<p>In <a href="https://github.com/mlpack/mlpack/pull/491#discussion_r47458539">src/mlpack/methods/ann/layer/dropout_layer.hpp</a>:</p>
<pre style='color:#555'>&gt; @@ -231,7 +250,7 @@ template &lt;
&gt;  &gt;
&gt;  using DropoutLayer2D = DropoutLayer&lt;InputDataType, OutputDataType&gt;;
&gt;  
&gt; -} // namespace ann
&gt; -} // namespace mlpack
&gt; +}; // namespace ann
&gt; +}; // namespace mlpack
</pre>
<p>This is pedantic (literally), but if you compile with <code>-pedantic</code> the extra semicolon produces a warning.  So I've been trying to avoid doing that. :)</p>

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