<p>In <a href="https://github.com/mlpack/mlpack/pull/716#discussion_r69716514">src/mlpack/methods/pca/pca_impl.hpp</a>:</p>
<pre style='color:#555'>> #include <mlpack/core.hpp>
> +#include "pca.hpp"
>
> using namespace std;
</pre>
<p>It's used for:</p>
<p><code><br>
Log::Fatal << "PCA::Apply(): varRetained (" << varRetained << ") must be "<br>
<< "greater than or equal to 0." << endl;<br>
</code></p>
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