Camspiers\StatisticalClassifier\Transform\TokenCountByDocument::__invoke PHP Method

    public function __invoke($data)
    {
        $transform = array();
        foreach ($data as $category => $documents) {
            $transform[$category] = array();
            foreach ($documents as $tokens) {
                $transform[$category][] = array_count_values($tokens);
            }
        }
        return $transform;
    }