KeyError for post-processing variables / evalfn

[stephenwkroper]

Opening an issue as a new user looking to robustify a large SP model. The nominal model solves using GPkit, but when converting to a RobustModel I've been getting KeyErrors. This seems to be related to select parameters that are setup as post-processing variables (that also happen to use evalfn) - the RobustModel solves when these variables are commented out. @bqpd

[1ozturkbe]

Frankly, I have never used evalfn, so I don't know how it plays with GPkit variables. Can you post a full stack trace? It is hard to help without a MWE or specific error messages.

[1ozturkbe]

Have you resolved this issue? Let me know, and please make a PR as necessary if you have.

[bqpd]

My guess would be that it's something between how robust creates variables and how evalfn accepts input...would be happy to fix if I could reproduce it!

[stephenwkroper]

Hi Berk and Ned, Sorry for the delay and I appreciate the follow-up. I haven't looked further into the issue on my end yet but have attached the error trace for reference (and to Ned's point, I've also had issues replicating this error on simpler/smaller models..). What that being said, this may just be a low priority item we can close for now (until I have a full example to share). Thanks, Stephen

…

________________________________ From: Ned Burnell ***@***.***> Sent: Thursday, December 23, 2021 4:03 PM To: convexengineering/robust ***@***.***> Cc: Stephen Roper ***@***.***>; Author ***@***.***> Subject: Re: [convexengineering/robust] KeyError for post-processing variables / evalfn (Issue #60) My guess would be that it's something between how robust creates variables and how evalfn accepts input...would be happy to fix if I could reproduce it! — Reply to this email directly, view it on GitHub<https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fconvexengineering%2Frobust%2Fissues%2F60%23issuecomment-1000522489&data=04%7C01%7Cstephen.roper%40queensu.ca%7C81986b2c4ce04f95bdfd08d9c657b4f4%7Cd61ecb3b38b142d582c4efb2838b925c%7C1%7C0%7C637758902277091474%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=HqZPWOmeZcrQtIUjXvRuv9YBI49eoSQcU15nQUOa3Fs%3D&reserved=0>, or unsubscribe<https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Fnotifications%2Funsubscribe-auth%2FAMXWQJ2JDXOM2FHFMCYEBFTUSOFDBANCNFSM5IH7P3EQ&data=04%7C01%7Cstephen.roper%40queensu.ca%7C81986b2c4ce04f95bdfd08d9c657b4f4%7Cd61ecb3b38b142d582c4efb2838b925c%7C1%7C0%7C637758902277091474%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=LrmrtbmLbSdx4oVYQGZu%2FFWsO4YalPGh59WKBY%2Fq9Es%3D&reserved=0>. 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You are receiving this because you authored the thread.Message ID: ***@***.***> c:\users\stephen.roper\desktop\code_vault\robust\robust\robust.py:157: UserWarning: Equality constraints will not be robustified. warnings.warn('Equality constraints will not be robustified.') iteration 1 Traceback (most recent call last): File "c:\users\stephen.roper\desktop\code_vault\robust\robust\robust.py", line 197, in setup self.robust_solve_properties['numoflinearsections'], new_solution, self._robust_model = self. \ File "c:\users\stephen.roper\desktop\code_vault\robust\robust\robust.py", line 422, in find_number_of_piece_wise_linearization sol_upper = RobustModel.internalsolve(model_upper, verbosity=0) File "c:\users\stephen.roper\desktop\code_vault\robust\robust\robust.py", line 459, in internalsolve return model.solve(verbosity=verbosity) File "c:\users\stephen.roper\desktop\code_vault\gpkit\gpkit\constraints\prog_factories.py", line 135, in solvefn self.process_result(result) File "c:\users\stephen.roper\desktop\code_vault\gpkit\gpkit\constraints\set.py", line 192, in process_result val = v.evalfn(result["variables"]) File "C:\Users\stephen.roper\Desktop\hops\hops\models\hyperloop.py", line 215, in <lambda> wcpp_fun = lambda v: sum(v(self.SystemCost.CAPEX.capexperpaxkm)*v(self.Route.throughputweightingfactor)) File "c:\users\stephen.roper\desktop\code_vault\gpkit\gpkit\keydict.py", line 161, in __call__ got = self[key] File "c:\users\stephen.roper\desktop\code_vault\gpkit\gpkit\keydict.py", line 176, in __getitem__ raise KeyError(key) KeyError: HyperloopSystem.SystemCost.CAPEX.capexperpaxkm[:] During handling of the above exception, another exception occurred: Traceback (most recent call last): File "save.py", line 8, in <module> c = case() File "C:\Users\stephen.roper\Desktop\hops\hops\cases.py", line 63, in __init__ super().__init__(*args) File "C:\Users\stephen.roper\Desktop\hops\hops\cases.py", line 25, in __init__ self.rsol = RobustModel(self.hl, "box").robustsolve(verbosity=1) File "c:\users\stephen.roper\desktop\code_vault\robust\robust\robust.py", line 237, in robustsolve self.setup(verbosity, **options) File "c:\users\stephen.roper\desktop\code_vault\robust\robust\robust.py", line 201, in setup self.robust_solve_properties['numoflinearsections'], new_solution, self._robust_model = self. \ File "c:\users\stephen.roper\desktop\code_vault\robust\robust\robust.py", line 422, in find_number_of_piece_wise_linearization sol_upper = RobustModel.internalsolve(model_upper, verbosity=0) File "c:\users\stephen.roper\desktop\code_vault\robust\robust\robust.py", line 459, in internalsolve return model.solve(verbosity=verbosity) File "c:\users\stephen.roper\desktop\code_vault\gpkit\gpkit\constraints\prog_factories.py", line 135, in solvefn self.process_result(result) File "c:\users\stephen.roper\desktop\code_vault\gpkit\gpkit\constraints\set.py", line 192, in process_result val = v.evalfn(result["variables"]) File "C:\Users\stephen.roper\Desktop\hops\hops\models\hyperloop.py", line 215, in <lambda> wcpp_fun = lambda v: sum(v(self.SystemCost.CAPEX.capexperpaxkm)*v(self.Route.throughputweightingfactor)) File "c:\users\stephen.roper\desktop\code_vault\gpkit\gpkit\keydict.py", line 161, in __call__ got = self[key] File "c:\users\stephen.roper\desktop\code_vault\gpkit\gpkit\keydict.py", line 176, in __getitem__ raise KeyError(key) KeyError: HyperloopSystem.SystemCost.CAPEX.capexperpaxkm[:]

[1ozturkbe]

Huh interesting. @bqpd up to you; I will not have the bandwidth to look into this for some time!