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Are Large Language Model-based Evaluators the Solution to Scaling Up Multilingual Evaluation?

Paper · 2023 · Rishav Hada, Varun Gumma, Adrian de Wynter et al.

Summary

Scaling LLM evaluation beyond English is difficult. Benchmarks cover few languages and few realistic tasks, automatic metrics handle rich morphology and unusual scripts poorly, and native-speaker judges are costly and slow. The authors test whether GPT-4, scoring outputs without reference texts, can replace or supplement human raters. They use outputs from a GPT-4-powered text generation product on three tasks (Open Prompt, Continue Writing, Summarize). The outputs come from high-resource languages ranging from English to Czech. The authors compare GPT-4's scores with roughly 20K native-speaker judgments across five quality dimensions and try several prompting setups. Raw agreement with humans looks high. However, GPT-4 consistently gives generous scores, especially when human raters disagree with each other. This gap is larger for non-Latin-script languages (Chinese, Japanese) and for the less-resourced Czech. The study warns against trusting LLM judges uncritically in multilingual settings. It recommends calibrating them against human labels in each language before use.

Key points

  • The five metrics are Linguistic Acceptability (LA), Output Content Quality (OCQ) and Task Quality (TQ), each scored 0–2, plus Problematic Content (PC) and Hallucinations (H), both binary.
  • The abstract says eight languages, but the setup lists nine: En, Fr, De, Es, Zh, Ja, It, Pt-Br and Cs. Following Joshi et al. (2020), most are Class 5, and It, Pt-Br and Cs are Class 4.
  • Each item received three annotations from contracted native speakers, paid about $14–30 USD/hr depending on locale.
  • Scoring one metric per GPT-4 call worked better than scoring all metrics at once. Few-shot examples gave no improvement, and more detailed instructions did not remove the upward score bias.
  • The human-annotated dataset is in-house and unreleased, which limits reproducibility. Code is available at aka.ms/LLM-Eval.

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

Cite

Cite as Rishav Hada, Varun Gumma, Adrian de Wynter, Harshita Diddee, Mohamed Ahmed, Monojit Choudhury, Kalika Bali and Sunayana Sitaram. 2023. Are Large Language Model-based Evaluators the Solution to Scaling Up Multilingual Evaluation?. arXiv:2309.07462.

The paper itself, not this page. BibTeX from the library's record of the work. DOI 10.48550/arxiv.2309.07462 · arXiv 2309.07462

@misc{hada2023are,
  title = {{Are Large Language Model-based Evaluators the Solution to Scaling Up Multilingual Evaluation?}},
  author = {Rishav Hada, Varun Gumma, Adrian {de Wynter}, Harshita Diddee, Mohamed Ahmed, Monojit Choudhury, Kalika Bali and Sunayana Sitaram},
  year = {2023},
  doi = {10.48550/arxiv.2309.07462},
  eprint = {2309.07462},
  archivePrefix = {arXiv},
  url = {https://doi.org/10.48550/arxiv.2309.07462}
}

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