Unsupervised Chunking Based on Graph Propagation from Bilingual Corpus

Table 5

Chunk tagging evaluation results for various baselines and proposed graph-based model.

Tag	Feature-HMM			Projection			Graph-based
	Pre	Rec	F1	Pre	Rec	F1	Pre	Rec	F1
NP	0.60	0.67	0.63	0.67	0.72	0.68	0.81	0.82	0.81
VP	0.56	0.51	0.53	0.61	0.57	0.59	0.78	0.74	0.76
PP	0.36	0.28	0.32	0.44	0.31	0.36	0.60	0.51	0.55
ADVP	0.40	0.46	0.43	0.45	0.52	0.48	0.64	0.68	0.66
ADJP	0.47	0.53	0.50	0.48	0.58	0.51	0.67	0.71	0.69
SBAR	0.00	0.00	0.00	0.50	1.0	0.66	0.50	1.0	0.66
All	0.49	0.51	0.50	0.57	0.62	0.59	0.73	0.75	0.74