<p>In <a href="https://github.com/mlpack/mlpack/pull/747#discussion_r75038128">src/mlpack/methods/neighbor_search/knn_main.cpp</a>:</p>
<pre style='color:#555'>> + double effectiveError = 0;
> + size_t cases = 0;
> + for (size_t i = 0; i < distances.n_elem; i++)
> + {
> + if (distancesExact(i) != 0 && distances(i) != DBL_MAX)
> + {
> + effectiveError += (distances(i) - distancesExact(i)) /
> + distancesExact(i);
> + cases++;
> + }
> + }
> + if (cases)
> + effectiveError /= cases;
> +
> + Log::Info << "Effective error: " << effectiveError << endl;
> + }
</pre>
<p><a href="https://github.com/rcurtin" class="user-mention">@rcurtin</a> , I have implemented this in <a href="https://github.com/mlpack/mlpack/pull/747/commits/92155154bc8721055702ae3d22c33542f2f07a61" class="commit-link"><tt>9215515</tt></a> and <a href="https://github.com/mlpack/mlpack/pull/747/commits/3e79d273545cb5d5694f6c8e7370a0dbbd95e5e6" class="commit-link"><tt>3e79d27</tt></a>.</p>
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