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The effect of the attention mechanism on performance.
| Attention mechanism | Precision (%) | Recall (%) | F-measure (%) |
| Without attention | 55.1 | 71.3 | 62.2 |
| Additive attention | 55.9 | 70.3 | 62.3 |
| General attention | 55.3 | 71.8 | 62.5 |
| Scaled dot-product attention | 54.9 | 73.3 | 62.8 |
| Multihead attention | 56.3 | 72.7 | 63.5 |
