An overview of the BIOASQ large-scale biomedical semantic indexing and question answering competition

BMC Bioinformatics

Table 12 Technologies used in Task 1a from the participating systems along with the feature representation of the documents

Reference	Approach	Technologies	Features
[32]	flat	SVMs, MetaLabeler [44]	unigrams, bigrams
[37]	hierarchical	SVMs, Bayes networks	unigrams, bigrams
[45]	flat	MetaMap [46],	unigrams
		information retrieval,
		search engines
[48]	flat	k-NN, SVMs	unigrams, bigrams,
			trigrams
[49]	flat	k-NN, learning-to-rank	unigrams

ISSN: 1471-2105