Dependency-Guided LSTM-CRF for Named Entity Recognition
Table 9: Ablation study of the DGLSTM-CRF model on the OntoNotes English dataset.
['[BOLD] Model', '[BOLD] Prec.', '[BOLD] Rec.', '[BOLD] F [BOLD] 1']
With self connection as interaction function, the F1 drops 0.3 points. The model achieves comparable performance with concatenation as interaction function but F1 drops about 0.4 points with the addition interaction function. We believe that the addition potentially leads to certain information loss. Without the dependency relation embedding vr in the input representation, the F1 drops about 0.4 points.