Length n of condensed distance matrix ‘y‘ must be a binomial coefficient

在利用层次聚类算法的时候，报错：

ValueError: Length n of condensed distance matrix 'y' must be a binomial coefficient, i.e.there must be a k such that (k \choose 2)=n)!

import scipy.cluster.hierarchy as hcluster

df = df.iloc[:2000, :].apply(lambda x: sum(x), axis=1)
linkage = hcluster.linkage(df, method='centroid')

注：我的df是一个Series，而不是dataframe，改成Dataframe格式即可

linkage = hcluster.linkage(pd.DataFrame(df), method='centroid')

参考资料
[1] scipy.cluster.hierarchy.linkage 2020.5