<p>In <a href="https://github.com/mlpack/mlpack/pull/691#discussion_r68644393">src/mlpack/methods/lsh/lsh_search_impl.hpp</a>:</p>
<pre style='color:#555'>> + // Use check to mark dimensions we have seen before in A. If a dimension is
> + // seen twice (or more), A is not a valid perturbation.
> + std::vector<bool> check(numProj);
> +
> + if (A.size() > 2 * numProj)
> + return false; // This should never happen.
> +
> + // Check that we only see each dimension once. If not, vector is not valid.
> + for (size_t i = 0; i < A.size(); ++i)
> + {
> + // Only check dimensions that were included.
> + if (!A[i])
> + continue;
> +
> + // If dimesnion is unseen thus far, mark it as seen.
> + if ( check[i % numProj] == false )
</pre>
<p>Extra spaces on the inside of the parentheses; we should go with <code>if (check[i % numProj] == false)</code>.</p>
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