Research Article
The Prediction of Metro Shield Construction Cost Based on a Backpropagation Neural Network Improved by Quantum Particle Swarm Optimization
Table 3
Optimization calculation process of the QPSO.
| Iteration (n) | Fitness (n − 1) | Fitness (n) | Fitness (n) − Fitness (n − 1) | Result |
| 147 | 2.388799 | 2.388799 | 0 < 0.00001 | Continue | 148 | 2.388799 | 2.388807 | 0.000008 < 0.0001 | Continue | 149 | 2.388807 | 2.388807 | 0 < 0.0001 | Continue | 1000 | 2.388807 | 2.388807 | 0 < 0.0001 | Stop |
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