功能，请此处。返回值的确是发现的簇数。 I GUESS，然后找到哪个簇属于const Mat& C的每个特征向量。特征参数使用Mat&

There is a documentation for this function, here. The return value is indeed the number of clusters found. I GUESS that you then find to which cluster belong each feature vector in the const Mat& features parameter using Mat& centers.