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Table 6.
K(2, 2) equation: 
relative error and time cost of PINN(tanh) and PINN(sine).
| Solution | Method | ||
|---|---|---|---|
| PINN(tanh) | PINN(sine) | ERR | |
| u(x, t) |  |
 |
82.85% |
| Time cost | 106 s | 93 s | – |