We introduce a Robust version of the Physics-Informed Neural Networks (RPINNs) to approximate the Partial Differential Equations (PDEs) solution. Standard Physics Informed Neural Networks (PINN) takes into account the governing physical laws described by PDE during the learning process. The network is trained on a data set that consists of randomly selected points in the physical domain and its boundary. PINNs have been successfully applied to solve various problems described by PDEs with boundary conditions. The loss function in traditional PINNs is based on the strong residuals of the PDEs. This loss function in PINNs is generally not robust with respect to the true error. The loss function in PINNs can be far from the true error, which makes the training process more difficult. In particular, we do not know if the training process has already converged to the solution with the required accuracy. This is especially true if we do not know the exact solution, so we cannot estimate the true error during the training. This paper introduces a different way of defining the loss function. It incorporates the residual and the inverse of the Gram matrix, computed using the energy norm. We test our RPINN algorithm on two Laplace problems and one advection-diffusion problem in two spatial dimensions. We conclude that RPINN is a robust method. The proposed loss coincides well with the true error of the solution, as measured in the energy norm. Thus, we know if our training process goes well, and we know when to stop the training to obtain the neural network approximation of the solution of the PDE with the true error of required accuracy.

我们介绍了一种鲁棒版本的物理启发式神经网络（RPINN）来近似求解偏微分方程（PDEs），该方法利用能量范数计算的残差和格拉姆矩阵的倒数构建了损失函数，在两个空间维度的拉普拉斯问题和对流扩散问题中进行了测试，结果表明RPINN是一种鲁棒的方法，其损失函数与解的真实误差在能量范数下相符，因此我们可以知道训练过程进行得如何，并在达到所需精度的真实误差下停止训练来获得PDE解的神经网络逼近。

鲁棒的物理信息神经网络