Span-Based Constituency Parsing with a Structure-Label System and Provably Optimal Dynamic Oracles
Table 4: Comparison of performance of different parsers on PTB test set. †Neural. *Greedy. ‡External embeddings.
['Closed Training & Single Model', 'LR', 'LP', 'F1']
Despite being a greedy parser, when trained using dynamic oracles with exploration, it achieves the best F1 score of any closed-set single-model parser.