<p>In <a href="https://github.com/mlpack/mlpack/pull/716#discussion_r69671886">src/mlpack/methods/pca/pca_impl.hpp</a>:</p>
<pre style='color:#555'>&gt;  #include &lt;mlpack/core.hpp&gt;
&gt; +#include &quot;pca.hpp&quot;
&gt;  
&gt;  using namespace std;
</pre>
<p>Do you forgot to removed using namespace std from header file?</p>

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