Variable linear transformation improved physics-informed neural networks (VLT-PINNs) for thin-layer flow problems.
The code for the paper: Variable linear transformation improved physics-informed neural networks to solve thin-layer flow problems.

In our paper, equation (25) is missing the root signs.

Original equation:

$$ L_2RE_{\varphi} = \frac{ \sum\limits_{i=1}^{n} (\varphi_{i, true} - \varphi_{i, pred})^2 }{ \sum\limits_{i=1}^{n} \varphi^2_{i, true} } $$

Correct equation:

$$ L_2RE_{\varphi} = \frac{ \Vert\varphi_{true} - \varphi_{true}\Vert_2 }{ \Vert\varphi_{true}\Vert_2 } = \frac{ \sqrt{\sum\limits_{i=1}^{n} (\varphi_{i, true} - \varphi_{i, pred})^2} }{ \sqrt{\sum\limits_{i=1}^{n} \varphi^2_{i, true}} } $$