<p>In <a href="https://github.com/mlpack/mlpack/pull/691#discussion_r68644293">src/mlpack/methods/lsh/lsh_search_impl.hpp</a>:</p>
<pre style='color:#555'>> + return false; // invalid
> +}
> +
> +// Inline function used by GetAdditionalProbingBins. The vector expansion
> +// operation adds the element [1 + (largest_element)] to a vector A, where
> +// largest_element is the largest element of A. Returns true if resulting vector
> +// is valid, otherwise false.
> +inline bool perturbationExpand(std::vector<bool>& A)
> +{
> + // Find the last '1' in A
> + size_t maxPos = 0;
> + for (size_t i = 0; i < A.size(); ++i)
> + if (A[i]) // marked true
> + maxPos = i;
> +
> + if ( maxPos + 1 < A.size()) // otherwise, this is an invalid vector
</pre>
<p><code>if (maxPos + 1 < A.size())</code></p>
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