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

[Ryan Curtin]

> +#include <mlpack/core.hpp>
> +#include <mlpack/core/data/imputer.hpp>
> +#include <mlpack/core/data/dataset_info.hpp>
> +#include <mlpack/core/data/map_policies/increment_policy.hpp>
> +#include <mlpack/core/data/map_policies/missing_policy.hpp>
> +#include <mlpack/core/data/imputation_methods/mean_imputation.hpp>
> +#include <mlpack/core/data/imputation_methods/median_imputation.hpp>
> +#include <mlpack/core/data/imputation_methods/custom_imputation.hpp>
> +#include <mlpack/core/data/imputation_methods/listwise_deletion.hpp>
> +
> +PROGRAM_INFO("Impute Data", "This utility takes a dataset and converts user "
> +    "defined missing variable to another to provide more meaningful analysis "
> +    "\n\n"
> +    "The program does not modify the original file, but instead makes a "
> +    "separate file to save the output data; The program requires you to "
> +    "specify the file name with --output_file (-o)."

It says here that --output_file is required, but in the code it isn't required and only a warning is issued if --output_file is not specified. I think issuing a warning is a better approach, so maybe we should update the documentation here?

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