<p><b>@thejonan</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/mlpack/mlpack/pull/802">src/mlpack/methods/det/dt_utils_impl.hpp</a>:</p>
<pre style='color:#555'>&gt;        cvDTree.PruneAndUpdate(cvOldAlpha, train.n_cols, useVolumeReg);
     }
 
     // Compute test values for this state of the tree.
     double cvVal = 0.0;
     for (size_t i = 0; i &lt; test.n_cols; ++i)
     {
-      arma::vec testPoint = test.unsafe_col(i);
+      typename MatType::vec_type testPoint = test.unsafe_col(i);
       cvVal += cvDTree.ComputeValue(testPoint);
</pre>
<p>You're totally right about this, and it is changed in my side, but I didn't realize it is not just for <code>mlpack_det</code> tool that still doesn't support loading of sparse matrices at the first place. I'll fix it in this branch.</p>

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