def save(self, doc):
        if doc.id:
            return self.update(doc)
        else:
            return self.insert(doc)
def __initialize_kmeans(self):
        initial_centers = kmeans_plusplus_initializer(self.__sample, self.__amount).initialize()
        kmeans_instance = kmeans(self.__sample, initial_centers, ccore = True)
        kmeans_instance.process()