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

[Tham]

> +#define MLPACK_CORE_DATA_MAP_POLICIES_MISSING_POLICY_HPP
> +
> +#include <mlpack/core.hpp>
> +#include <unordered_map>
> +#include <boost/bimap.hpp>
> +#include <mlpack/core/data/map_policies/datatype.hpp>
> +#include <limits>
> +
> +
> +using namespace std;
> +
> +namespace mlpack {
> +namespace data {
> +
> +/**
> + * Same as increment map policy, but does not change type of features.

MissingPolicy only map desired value/string to nan.

Example : 
MissingPolicy miss({"a"});
0 a 2 3 4 map to 0 nan 2 3 4

IncrementPocliy inc;
0 a 2 3 4 map to 0 1 2 3 4


The role of missingSet and maps are different. 

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