Meaning of parameters Stage 2

[leonardo.pulga]

Hi,

may ask you if parameters 1-4 correspond (in order) to M,T,C,Fe at page 8 of the linked paper (doi:10.1016/j.jcp.2019.07.029) ?

Thank you in advance !
Best Regards,
Leo

[discourse-admin]

Hello Leo,

Sorry, but the parameters we left the parameters unnamed on purpose to provide more of a challenge. That being said, the Guan and Novosselov (2019) paper is an excellent resource for Stage 2. Best of luck.

Team Xeek

[hengcherkeng235]

i find it quite impossible to do without knowing the meaning of the parameters.
i already find the analytic form of the potential function and can fit exactly the train data using my own parameterization. i cannot use the 4 parameters provided. Does anyone have any hints?

more importantly, i find that the potential curve in train sample 0 and train sample 1 are exactly the same. But their parameters are different. This shows that the train parameterization provided is perhaps not unique ?

[gru.dam]

@hengcherkeng235

more importantly, i find that the potential curve in train sample 0 and train sample 1 are exactly the same. But their parameters are different. This shows that the train parameterization provided is perhaps not unique ?

In this case that is not possible to build a model without the understanding of underlaid physics.

hengcherkeng235 if you don’t mind sharing some resources that you used (if any) to have a better understanding of stage 2 that would be greatly appreciated. I find Guan and Novosselov (2019) paper too difficult for someone without background on this topic.

[discourse-admin]

@gru.dam

Thanks for your comment. We wanted Stage 1 and Stage 2 to be more of a learning about PDEs and the Poisson-Boltzmann equation, but clearly, we are frustrating users. Please look for an update to Stage 2 next week to help unblock you.

Team Xeek

[jc138691]

We need to solve a PDE with boundary conditions. So we need the actual PDE (Eq??? in the paper from your stage2 notebook) and the boundary conditions? p1, p2, p3, p4? What is the point in us trying to guess what you want us to do? Could you just say it clearly?

[discourse-admin]

Thanks for communicating your frustration. We are preparing an update for later this week that will be announced here and on the main page for Stage 2.

[discourse-admin]

@jc138691 and @gru.dam please see the updated post here on parameters for Stage 2:

Update to Stage 2 Parameters

There has been a request from the Community to shed more light on the unnamed parameters for Stage 2. When building this challenge, we thought that the challenge would be too easy if the parameters were named. It turns out we made it too hard by not naming them. So, here is the list of parameters that were used to build the train and test data for Stage 2: P1 = Temperature P2 = Charge P3 = Conversion Factor P4 = Voltage Best of luck with Stage 2!

[jc138691]

Could you please check on your scoring side? If I submit all zeros, the score is 0.3301466. If one edge is set with your voltages (boundary condition), then the score is 0.331151. The score is RMSE, so it should be lower/better since the boundary conditions are known. I tried +/- voltage. Did you give us the correct test file voltages?