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

    public function __invoke($data)
    {
        $transform = array();
        foreach ($data as $category => $documents) {
            $transform[$category] = 0;
            foreach ($documents as $document) {
                $transform[$category] += count($document);
            }
        }
        return $transform;
    }