<p>In <a href="https://github.com/mlpack/mlpack/pull/680#discussion_r67158056">.gitignore</a>:</p>
<pre style='color:#555'>&gt; @@ -6,3 +6,6 @@ build*
&gt;  *.bak
&gt;  src/mlpack/core/util/gitversion.hpp
&gt;  src/mlpack/core/util/arma_config.hpp
&gt; +
&gt; +.idea
</pre>
<p>I would say so, yes. What program generates a .idea file?</p>

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