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Repository to track the progress in Natural Language Processing (NLP), including the datasets and the current state-of-the-art for the most common NLP tasks.

CCG supertagging

Combinatory Categorical Grammar (CCG; Steedman, 2000) is a highly lexicalized formalism. The standard parsing model of Clark and Curran (2007) uses over 400 lexical categories (or supertags), compared to about 50 part-of-speech tags for typical parsers.


Vinken , 61 years old
N , N/N N (S[adj]\ NP)\ NP


The CCGBank is a corpus of CCG derivations and dependency structures extracted from the Penn Treebank by Hockenmaier and Steedman (2007). Sections 2-21 are used for training, section 00 for development, and section 23 as in-domain test set. Performance is only calculated on the 425 most frequent labels. Models are evaluated based on accuracy.

Model Accuracy Paper / Source
Clark et al. (2018) 96.1 Semi-Supervised Sequence Modeling with Cross-View Training
Lewis et al. (2016) 94.7 LSTM CCG Parsing
Vaswani et al. (2016) 94.24 Supertagging with LSTMs
Low supervision (S√łgaard and Goldberg, 2016) 93.26 Deep multi-task learning with low level tasks supervised at lower layers
Xu et al. (2015) 93.00 CCG Supertagging with a Recurrent Neural Network

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