public static function recall(int $tp, int $fn) : float
    {
        return $tp / (($tp + $fn) ?: EPSILON);
    }
public static function recall(int $tp, int $fn) : float
    {
        return $tp / (($tp + $fn) ?: EPSILON);
    }
public static function recall ( int $ tp , int $ fn ) : float { return $ tp / ( ( $ tp + $ fn ) ? : EPSILON ) ; }
Compute the class recall.

@param int $tp
@param int $fn
@return float
Compute the class recall .