<p><code>-arma::sp_mat</code> backported for Armadillo &lt;= 4.000 in <a href="https://github.com/mlpack/mlpack/commit/dd5d265ac1897b96cc7e98778557a1361415d509" class="commit-link"><tt>dd5d265</tt></a> (I suppose I'll find out tonight if I backported it correctly for all Armadillo versions...)</p>

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