[mlpack-git] [mlpack/mlpack] GammaDistribution: Adds functionality to solve #749 (#751)
Ryan Curtin
notifications at github.com
Fri Aug 5 23:33:39 EDT 2016
> + // Compute denominator only once for each dimension.
> + arma::vec denominators(alpha.n_elem);
> + for (size_t d = 0; d < alpha.n_elem; ++d)
> + denominators(d) = std::tgamma(alpha(d)) * std::pow(beta(d), alpha(d));
> +
> + // Compute probability of each observation.
> + for (size_t i = 0; i < numObs; ++i)
> + {
> + for (size_t d = 0; d < observations.n_rows; ++d)
> + {
> + // Compute probability using Multiplication Law and Logarithm addition
> + // property.
> + LogProbabilities(i) += std::log(
> + std::pow(observations(d, i), alpha(d) - 1)
> + * std::exp(-observations(d, i) / beta(d))
> + / denominators(d));
Same comment about indentation and readability applies here.
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