<p>In <a href="https://github.com/mlpack/mlpack/pull/694#discussion_r69908569">src/mlpack/core/data/map_policies/missing_policy.hpp</a>:</p>
<pre style='color:#555'>&gt; +/**
&gt; + * Same as increment map policy, but does not change type of features.
&gt; + */
&gt; +class MissingPolicy
&gt; +{
&gt; + public:
&gt; +  // typedef of mapped_type
&gt; +  using mapped_type = double;
&gt; +
&gt; +  MissingPolicy()
&gt; +  {
&gt; +    // Nothing to initialize here.
&gt; +  }
&gt; +
&gt; +  explicit MissingPolicy(std::set&lt;std::string&gt; missingSet) :
&gt; +    missingSet(std::move(missingSet))
</pre>
<p>This is picky, but this line should be indented two tabs instead of just one.</p>

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