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

[Tham]

> +
> +  //! Get the mapper
> +  const MapperType& Mapper() const { return mapper; }
> +
> +  //! Modify the given mapper (be careful!)
> +  MapperType& Mapper() { return mapper; }
> +
> + private:
> +  // StrategyType
> +  StrategyType strategy;
> +
> +  // DatasetMapperType<MapPolicy>
> +  MapperType mapper;
> +
> +  // save transpose as a member variable since it is rarely changed.
> +  bool transpose;

It used like this

"3.0 0.0 2.0 0.0;"
"5.0 6.0 0.0 6.0;"
"9.0 8.0 4.0 8.0;"

```
imputer.Impute(input, outputT, 0/*mappedValue*/, 
99/*customValue*/, 0/*dimension*/, true);
```

"3.0 99  2.0 99;"
"5.0 6.0 0.0 6.0;"
"9.0 8.0 4.0 8.0;"

```
imputer.Impute(input, outputT, 0/*mappedValue*/, 
99/*customValue*/, 1/*dimension*/, false);
```

"3.0 99  2.0 0.0;"
"5.0 6.0 0.0 6.0;"
"9.0 8.0 4.0 8.0;"

I guess the problem is the name , I should suggest keon name it as "rowOrColBase", or design an enum class for it.My fault

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