Table 3 The overview of the corrected CHEMDNER corpus in terms of the number of PubMed abstracts (#Articles), the number of CEMs (#CEMs), and the number of CEMs for each of the CEM classes in C = {SYSTEMATIC, IDENTIFIER, FORMULA, TRIVIAL, ABBREVIATION, FAMILY, MULTIPLE, NO CLASS} × means the resulting figure is unknown.
From: A CRF-based system for recognizing chemical entity mentions (CEMs) in biomedical literature
| Â | Training | Development | Test | Background |
|---|---|---|---|---|
#Articles | 3,500 | 3,500 | 3,000 | 17,000 |
#CEMs | 29,478 | 29,485 | 25,351 | × |
ABBREVIATION | 4,538 | 4,517 | 4,059 | × |
FAMILY | 4,090 | 4,212 | 3,622 | × |
FORMULA | 4,448 | 4,117 | 3,443 | × |
IDENTIFIER | 672 | 639 | 513 | × |
MULTIPLE | 202 | 187 | 199 | × |
SYSTEMATIC | 6,656 | 6,814 | 5,666 | × |
TRIVIAL | 8,832 | 8,967 | 7,808 | × |
NO CLASS | 40 | 32 | 41 | × |