<p>In <a href="https://github.com/mlpack/mlpack/pull/696#discussion_r67194856">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +  size_t slice_idx = 0;
&gt; +  
&gt; +  for( slice_idx = 0; slice_idx &lt; luv.n_slices; ++slice_idx)
&gt; +    channels.slice(slice_idx)
&gt; +    = this-&gt;bilinearInterpolation(luv.slice(slice_idx), (size_t)rsize, (size_t)csize);
&gt; +
&gt; +  double scale = 0.5;
&gt; +  
&gt; +  while(scale &lt;= 1.0)
&gt; +  {
&gt; +    CubeType img( (luv.n_rows * scale),
&gt; +                   (luv.n_cols * scale),
&gt; +                   luv.n_slices );
&gt; +
&gt; +    for( slice_idx = 0; slice_idx &lt; luv.n_slices; ++slice_idx)
&gt; +    {
</pre>
<p>This overwrites the <code>slice_idx</code>parameter, we use below.</p>

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