Issue with Unkown params from ecoinvent inventories

[RomainBes]

I was working on the update of some previously working parameterized lca model, but using the ecoinvent 3.10 database and a newer version of lca_algebraic, I have some issues.

When I select an ecoinvent activity, and copy it to later modify it, I cannot compute its impacts.

act = agb.findActivity(  'uranium production, centrifuge, enriched 3.8%'  ,
    db_name=eidb.name, loc=     'DE'
) 
act2 = agb.copyActivity(activity = act,
                    code = act['name'] + ' adjusted',
                    db_name = USER_DB)
agb.compute_impacts(act2, impacts)

---

Exception Traceback (most recent call last)
Cell In[68], line 1
----> 1 agb.compute_impacts(act2, impacts)

File ~/conda/envs/python311/lib/python3.11/site-packages/lca_algebraic/lca.py:626, in compute_impacts(models, methods, axis, functional_unit, return_params, description, **params)
623 if functional_unit != 1:
624 alpha = alpha / functional_unit
--> 626 lambdas = _preMultiLCAAlgebric(model, methods, alpha=alpha, axis=axis)
628 res = _postMultiLCAAlgebric(methods, lambdas, with_params=return_params, **params)
629 if return_params:

File ~/conda/envs/python311/lib/python3.11/site-packages/lca_algebraic/lca.py:368, in _preMultiLCAAlgebric(model, methods, alpha, axis)
365 exprs = _modelToExpr(model, methods, alpha=alpha, axis=axis)
367 # Lambdify (compile) expressions
--> 368 return [LambdaWithParamNames(expr) for expr in exprs]

File ~/conda/envs/python311/lib/python3.11/site-packages/lca_algebraic/lca.py:368, in (.0)
365 exprs = _modelToExpr(model, methods, alpha=alpha, axis=axis)
367 # Lambdify (compile) expressions
--> 368 return [LambdaWithParamNames(expr) for expr in exprs]

File ~/conda/envs/python311/lib/python3.11/site-packages/lca_algebraic/lca.py:296, in LambdaWithParamNames.init(self, exprOrDict, expanded_params, params, sobols)
294 if params is None:
295 expanded_params = _free_symbols(exprOrDict)
--> 296 params = _expanded_names_to_names(expanded_params)
297 self.params = params
299 # We expand again the parameters
300 # If we expect an enum param name, we also expect the other ones :
301 # enumparam_val1 => enumparam_val1, enumparam_val2, ...

File ~/conda/envs/python311/lib/python3.11/site-packages/lca_algebraic/params.py:1209, in _expanded_names_to_names(param_names)
1207 missing = param_names - set(res.keys())
1208 if len(missing) > 0:
-> 1209 raise Exception("Unkown params : %s" % missing)
1211 return {param.name for param in res.values()}

Exception: Unkown params : {'C2H2F4'}

C2H2F4 is a flow indicated in the amount columns when printing the activity. By the way, it is a bit weird to have a mix of "parameters" and value returned by this printAct function.

agb.printAct(act2)

An idea on how to solve this problem?

[raphaeljolivet]

Hi Romain,

My guess is that it's linked to "chemical formulas" being imported in the "formula" properties on exchanges.

It was reported already.
I provide a code to clean it :
#44

It was also fixed in more recent version of bw2io :
brightway-lca/brightway2-io#247

[RomainBes]

Good guess. Thanks for the code to clean it.