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在使用 `deepxde` 训练的时候,为了测试一些极端情况,我经常把输入数据设置的极小(接近0)或者超过几百,或者有些写了错误的边界条件、初始条件,这时候训练模型`Train loss`和`Test loss`会出现`nan`,并且立刻停止训练。出现这种情况一般需要截断误差,即如果一旦损失值超过某个界限[lossmax],就直接截断,取预先设定的值。规范化 PDE或分配损失权重( normali…
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### System information
- This concerns a customized script applying PINN
- Runs both (quite well) on Jupyter Notebooks, and Colab
- TF2 (and T1 in other environment) installed using Anaco…
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For simple cases we can just differentiate through the DDE solver but if the DDE system contains parameter-dependent C1-discontinuities the forward sensitivities have jump discontinuities which, e.g.,…
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Hi Dr.Lu
I found a discussion of adaptive activation functions in the open issues, and you mentioned that the "_https://deepxde.readthedocs.io/en/latest/modules/deepxde.maps.html#deepxde.maps.activat…
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@lululxvi Dear Prof. Lu,
Here I just wanted to introduce myself and ask how you would apply a step function as a boundary condition midway trough your process? So if I want to make it a bit clearer, …
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Hello everyone!
I'm trying to model highly oscillatory functions ( like the 2D wave function with a source point) via using FNNs, but I can only get limited accuracy despite using numerous approach…
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Noite sir! Tudo certo? Cara, procurando aqui como fazer essa integração do rtd/dde sem usar o Excel, achei o seu vídeo (show)... Achei o seu Github (show) e achei que vc fez até a integração com TT su…
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Hi Felix
I just upgraded to v0.3.0. (pip install --upgrade xlwings) and I copied the .bas file in my Excel file.
I also update the python program replacing
wb = Workbook(workbook_path) with wp=Workbo…
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Hello,
first, thanks for your excellent work.
Running the Lotka-Volterra Demo using DDE_BACKEND=tensorflow.compat.v1 works fine.
Same program fails, when setting DDE_BACKEND=tensorflow. The compu…
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Dear @lululxvi,
Thank you for your wonderful framework.
I am solving the 2D compressible Euler equation for the flow around a cylinder, where I have to define the slip wall boundary condition for ve…