<p>In <a href="https://github.com/mlpack/mlpack/pull/746#discussion_r75777495">src/mlpack/core/tree/cellbound_impl.hpp</a>:</p>
<pre style='color:#555'>> +void CellBound<MetricType, ElemType>::AddBound(
> + const arma::Col<ElemType>& loCorner,
> + const arma::Col<ElemType>& hiCorner)
> +{
> + assert(numBounds < loBound.n_cols);
> + assert(loBound.n_rows == dim);
> + assert(loCorner.n_elem == dim);
> + assert(hiCorner.n_elem == dim);
> +
> + // If the subrectangle is not contained entirely in the outer rectangle,
> + // we shrink it.
> + for (size_t k = 0; k < dim; k++)
> + {
> + loBound(k, numBounds) = std::max(loCorner[k], bounds[k].Lo());
> +
> + hiBound(k, numBounds) = std::min(bounds[k].Hi(), hiCorner[k]);
</pre>
<p>I think I understand. Some of the hyperrectangles may be even empty.</p>
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