public static function softmax(array $𝐳) : array { $ℯ = \M_E; $∑ᴷℯᶻᵢ = array_sum(array_map(function ($z) use($ℯ) { return $ℯ ** $z; }, $𝐳)); $σ⟮𝐳⟯ⱼ = array_map(function ($z) use($ℯ, $∑ᴷℯᶻᵢ) { return $ℯ ** $z / $∑ᴷℯᶻᵢ; }, $𝐳); return $σ⟮𝐳⟯ⱼ; }