[mlpack-git] [mlpack/mlpack] Spill trees (#747)

[MarcosPividori]

> +      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;
> +    }

@rcurtin , I have implemented this in https://github.com/mlpack/mlpack/pull/747/commits/92155154bc8721055702ae3d22c33542f2f07a61 and https://github.com/mlpack/mlpack/pull/747/commits/3e79d273545cb5d5694f6c8e7370a0dbbd95e5e6.

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