Table 5 Features used for IMT
Feature | Feature type | Description |
|---|---|---|
Perfect match (2 features) | Binary | For each node, checks if (1) the concept name or (2) any synonym name appears in the article |
Term match (4 features) | Binary | For each node, checks if any unigram/bigram in the node’s (1, 2) concept name or (3, 4) synonyms appears in the article |
Term match ratio (4 features) | Continuous | For each node, the ratio unigram/bigram in the node’s (1, 2) concept name or (3, 4) synonyms that appears in the article |
Matched terms mutual information sum (4 features) | Continuous | Sum of mutual information score of each matching uni-gram/bigram in the node’s (1, 2) concept name or (3, 4) any synonym. |
Matched term chi-squared sum (4 features) | Continuous | Sum of chi-squared value of each matching unigram/bigram in the node’s (1, 2) concept name or (3, 4) any synonym. |
Node popularity | Integer | The number of times this node is annotated in the training data |
Regex annotation | Binary | Checks if the regular expression-based annotator that was provided by the organizers of BioCreative III annotates the current article-ontology node pair |
Keyword presence | Binary | Checks if the keyword for the ontology node appears in the article |