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GUMSum: Multi-Genre Data and Evaluation for English Abstractive Summarization

Paper · 2023 · Yang Janet Liu and Amir Zeldes

Summary

Neural summarizers write fluent text. They still invent facts, do poorly outside news, and are trained on "found" datasets like XSum and CNN/DM, where many reference texts are not real summaries. Liu and Zeldes address this with GUMSum, a small, carefully built evaluation set. It adds a one-sentence summary to each of the 213 documents in the UD English GUM treebank (V9), which spans 12 written and spoken genres. Summaries follow strict guidelines:

  • They must be able to replace reading the text.
  • They must give who, when, where and how.
  • They must keep the source's own wording.
  • They must not add any entity or fact the text does not state, even a likely true one.

The authors compare XSum-trained SimCLS and BRIO, prompted GPT3 (text-davinci-002), and BRIO fine-tuned on GUM training documents against a second human summary. Every system trails the humans. GPT3 beats the XSum-trained models, but fine-tuning on just 165 documents beats GPT3. This suggests that training data, more than architecture, limits domain-general summarization.

Key points

  • Coverage: about 200K tokens in 213 documents and 12 genres, including interviews, news, Wikivoyage, WikiHow, Reddit, SBC conversations, YouTube vlogs and OpenStax textbooks.
  • Document and summary size: documents run from 167 to 1,878 tokens (mean 957). Summaries average about 50 words.
  • Underlying annotation: GUM supplies gold UD syntax, entity types, coreference and discourse parses for the same texts.
  • Guidelines: seven rules for summaries.
    • At most one sentence or 380 characters.
    • Substitutive rather than indicative.
    • States participants, time, place and manner.
    • A full sentence, not a fragment.
    • Leaves out distracting details.
    • Contains no outside information.
    • Uses no synonyms for the source's words.
  • Double references: the 24 test documents each have two summaries, which supports agreement studies and multi-reference scoring.
  • Results (BLEURT): SimCLS 31.9, BRIO 36.3, GPT3-DV2 42.2, BRIO-FT 44.3, second human 50.2.
    • Fine-tuning helped most on conversations, travel guides and how-to guides.
    • Humans varied less across genres. Their lowest scores, surprisingly, were on news.

Interesting ideas

  • I1. A strict "nothing outside the text" rule bans even plausible completions such as a film's full title or the platform name, so any added content counts as an error, not as helpful knowledge.
  • I2. Forcing summaries to reuse the source's words instead of synonyms makes faithfulness easier to check and keeps the original style.
  • I3. Requiring participants, time, place and manner defines summary quality as a checklist of slots, not a vague impression.
  • I4. A tiny, carefully constrained in-domain set (165 documents) beat a much larger general model, showing that data quality and genre coverage matter more than scale.
  • I5. A second human reference on the test split serves as a ceiling, and per-genre breakdowns reveal where systems fail despite good averages.

For Mova

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

  • I1 (back): Generation from the meaning graph could be checked so that every entity and event it outputs traces back to a node built from the source, flagging any addition.
  • I2 (back): The text → graph → text compressor could prefer the source's lemmas when realizing nodes, so its output can be compared token by token with the input.
  • I3 (world): A text's event timeline could expose these slots per event, and a compression or QA step could test whether the key event's who, when and where are filled.
  • I4 (learn): Silver or teacher data could be supplemented with a small, strictly vetted multi-genre gold slice, for example from GUM genres, aimed at weak domains like conversation and how-to.
  • I5 (learn): Mova's evaluations could report a human-agreement ceiling and per-genre scores, so gains on news-like text do not hide failures on spoken or forum genres.

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

 Institutions

 Fields, topics and concepts

Cite

Cite as Yang Janet Liu and Amir Zeldes. 2023. GUMSum: Multi-Genre Data and Evaluation for English Abstractive Summarization. Findings of the Association for Computational Linguistics: ACL 2023.

The paper itself, not this page. BibTeX from the library's record of the work. DOI 10.18653/v1/2023.findings-acl.593

@inproceedings{liu2023gumsum,
  title = {{GUMSum: Multi-Genre Data and Evaluation for English Abstractive Summarization}},
  author = {Yang Janet Liu and Amir Zeldes},
  booktitle = {Findings of the Association for Computational Linguistics: ACL 2023},
  year = {2023},
  doi = {10.18653/v1/2023.findings-acl.593},
  url = {https://doi.org/10.18653/v1/2023.findings-acl.593}
}

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