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Table 3

Feature templates used for the phrase chunking task. w_i, t_i, and y_i are defined as before.

Word-Token–based Features:

{w_{i − 2}, w_{i − 1}, w_i, w_{i + 1}, w_{i + 2}, w_{i − 1}w_i, w_iw_{i + 1}}

×{y_i, y_{i − 1}y_i}

Part-of-Speech (POS)–based Features:

{t_{i − 1}, t_i, t_{i + 1}, t_{i − 2}t_{i − 1}, t_{i − 1}t_i, t_it_{i + 1}, t_{i + 1}t_{i + 2}, t_{i − 2}t_{i − 1}t_i, t_{i − 1}t_it_{i + 1}, t_it_{i + 1}t_{i + 2}}

×{y_i, y_{i − 1}y_i}

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