Violin Plot AttributeError: 'list' object has no attribute 'shape'

[User559180]

Hi,
I used the following code to create a violin plot (I tried it in both Brightway2 and Brightway2.5 with the same result):

from polyviz import chord, violin
db_ecoinvent = bd.Database('ecoinvent-3.11-apos')
violin(
activities=[a for a in db_ecoinvent if a["unit"] == "ton kilometer"][:3],
method=('EF v3.1', 'climate change', 'global warming potential (GWP100)'),
iterations=100,
title = "violin test 1"
)

However, I encountered this AttributeError:

Could you please help me figure out what might be causing this issue? Did I do something wrong, or is there an error in your code?
Thank you in advance!

[romainsacchi]

I do not have a direct idea.
Did you check that the GWP LCIA method you use is indeed present in bw2data.methods ?

try:

('EF v3.1', 'climate change', 'global warming potential (GWP100)') in bw2data.methods

[User559180]

Thank you very much for your quick response!

Yes, the EF v3.1 climate change LCIA method is indeed present in Brightway methods. I successfully created a chord diagram using this method, and here is the code I used:

chord(
activity=my_activity,
level=4,
cutoff=0.01,
#flow_type="kilogram",
method=('EF v3.1', 'climate change', 'global warming potential (GWP100)'),
notebook = True,
figsize = (720, 720)
)

I am not an expert, but I tested your violin.py code and noticed something that might be causing the issue. In the section with the if MultipleMonteCarlo ... else ... logic: If the if condition is True, the line res = MultiMonteCarlo() generates a python list.
In the else block, res is assigned as an np.array. However, in the if block, res remains a list and still needs to be converted into an np.array.

Could you please look into this and fix the problem? I would be very grateful for your help.