Error in example of sum product

[qillbel]

Dear Author,

I got this error after installing this package. Can you tell me what I need to do?

`TypeError Traceback (most recent call last)
in ()
39 # Perform sum-product algorithm on factor graph
40 # and request belief of variable node x4
---> 41 belief = inference.sum_product(fg, x4)
42
43 # Print belief of variables

~\Downloads\BitBucket\python\FGlib\fglib\inference.py in sum_product(graph, query_node)
61
62 # Sum-Product algorithm is equivalent to Belief Propagation
---> 63 return belief_propagation(graph, query_node)
64
65

~\Downloads\BitBucket\python\FGlib\fglib\inference.py in belief_propagation(graph, query_node)
49
50 # Return marginal distribution
---> 51 return query_node.belief()
52
53

~\Downloads\BitBucket\python\FGlib\fglib\nodes.py in belief(self, normalize)
132
133 # Pick first node
--> 134 n = next(iterator)
135
136 # Product over all incoming messages

TypeError: 'list' object is not an iterator`

[danbar]

I tried a fresh install with

$ pip install fglib

and got the following output

$ python3 example_spa
Belief of variable node x4:
[0.49090909 0.50909091]
Belief of variable node x3:
[0.49090909 0.50909091]
Belief of variable node x2:
[0.89090909 0.10909091]
Unnormalized belief of variable node x1:
[0.183 0.147]

Could you provide the output of $ python --version and $ pip list?