TABLE VI. Comparison of Classification Performance Yielded by Networks Trained With Different Online Strategies Against Imbalanced Data. (Abbraviations: PRE.: Precision, REC.: Recall (%); Neg.: Negative, and Pos.: Positive; T. P.: Training Period).
| COVID-19 classification network trained w/ | No online strategy | Oversampling | OHEM [10] | Focal loss [11] | |
|---|---|---|---|---|---|
| ALL Neg. (1785) + 246 Pos. | PRE. | 81.5 | 86.3 | 91.3 | 86.0 |
| REC. | 88.0 | 88.0 | 84.0 | 86.0 | |
| F1 | 84.6 | 87.1 | 87.5 | 86.0 | |
| T. P. | 19.6 hours | 34.3 hours | 19.6 hours | 19.6 hours | |
| 56% selected Neg. (1000) + 246 Pos. | PRE. | 93.0 | 93.3 | 88.2 | 95.2 |
| REC. | 80.0 | 84.0 | 90.0 | 80.0 | |
| F1 | 86.0 | 88.4 | 89.1 | 87.0 | |
| T. P. | 9.5 hours | 15.8 hours | 9.5 hours | 9.5 hours | |