<p>In <a href="https://github.com/mlpack/mlpack/pull/703#discussion_r74704175">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; + 
&gt; +  CubeType channels(rsize, csize, numChannels);
&gt; +
&gt; +  size_t slice_idx;
&gt; +  for( slice_idx = 0; slice_idx &lt; luv.n_slices; ++slice_idx)
&gt; +    this-&gt;BilinearInterpolation(luv.slice(slice_idx), rsize, csize,
&gt; +                                channels.slice(slice_idx));
&gt; +  double scale = 1.0;
&gt; +  
&gt; +  while(scale &gt;= 0.5)
&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)
</pre>
<p>This overwrites the <code>slice_idx</code> parameter, we use below.</p>

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