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;
}