A Novel Approach towards Medical Entity Recognition in Chinese Clinical Text

Table 5

Rules used in the postprocessing module.

Number	Description of postprocessing rules
1	If the label “O” is followed by the label “I,” then, “I” is forcefully resolved to the same-type label “B”
2	If “B” is followed by a different-type label “I,” then, “I” is forcefully resolved to “B,” such as B-WM I-TCM ➔ B-WM B-WM
3	In Chinese ANs, the end of a drug name is rarely followed by another completely different therapeutic drug. In this case, we established the following rules, such as B-WM I-WM B-WM I-WM ➔ B-WM I-WM I-WM I-WM
4	If a drug name entity only contains “),” but not “(,” the starting position of the current drug name entity is moved ahead, while the label “B” is repositioned at the position of “(”
5	If “)” is annotated as label “O” and it immediately follows the end of the Chinese characters of the recognized drug name, then, this field end is expanded by one character to involve “)”; otherwise, the starting position of the field of the drug name is adjusted to be discarded “(”