<p>In <a href="https://github.com/mlpack/mlpack/pull/683#discussion_r66475537">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +  }
&gt; +
&gt; +  return InImage;
&gt; +}
&gt; +
&gt; +template&lt;typename MatType, typename CubeType&gt;
&gt; +CubeType StructuredForests&lt;MatType, CubeType&gt;::
&gt; +ConvTriangle(CubeType&amp; InImage, int radius)
&gt; +{
&gt; +  if (radius == 0)
&gt; +  {
&gt; +    return InImage;
&gt; +  }
&gt; +  else if (radius &lt;= 1)
&gt; +  {
&gt; +    double p = 12.0 / radius / (radius + 2) - 2;
</pre>
<p><code>const double p = ...</code></p>

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