Discriminative Lexical Semantic Segmentation with Gaps: Running the MWE Gamut
Summary
The paper addresses the automatic identification of multiword expressions (MWEs) in running English text. It covers the full range of MWE types, from proper names and compounds to phrasal verbs, support-verb constructions and fixed phrases. Earlier work typically targeted one MWE subclass at a time and handled only contiguous sequences. The authors start from a corpus of web reviews fully annotated for MWEs, with discontinuous ("gappy") expressions and a strong/weak strength distinction. They restrict gaps with two linguistic constraints: projectivity and no nested gaps. Under these constraints, the segmentation can be encoded as an extended BIO-style chunking tag set, so efficient sequence-tagging inference becomes possible. On top of this encoding they train a feature-rich discriminative first-order sequence tagger. Its features draw on WordNet and other multiword lexicons as well as unsupervised word clusters. They also propose a matching evaluation measure. The tagger reaches close to 60% F1 and clearly outperforms segmentation by lexicon lookup alone. This makes it the first supervised, general-purpose MWE identifier, and both data and code are released openly.
Key points
- The data is the MWE-annotated portion of the English Web Treebank (WTB) reviews: 723 documents, 3,812 sentences and about 55,000 tokens, with 3,483 MWE instances covering roughly 15% of tokens.
- The representation allows gappy MWEs under projectivity and no-nesting constraints. It is formalized as an extended CFG and distinguishes strong (idiomatic) MWEs from weak (collocational) ones.
- The model is a discriminative structured tagger whose only first-order feature is the previous label. Its features include lexical, POS, lemma and WordNet/multiword-lexicon features, plus word clusters.
- MWE identification reaches nearly 60% F1, far above heuristic lexicon lookup.
- The corpus and software are available at ark.cs.cmu.edu/LexSem (TACL 2, 2014).
Cited by
- Extracting Headless MWEs from Dependency Parse Trees: Parsing, Tagging, and Joint Modeling Approaches
- A Dependency Parser for Tweets
- Survey: Multiword Expression Processing: A Survey
- Comprehensive Annotation of Multiword Expressions in a Social Web Corpus
- A Lexical Resource of Hebrew Verb-Noun Multi-Word Expressions
- Lexicalised and non-lexicalized multi-word expressions in WordNet: a cross-encoder approach
- A Curious Class of Adpositional Multiword Expressions in Korean
- A Corpus and Model Integrating Multiword Expressions and Supersenses
- SemEval-2016 Task 10: Detecting Minimal Semantic Units and their Meanings (DiMSUM)
Cite
@article{schneider2014discriminative,
title = {{Discriminative Lexical Semantic Segmentation with Gaps: Running the MWE Gamut}},
author = {Schneider, Nathan and Danchik, Emily and Dyer, Chris and Smith, Noah A.},
journal = {Transactions of the Association for Computational Linguistics},
year = {2014},
doi = {10.1162/tacl\_a\_00176},
url = {https://doi.org/10.1162/tacl_a_00176}
}References
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