def _last_index(self, s):
        self.set_index(max(0, self._find_one_after_last_labeled_index() - 1))
def __extract_clusters(self):
        self.__clusters = [[] for _ in range(self.__amount_clusters)]
        for index_point in range(len(self.__data)):
            candidates = []
            for index_cluster in range(self.__amount_clusters):
                candidates.append((index_cluster, self.__rc[index_cluster][index_point]))