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Evaluation:

Table 3 shows the result for several values of the principal parameters. The baseline, (assign an element its most frequent category: O, I-NP or B-NP) provides an F1-score of 80.13. These results were obtained without using lexicalized information (W feature in the example Figure 1).


Table 3: Influence of some parameters.
$\theta $ 0.9 0.85 0.80 0.75 0.75 0.5 0.5  
length of the context 2 2 2 2 1 2 1  
nb rules 1144 930 884 811 361 1122 592  
nb exceptions 192 230 287 297 134 669 357  
F w/o excep 88.79 90.19 89.12 89.28 88.08 88.21 87.61  
F with excep 88.93 90.31 90.47 90.62 89.26 90.70 90.07  



next up previous
Next: The effect of refinement: Up: First Experiment Previous: Presentation of the task
Hammerton J. 2002-03-13