Physics-informed neural network (PINN) is a data-driven solver for partial and ordinary differential equations(ODEs/PDEs). It provides a unified framework to address both forward and inverse problems. However, the complexity of the objective function often leads to training failures. This issue is particularly prominent when solving high-frequency and multi-scale problems. We proposed using transfer learning to boost the robustness and convergence of training PINN, starting training from low-frequency problems and gradually approaching high-frequency problems. Through two case studies, we discovered that transfer learning can effectively train PINN to approximate solutions from low-frequency problems to high-frequency problems without increasing network parameters. Furthermore, it requires fewer data points and less training time. We elaborately described our training strategy, including optimizer selection, and suggested guidelines for using transfer learning to train neural networks for solving more complex problems.

提供了使用转移学习来增强PINN的鲁棒性和收敛性的训练方法，通过两个案例研究发现转移学习可以有效训练PINN在低频问题到高频问题的近似解，同时减少了网络参数，所需数据点和训练时间。同时提供了优化器选择和使用转移学习解决更复杂问题的指南。

基于物理知识的神经网络在高频和多尺度问题上的应用及迁移学习