<p>In <a href="https://github.com/mlpack/mlpack/pull/691#discussion_r68644784">src/mlpack/methods/lsh/lsh_search_impl.hpp</a>:</p>
<pre style='color:#555'>&gt; +  actions.rows(numProj, (2 * numProj) - 1) = // last numProj rows
&gt; +    arma::ones&lt; arma::Col&lt;short int&gt; &gt; (numProj); // 1s
&gt; +
&gt; +
&gt; +  // Acting dimension vector shows which coordinate to transform according to
&gt; +  // actions described by actions vector
&gt; +  arma::Col&lt;size_t&gt; positions(2 * numProj); // will be [0 1 2 ... 0 1 2 ...]
&gt; +  positions.rows(0, numProj - 1) =
&gt; +    arma::linspace&lt; arma::Col&lt;size_t&gt; &gt;(0, numProj - 1, numProj);
&gt; +  positions.rows(numProj, 2 * numProj - 1) =
&gt; +    arma::linspace&lt; arma::Col&lt;size_t&gt; &gt;(0, numProj - 1, numProj);
&gt; +
&gt; +  // Special case: No need to create heap for 1 or 2 codes.
&gt; +  if (T &lt;= 2)
&gt; +  {
&gt; +
</pre>
<p>Extra line</p>

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