---
title: "Detection and Measurement of Syntactic Templates in Generated"
description: "Most evaluations of diversity in LLM output look at words, such as repeated n-grams. 49 references, cited by 26 papers here."
authors: ["Chantal Shaib", "Yanai Elazar", "Junyi Jessy Li", "Byron C Wallace"]
year: 2024
venue: "Proceedings of the 2024 Conference on Empirical Methods in Natural Language Processing"
source: "https://aclanthology.org/2024.emnlp-main.368/"
doi: "10.18653/v1/2024.emnlp-main.368"
licence: "CC BY 4.0 (ACL Anthology)"
licence_url: "https://creativecommons.org/licenses/by/4.0/"
summary_licence: "Elamur Cosmic License"
canonical: "https://research.elamur.ai/free/en/papers/shaib-2024-detection-measurement-syntactic-templates-generated/"
---
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# Detection and Measurement of Syntactic Templates in Generated Text

**Authors:** [Chantal Shaib](https://md.research.elamur.ai/free/en/authors/chantal-shaib/), [Yanai Elazar](https://md.research.elamur.ai/free/en/authors/yanai-elazar/), [Junyi Jessy Li](https://md.research.elamur.ai/free/en/authors/junyi-jessy-li/) and [Byron C Wallace](https://md.research.elamur.ai/free/en/authors/byron-c-wallace/) · **Year:** 2024 · **Venue:** [Proceedings of the 2024 Conference on Empirical Methods in Natural Language Processing](https://md.research.elamur.ai/free/en/venues/emnlp/) ([EMNLP 2024](https://md.research.elamur.ai/free/en/venues/emnlp/2024/)) · **Publisher:** [Association for Computational Linguistics](https://md.research.elamur.ai/free/en/publishers/association-for-computational-linguistics/) · **Licence:** [CC BY 4.0 (ACL Anthology)](https://creativecommons.org/licenses/by/4.0/)

**Links:** [Publisher's page](https://aclanthology.org/2024.emnlp-main.368/) · [PDF](https://aclanthology.org/2024.emnlp-main.368.pdf) · [DOI 10.18653/v1/2024.emnlp-main.368](https://doi.org/10.18653/v1/2024.emnlp-main.368) · [OpenAlex](https://openalex.org/W4404783440)

**Citations:** 6 citations (OpenAlex, 2026-10-14) · [26](https://md.research.elamur.ai/free/en/papers/shaib-2024-detection-measurement-syntactic-templates-generated/cited-by/) in our library, of the 149,439 papers whose bibliographies we read

## Summary
Most evaluations of diversity in LLM output look at words, such as repeated n-grams. They miss repetition at the level of sentence structure. Shaib et al. treat sequences of part-of-speech tags as "syntactic templates." They use these templates to study how formulaic instruction-tuned models are and where that formulaic structure originates.

Templates are extracted with the authors' `diversity` package, which tags text using the SpaCy tagger (Penn Treebank tagset) and keeps the most frequent POS n-grams. Three metrics quantify them: a POS-level compression ratio, the share of texts containing a template, and template density per token. The authors apply these to eight models on three tasks, mostly summarization. They compare the results with human references and with pre-training corpora such as Dolma.

Generated text turns out to be more templated than human writing. Most of its templates already occur in pre-training data, and fine-tuning or RLHF does not remove them. Template matching also exposes a softer kind of memorization than exact-string matching can detect.

The work matters because it gives a structural lens for model style and diversity, and a way to probe training data that is not public.

## Key points
- About 76% of templates in model outputs also appear in pre-training data, compared with roughly 35% for human-written text.
- Templates are POS n-grams of length 4–8. In one OLMo-7B example of movie meta-reviews on Rotten Tomatoes, 33 of 35 repeated POS sequences were found in Dolma, even though the text itself was novel.
- The three metrics are CR-POS (a gzip compression ratio over POS sequences), template rate, and templates-per-token. Bigger Llama-2/Llama-3 models were not less templated than smaller ones.
- The memorization test prompted OLMo-7B with 50-token prefixes taken from frequent Dolma 100-grams, using greedy decoding. POS-based "style" matching flagged about 6.4% of samples as memorized, versus about 5.3% for exact-text matching. The extra cases typically involved swapped synonyms or numbers.
- The analysis covers English only and requires a large corpus of outputs from each model. Code is available via the `diversity` PyPI package.

*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

- [University of Washington](https://md.research.elamur.ai/free/en/universities/university-of-washington/) — University, Seattle, United States · 353 works · 200,043 citations
- [Allen Institute for Artificial Intelligence](https://md.research.elamur.ai/free/en/labs/allen-institute-for-artificial-intelligence/) — Research institute, Seattle, United States · 275 works · 97,634 citations
- [The University of Texas at Austin](https://md.research.elamur.ai/free/en/universities/the-university-of-texas-at-austin/) — University, Austin, United States · 109 works · 56,942 citations
- [Northeastern University](https://md.research.elamur.ai/free/en/universities/northeastern-university/) — University, Boston, United States · 57 works · 6,533 citations

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## Cite

Cite as: Chantal Shaib, Yanai Elazar, Junyi Jessy Li and Byron C Wallace. 2024. Detection and Measurement of Syntactic Templates in Generated Text. Proceedings of the 2024 Conference on Empirical Methods in Natural Language Processing.

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

```bibtex
@inproceedings{shaib2024detection,
  title = {{Detection and Measurement of Syntactic Templates in Generated Text}},
  author = {Chantal Shaib, Yanai Elazar, Junyi Jessy Li and Byron C Wallace},
  booktitle = {Proceedings of the 2024 Conference on Empirical Methods in Natural Language Processing},
  year = {2024},
  doi = {10.18653/v1/2024.emnlp-main.368},
  url = {https://doi.org/10.18653/v1/2024.emnlp-main.368}
}
```

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49. Template (Constituents) Frequency Matched Text (VP (VB ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP) (PP (IN ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP) (DT ) (JJ ) (NN )) (PP (IN ) (NP) [find](https://scholar.google.com/scholar?q=Template+%28Constituents%29+Frequency+Matched+Text+%28VP+%28VB+%29+%28NP+%28NP+%28DT+%29+%28JJ+%29+%28NN+%29%29+%28PP+%28IN+%29+%28NP%29+%28PP+%28IN+%29+%28NP+%28NP+%28DT+%29+%28JJ+%29+%28NN+%29%29+%28PP+%28IN+%29+%28NP%29+%28DT+%29+%28JJ+%29+%28NN+%29%29+%28PP+%28IN+%29+%28NP%29)

*Updated 1 November 2026*