我想编写一个函数,将大型稀疏矩阵的各行标准化(使它们加起来等于一)。
from pylab import *
import scipy.sparse as sp
def normalize(W):
z = W.sum(0)
z[z < 1e-6] = 1e-6
return W / z[None,:]
w = (rand(10,10)<0.1)*rand(10,10)
w = sp.csr_matrix(w)
w = normalize(w)
然而,这会导致以下异常:
File "/usr/lib/python2.6/dist-packages/scipy/sparse/base.py", line 325, in __div__
return self.__truediv__(other)
File "/usr/lib/python2.6/dist-packages/scipy/sparse/compressed.py", line 230, in __truediv__
raise NotImplementedError
有没有比较简单的解决方案?我看过这个,但我仍然不清楚如何实际执行除法。