A Joint Named-Entity Recognizer for Heterogeneous Tag-setsUsing a Tag Hierarchy
Table 4: F1 in the tag-set extension experiment, averaged over extending datasets for every base dataset.
['F1 AVERAGE Extending Tag', 'Base Dataset', 'Model  [BOLD] Hier', 'Model  [BOLD] Indep', 'Model  [BOLD] MTL']
For the three models tested, this experiment yields 96 results. But, applying a shared tagging layer on top of a shared text representation boosts the model’s capability and stability. Indeed, overall, MHier outperforms the other models in most tests, and in the rest it is similar to the best performing model.