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