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Table 3 

Feature templates used for the phrase chunking task. wi, ti, and yi are defined as before.

Word-Token–based Features: 
{wi − 2, wi − 1, wi, wi + 1, wi + 2, wi − 1wi, wiwi + 1
×{yi, yi − 1yi
Part-of-Speech (POS)–based Features: 
{ti − 1, ti, ti + 1, ti − 2ti − 1, ti − 1ti, titi + 1, ti + 1ti + 2, ti − 2ti − 1ti, ti − 1titi + 1, titi + 1ti + 2
×{yi, yi − 1yi
Word-Token–based Features: 
{wi − 2, wi − 1, wi, wi + 1, wi + 2, wi − 1wi, wiwi + 1
×{yi, yi − 1yi
Part-of-Speech (POS)–based Features: 
{ti − 1, ti, ti + 1, ti − 2ti − 1, ti − 1ti, titi + 1, ti + 1ti + 2, ti − 2ti − 1ti, ti − 1titi + 1, titi + 1ti + 2
×{yi, yi − 1yi
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