Tipc ips gapfix 0704

[wangguan1995]

• Fix large IPS performance gap in Eular beam case between torch and paddle
• Keep the loss of torch code aligned with PaddleScience in the Cylinder2d case
• Update and merge the Paddlebenchmark/deepxde code and lululxvi/deepxde code

[paddle-bot[bot]]

Thanks for your contribution! Please wait for the result of CI firstly.