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Table 4 Summary of the feature settings. (The w denotes the window size. If the value is absent, only feature of the current token is used. The n denotes the n of the n-gram. The ‘len’ denotes the length of affixes. The matching features denote the result of controlled vocabulary matching)
| Set | Token | Norm-token | n-gram | character affix | capitalization | POS/Chunk | Matching |
|---|---|---|---|---|---|---|---|
| #1-context | w = 3 | w = 3 | |||||
| #2-morph | w = 3 | w = 3 | len = 2~3 w = 3 | ||||
| #3-i2b2 | w = 5 | w = 5 | n = 2 w = 5 | len = 2~7 w = 3 | w = 1 | ||
| #3-snuh | w = 5 | w = 3 | n = 2 w = 5 | len = 2~3 | modifier /control | ||
| #3-conll | w = 5 | len = 3~4 w = 5 | w = 5 | n = 1 |
