There's a ValueError on EM_demo.py

[tiddlerhxy]

hello!
When I ran EM_demo.py, an error occurred,can you tell me what happened?
The following is the wrong report:
Traceback (most recent call last):
File "/root/root/eyes/appone/tt6.py", line 55, in
fitmodel.EM_fit()
File "/usr/local/python3.6.6/lib/python3.6/site-packages/pybasicbayes/abstractions.py", line 221, in EM_fit
return self._EM_fit(self.EM_step,tol=tol,maxiter=maxiter)
File "/usr/local/python3.6.6/lib/python3.6/site-packages/pybasicbayes/abstractions.py", line 206, in _EM_fit
method()
File "/usr/local/python3.6.6/lib/python3.6/site-packages/pybasicbayes/models/mixture.py", line 481, in EM_step
[l.expectations for l in self.labels_list])
File "/usr/local/python3.6.6/lib/python3.6/site-packages/pybasicbayes/distributions/multinomial.py", line 190, in max_likelihood
counts = self._get_weighted_statistics(data,weights)
File "/usr/local/python3.6.6/lib/python3.6/site-packages/pybasicbayes/distributions/multinomial.py", line 140, in _get_weighted_statistics
data = data if data else [None]*len(weights)
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()