt;double&gt;(input.slice(i), wPad, hPad, output.slice(i));
</pre>
<p>Why Pad but not Pad?</p>

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