<p>In <a href="https://github.com/mlpack/mlpack/pull/703#discussion_r68445013">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +
&gt; +}
&gt; +
&gt; +/**
&gt; + * Applies a triangle filter on an Image.
&gt; + * @param InImage Input/Output Image on which filter is applied.
&gt; + * @param radius Decides the size of kernel to be applied on Image.
&gt; + */
&gt; +template&lt;typename MatType, typename CubeType&gt;
&gt; +void StructuredForests&lt;MatType, CubeType&gt;::
&gt; +ConvTriangle(CubeType &amp;InImage, const size_t radius)
&gt; +{
&gt; +  if (radius == 0)
&gt; +  {
&gt; +    //nothing to do
&gt; +  }
</pre>
<p>A little bit weird to see empty if, since radius is size_t, you can</p>

<pre><code>if(radius != 0){
  if(radius == 1){
  //.....
  }else{
  //....
 }
}
</code></pre>

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