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. 2015 Jan 19;7(Suppl 1):S4. doi: 10.1186/1758-2946-7-S1-S4

Table 4.

Character-based feature sets in CRFs model.

Character feature Wi-4, Wi-3, Wi-2, Wi-1, Wi, Wi+1, Wi+2, Wi+3, Wi+4
2-gram character feature Wi-1i, Wii+1

3-gram character feature Wi-2i, Wi-1i+1, Wii+2

4-gram character feature Wi-3i, Wi-2i+1, Wi-1i,Wii+1

5-gram character feature Wi-4i, Wi-3i+1, Wi-2i+2, Wi-1i+3, Wii+4