<p>In <a href="https://github.com/mlpack/mlpack/pull/684#discussion_r66843588">src/mlpack/methods/neighbor_search/sort_policies/nearest_neighbor_sort.hpp</a>:</p>
<pre style='color:#555'>> @@ -150,6 +150,21 @@ class NearestNeighborSort
> return DBL_MAX;
> return a + b;
> }
> +
> + /**
> + * Return the given value relaxed.
> + *
> + * @param value Value to relax.
> + * @param epsilon Relative error (non-negative).
> + *
> + * @return double Value relaxed.
> + */
> + static inline double Relax(const double value, const double epsilon)
> + {
> + if (value == DBL_MAX)
> + return DBL_MAX;
> + return (1 / (1 + epsilon)) * value;
</pre>
<p>I like option 4 the most. It is up to you completely (I have no opinion here) but another possibility would be to provide <code>--epsilon</code> for <code>mlpack_kfn</code> as well as a <code>-p</code> option that you specified, so the user could provide either. But the disadvantage is that now there are two options instead of one. :)</p>
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