Question about timedomain

[harryxhr]

Hi, Dr Lu lu
i am a student trying to use DeepXDE to solve ODEs. Really thanks for your great work.
It seems like the PINN only valid for small interval. i am working on van der pol equation. if i use the Timedomain as [0,5], the results is very accurate. But when i increase the domain to [0,30] the prediction results converge to zero very quickly which is not correct.
I am not sure if is common problem for PINN as it will perform bad when using large interval? Is there someways to fix this?
Best regards

[lululxvi]

There are some ways to improve it, but it is still an open problem for PINN.

[haoranxux]

Thanks so much for your reply!