| Number of neurons in the hidden layer | |||||
| 5 | 10 | 15 | |||
BBO | Average | 0.880 | Average | 0.879 | Average | 0.882 |
| Stdv | 0.011 | Stdv | 0.012 | Stdv | 0.012 |
| Best | 0.902 | Best | 0.892 | Best | 0.906 |
GA | Average | 0.858 | Average | 0.833 | Average | 0.833 |
| Stdv | 0.009 | Stdv | 0.011 | Stdv | 0.011 |
| Best | 0.873 | Best | 0.867 | Best | 0.902 |
PSO | Average | 0.785 | Average | 0.785 | Average | 0.768 |
| Stdv | 0.019 | Stdv | 0.022 | Stdv | 0.009 |
| Best | 0.818 | Best | 0.812 | Best | 0.906 |
DE | Average | 0.681 | Average | 0.693 | Average | 0.708 |
| Stdv | 0.043 | Stdv | 0.037 | Stdv | 0.023 |
| Best | 0.740 | Best | 0.741 | Best | 0.751 |
ACO | Average | 0.643 | Average | 0.623 | Average | 0.618 |
| Stdv | 0.043 | Stdv | 0.030 | Stdv | 0.065 |
| Best | 0.743 | Best | 0.671 | Best | 0.709 |
BP | Average | 0.658 | Average | 0.673 | Average | 0.720 |
| Stdv | 0.054 | Stdv | 0.060 | Stdv | 0.045 |
| Best | 0.747 | Best | 0.766 | Best | 0.787 |