[mlpack-git] [mlpack/mlpack] DatasetMapper & Imputer (#694)

[Tham]

> +      for (size_t i = 0; i < input.n_cols; ++i)
> +      {
> +        if (input(dimension, i) == mappedValue)
> +        {
> +          targets.push_back(std::make_pair(dimension, i));
> +        }
> +        else
> +        {
> +          elems++;
> +          sum += input(i, dimension);
> +        }
> +      }
> +    }
> +
> +    // calculate mean;
> +    double mean = sum / elems;

What if elems == 0?

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