Shift-Reduce Constituent Parsing with Neural Lookahead Features
Table 9: Comparison between the parsers with lookahead features on different phrases types, with the corresponding constituent hierarchy predictor performances.
['baseline', 'baseline', 'NP 92.06', 'VP 90.63', 'S 90.28', 'PP 87.93', 'SBAR 86.93', 'ADVP 84.83', 'ADJP 74.12', 'WHNP 95.03', 'QP 89.32']
As the results show, while the parser with lookahead features achieves improvements on all of the frequent phrase types, there are relatively more improvements on constituent VP, S, SBAR and WHNP.