Research Article
The Prediction of Metro Shield Construction Cost Based on a Backpropagation Neural Network Improved by Quantum Particle Swarm Optimization
Table 7
The topological structures of the different network models.
| Model | Number of hidden layers | Number of hidden layer nodes | | (%) | | |
| BP | 1 | 12 | 0.8531 | 37.89 | 263.8791 | 130.13 | 15 | 0.8867 | 26.16 | 153.3810 | 78.31 | 18 | 0.9152 | 11.84 | 54.9819 | 53.56 | 2 | 12–4 | 0.8993 | 20.37 | 139.3117 | 58.48 | 12–6 | 0.9205 | 10.48 | 48.5281 | 34.76 | 12–8 | 0.9241 | 9.38 | 46.3189 | 32.18 |
| GA-BP | 1 | 12 | 0.9532 | 9.37 | 31.3819 | 28.37 | 15 | 0.9648 | 6.39 | 27.9042 | 23.56 | 18 | 0.9761 | 4.75 | 22.3047 | 20.68 | 2 | 12–4 | 0.9713 | 5.17 | 27.3134 | 16.49 | 12–6 | 0.9848 | 4.31 | 20.8443 | 15.01 | 12–8 | 0.9910 | 3.48 | 17.3611 | 16.31 |
| PSO-BP | 1 | 12 | 0.9798 | 8.31 | 37.3428 | 26.44 | 15 | 0.9831 | 4.48 | 23.189 | 15.31 | 18 | 0.9920 | 2.83 | 12.8864 | 12.76 | 2 | 12–4 | 0.9847 | 5.30 | 30.3197 | 17.50 | 12–6 | 0.9945 | 4.31 | 20.5610 | 12.89 | 12–8 | 0.9921 | 2.30 | 9.3819 | 6.15 |
| QPSO-BP | 1 | 12 | 0.9894 | 2.06 | 9.150 | 8.367 | 15 | 0.9931 | 1.47 | 7.679 | 6.890 | 18 | 0.9980 | 1.29 | 6.436 | 6.078 | 2 | 12–4 | 0.9942 | 1.37 | 7.037 | 6.401 | 12–6 | 0.9982 | 1.25 | 5.936 | 5.568 | 12–8 | 0.9985 | 1.23 | 5.789 | 5.278 |
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