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

Tham notifications at github.com
Fri Jun 24 02:15:31 EDT 2016


> +    double sum;
> +    size_t elems = 0; // excluding nan or missing target
> +
> +    using PairType = std::pair<size_t, size_t>;
> +    // dimensions and indexes are saved as pairs inside this vector.
> +    std::vector<PairType> targets;
> +
> +    // calculate number of elements and sum of them excluding mapped value or
> +    // nan. while doing that, remember where mappedValue or NaN exists.
> +    if (transpose)
> +    {
> +      for (size_t i = 0; i < input.n_rows; ++i)
> +      {
> +        if (input(i, dimension) == mappedValue)
> +        {
> +          targets.push_back(std::make_pair(i, dimension));

Another approach(maybe you already know)--targets.emplace_back(i, dimension);

Different with push_back is emplace_back will construct the value directly,it may(or may not) provide better performance. Pick the one you like :)

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