---
title: "Revisiting Supertagging for Faster HPSG Pasing (2023)"
description: "HPSG parsers built on large hand-written precision grammars give very detailed analyses… 97.26% accuracy on 950 WSJ23. 58 references."
authors: ["Olga Zamaraeva", "Carlos Gomez-Rodriguez"]
year: 2023
venue: "arXiv:2309.07590"
source: "https://arxiv.org/abs/2309.07590"
doi: "10.48550/arxiv.2309.07590"
arxiv: "2309.07590"
licence: "CC BY 4.0 (arXiv)"
licence_url: "http://creativecommons.org/licenses/by/4.0/"
summary_licence: "Elamur Cosmic License"
canonical: "https://research.elamur.ai/free/en/papers/zamaraeva-2023-revisiting-supertagging-faster-hpsg-pasing/"
---
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# Revisiting Supertagging for Faster HPSG Pasing

**Authors:** [Olga Zamaraeva](https://md.research.elamur.ai/free/en/authors/olga-zamaraeva/) and [Carlos Gomez-Rodriguez](https://md.research.elamur.ai/free/en/authors/carlos-gomez-rodriguez/) · **Year:** 2023 · **Venue:** arXiv:2309.07590 · **Licence:** [CC BY 4.0 (arXiv)](http://creativecommons.org/licenses/by/4.0/)

**Links:** [Publisher's page](https://arxiv.org/abs/2309.07590) · [PDF](https://arxiv.org/pdf/2309.07590) · [DOI 10.48550/arxiv.2309.07590](https://doi.org/10.48550/arxiv.2309.07590) · [arXiv 2309.07590](https://arxiv.org/abs/2309.07590) · [OpenAlex](https://openalex.org/W4386794771)

**Citations:** 0 citations (OpenAlex, 2026-10-14)

## Summary
HPSG parsers built on large hand-written precision grammars give very detailed analyses, but they are slow and memory-hungry. A single sentence often takes more than a second, and long sentences can exhaust RAM. The authors return to supertagging, which means predicting a fine-grained lexical type for each token and then pruning the parse chart before unification begins. They train SVM, neural CRF (NCRF++) and fine-tuned BERT taggers on the 2023 English Resource Grammar (ERG) treebanks and compare them with an older MaxEnt baseline. The best BERT tagger is then plugged into the lexical-analysis stage of a DELPH-IN parser. It keeps only the top tag per token, except for a list of word classes that are never pruned.

Compared with parsing without tags, the system is about three times faster and also more accurate on the dependency-based EDM metric. A production-integrated ubertagger remains faster, but it is usually less accurate. The results differ noticeably across domains. The work matters because it makes high-precision, grammar-derived treebanks cheaper to produce, and it releases the ERG data in Huggingface token-classification format.

## Key points
- The training and evaluation data come from the ERG 2023 release: 30 treebanked corpora with over 1.5M tokens and 105,155 sentences. The genres include news, Wikipedia, fiction, emails, phone transcripts, technical essays and phenomenon test suites.
- The ERG defines 43,505 lexical types, of which only 1,299 occur in the training portion. The Penn Treebank tagset, by comparison, has 48 tags.
- The fine-tuned BERT tagger reaches 97.26% accuracy on 950 WSJ23 sentences. On the out-of-domain essay The Cathedral and the Bazaar (cb) it reaches 93.88%.
- With the tagger integrated, parsing is roughly 3× faster than with no tagging, and recall and precision improve on most datasets. The ubertagger is about 12× faster on average but loses accuracy.
- On e-commerce data, tagging helps least. The supertagger gains 6% in speed at a cost of 3% F-score, while the ubertagger loses 16% F-score.

## Interesting ideas
- The tagger keeps a single best label to maximise pruning but exempts a hand-picked set of 15 word classes, so the risky cases keep their full ambiguity.
- The tags are rich grammar lexical types that encode syntactic behaviour such as subcategorisation, rather than coarse POS, so the tagger does part of the parser's work in advance.
- The treebank is regenerated by the grammar itself, so a fix in the grammar spreads systematically through all the data without any manual re-annotation.
- The tagger is judged by downstream parse quality (EDM precision and recall) and speed, not only by tag accuracy, because one wrong tag can sink an entire sentence.
- The evaluation covers many genres plus constructed phenomenon suites, and it shows that results vary even across in-domain sets.

## For Mova

How these ideas could serve Mova, our small open language model — its files, stages and tests:

- **I1** (tree): the perceptron parser and gparse could prune candidate heads and labels using tagger confidence, while leaving known trouble classes (e.g. particles, wh-words) unpruned to avoid sentence-level failures.
- **I2** (tokens): crate en could predict verb-frame-like lexical subtypes alongside UPOS, which would narrow the parser's options and later feed VerbNet role assignment.
- **I3** (learn): self-induced repair rules could be applied as a re-derivation pass over silver data, so that one correction updates the whole corpus consistently.
- **I4** (learn): tagger and parser changes could be scored by their effect on final frames or answers, with per-domain breakdowns.
- **I5** (answer): the test sets for fables, maths problems and school tests could be reported separately, together with small targeted phenomenon suites (e.g. control, raising), instead of a single averaged score.

*Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.*

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- [Universidade da Coruña](https://md.research.elamur.ai/free/en/universities/universidade-da-coruna/) — University, A Coruña, Spain · 14 works · 328 citations

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## Cite

Cite as: Olga Zamaraeva and Carlos Gomez-Rodriguez. 2023. Revisiting Supertagging for Faster HPSG Pasing. arXiv:2309.07590.

The paper itself, not this page. BibTeX from the library's record of the work.

```bibtex
@misc{zamaraeva2023revisiting,
  title = {{Revisiting Supertagging for Faster HPSG Pasing}},
  author = {Olga Zamaraeva and Carlos Gomez-Rodriguez},
  year = {2023},
  doi = {10.48550/arxiv.2309.07590},
  eprint = {2309.07590},
  archivePrefix = {arXiv},
  url = {https://doi.org/10.48550/arxiv.2309.07590}
}
```

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*Updated 2 November 2026*
