Performance calculation of the used models
| Models | PSO-based Grey model | CS-based Grey model |
|---|---|---|
| Population size | Swarm size (25) | Nests (25) |
| Convergence epochs | 100 | 100 |
| Lower bound | −100 | −100 |
| Upper bound | 100 | 100 |
| self-confidence factor | 2 | – |
| swarm confidence factor | 2 | – |
| inertia weight | 0.9-0.4 | – |
| Discovering rate of alien eggs | – | 0.25 |
| Performance indices | ||
| E | 0.95 | 0.99 |
| RMSE | 1.91 | 1.09 |
| Residual | ±4 μm | ±2 μm |
| Models | PSO-based Grey model | CS-based Grey model |
|---|---|---|
| Population size | Swarm size (25) | Nests (25) |
| Convergence epochs | 100 | 100 |
| Lower bound | −100 | −100 |
| Upper bound | 100 | 100 |
| self-confidence factor | 2 | – |
| swarm confidence factor | 2 | – |
| inertia weight | 0.9-0.4 | – |
| Discovering rate of alien eggs | – | 0.25 |
| Performance indices | ||
| E | 0.95 | 0.99 |
| RMSE | 1.91 | 1.09 |
| Residual | ±4 | ±2 |