Research Article
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 |
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