<p>In <a href="https://github.com/mlpack/mlpack/pull/749#discussion_r74690019">src/mlpack/methods/lsh_model/lshmodel.hpp</a>:</p>
<pre style='color:#555'>&gt; +   * Inline function used by GetAdditionalProbingBins. The vector expansion
&gt; +   * operation adds the element [1 + (largest_element)] to a vector A, where
&gt; +   * largest_element is the largest element of A. Returns true if resulting vector
&gt; +   * is valid, otherwise false.
&gt; +   * @param A perturbation set to expand.
&gt; +  */
&gt; +  bool PerturbationExpand(std::vector&lt;bool&gt;&amp; A) const;
&gt; +
&gt; +  /**
&gt; +   * Return true if perturbation set A is valid. A perturbation set is invalid if
&gt; +   * it contains two (or more) actions for the same dimension or dimensions that
&gt; +   * are larger than the queryCode&#39;s dimensions.
&gt; +   * @param A perturbation set to validate.
&gt; +   * @param numProj The number of projections for the sequence under validation.
&gt; +  */
&gt; +  bool PerturbationValid(const std::vector&lt;bool&gt;&amp; A, size_t numProj) const;
</pre>
<p>I believe these Perturbation* functions are exactly the same as in <code>LSHSearch</code>, so maybe we should mark those methods static and use them here, or create some auxiliary class for multi-probe LSH searches and use that.</p>

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