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

[Tham]

> +  {
> +    // Nothing to initialize here.
> +  }
> +
> +
> +  template <typename MapType>
> +  mapped_type MapString(const std::string& string,
> +                        const size_t dimension,
> +                        MapType maps,
> +                        std::vector<Datatype>& types)
> +  {
> +    // If this condition is true, either we have no mapping for the given string
> +    // or we have no mappings for the given dimension at all.  In either case,
> +    // we create a mapping.
> +    const double NaN = std::numeric_limits<double>::quiet_NaN();
> +    if (missingSet.count(string) != 0 &&

The role of missingSet and maps are different. 
missingSet specify which value/string we should map to
maps record the value/string we already mapped to

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