Python快速集群模块中的距离度量

Question

我想使用fastcluster模块进行分层聚类。当我的默认（欧几里德）距离度量，它工作正常：

import fastcluster
import scipy.cluster.hierarchy
distance = spatial.distance.pdist(data)
linkage = fastcluster.linkage(distance,method="complete")

但问题是当我想使用“余弦相似度”作为距离度量时：

distance = spatial.distance.pdist(data,'cosine')
linkage = fastcluster.linkage(distance,method="complete")

输出结果为：

Traceback (most recent call last):
  File "C:\djcode\mysite\mysite\scipytest.py", line 52, in <module>
    linkage = fastcluster.linkage(distance,method="complete")
  File "C:\Python33\lib\site-packages\fastcluster.py", line 245, in linkage
    linkage_wrap(N, X, Z, mthidx[method])
FloatingPointError: NaN dissimilarity value.