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

[Tham]

> +          targets.push_back(std::make_pair(dimension, i));
> +        }
> +        else
> +        {
> +          elems++;
> +          sum += input(i, dimension);
> +        }
> +      }
> +    }
> +
> +    // calculate mean;
> +    double mean = sum / elems;
> +
> +    // Now replace the calculated mean to the missing variables
> +    // It only needs to loop through targets vector, not the whole matrix.
> +    for (const PairType& target : targets)

Neat idea :+1: 

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