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

[Tham]

> +  // MissingPolicy should convert strings to nans
> +  BOOST_REQUIRE(std::isnan(input(0, 0)) == true);
> +  BOOST_REQUIRE_CLOSE(input(0, 1), 5.0, 1e-5);
> +  BOOST_REQUIRE_CLOSE(input(0, 2), 8.0, 1e-5);
> +  BOOST_REQUIRE_CLOSE(input(1, 0), 2.0, 1e-5);
> +  BOOST_REQUIRE_CLOSE(input(1, 1), 6.0, 1e-5);
> +  BOOST_REQUIRE_CLOSE(input(1, 2), 9.0, 1e-5);
> +  BOOST_REQUIRE_CLOSE(input(2, 0), 3.0, 1e-5);
> +  BOOST_REQUIRE(std::isnan(input(2, 1)) == true);
> +  BOOST_REQUIRE_CLOSE(input(2, 2), 10.0, 1e-5);
> +
> +  CustomImputation<double> customStrategy(99); // convert missing vals to 99.
> +  Imputer<double,
> +          DatasetMapper<MissingPolicy>,
> +          CustomImputation<double>> imputer(info, customStrategy);
> +  imputer.Impute(input, output, "a", 0); // convert a -> 99 for dimension 0

I think the comments should be

`// convert a or nan to 99 for dimension 0`

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