<p>In <a href="https://github.com/mlpack/mlpack/pull/696#discussion_r67209396">src/mlpack/methods/edge_boxes/feature_extraction_impl.hpp</a>:</p>
<pre style='color:#555'>> + const size_t csize = OutImage.n_cols / shrink;
> +
> + /* this part gives double free or corruption out error
> + when executed for a second time */
> + CubeType reg_ch = CubeType(rsize, csize, num_channels);
> + CubeType ss_ch = CubeType(rsize, csize, num_channels);
> + this->GetShrunkChannels(InImage, reg_ch, ss_ch);
> +
> + loc /= shrink;
> +
> + CubeType reg_ftr = this->GetRegFtr(reg_ch, loc);
> + CubeType ss_ftr = this->GetSSFtr(ss_ch, loc);
> + arma::field<CubeType> F(2,1);
> + F(0,0) = reg_ftr;
> + F(1,0) = ss_ftr;
> + return F;
</pre>
<p>I think we could just use a single matrix for each feature matrix instead of a field. What do you think?</p>
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