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Ground-Truth Labels Matter: A Deeper Look into Input-Label Demonstrations

Paper · 2022 · Kang Min Yoo, Junyeob Kim, Hyuhng Joon Kim et al.

Summary

This paper revisits the claim by Min et al. (2022b) that in-context learning (ICL) barely depends on whether demonstration labels are correct. The authors argue that this conclusion came from macro-averaging results over a few datasets and from one particular experimental setup. They show that small but reasonable changes, such as using the Direct method instead of Noisy Channel, accuracy instead of macro-F1, or all 17 datasets instead of five, make label corruption hurt much more.

To replace subjective judgement with measurement, they propose two metrics:

  • Label-Correctness Sensitivity, which uses linear regression to estimate how much performance shifts per fixed amount of label corruption.
  • Ground-truth Label Effect Ratio (GLER), which expresses the effect of ground-truth labels as a ratio.

Experiments with GPT-J, GPT-NeoX and GPT-3 show that correct input-label mappings often matter considerably, though the size of the effect varies by setting. Prompt template verbosity and model size emerge as factors that control robustness to noisy labels. This matters for low-resource uses of ICL, such as building demonstrations from noisy synthetic examples.

Key points

  • On hate_speech18 with GPT-J, accuracy with ground-truth demonstrations exceeded accuracy with fully incorrect labels by up to 80%. Similar large gaps appeared for GPT-3 on SST2 and TREC.
  • The prior setup (Noisy Channel, macro-F1, 5 datasets) masks label sensitivity. The Direct method with accuracy over all 17 datasets makes it clearly visible.
  • In "label prior-free" tests on 8 classification datasets, labels were swapped for unrelated alphabet, numeric or random tokens while keeping the mappings. Models still exploited the input-label pairs.
  • With label-balanced demonstrations on imbalanced datasets (e.g., hate_speech18, ethos subsets), average sensitivity stayed notable: 0.189 for GPT-NeoX and 0.308 for GPT-J.
  • Stated limitations include no per-dataset prompt engineering and an underperforming Huggingface version of GPT-NeoX.

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 Kang Min Yoo, Junyeob Kim, Hyuhng Joon Kim, Hyunsoo Cho, Hwiyeol Jo, Sang-Woo Lee, Sang-goo Lee and Taeuk Kim. 2022. Ground-Truth Labels Matter: A Deeper Look into Input-Label Demonstrations. Proceedings of the 2022 Conference on Empirical Methods in Natural Language Processing.

The paper itself, not this page. BibTeX from the library's record of the work. DOI 10.18653/v1/2022.emnlp-main.155

@inproceedings{yoo2022ground,
  title = {{Ground-Truth Labels Matter: A Deeper Look into Input-Label Demonstrations}},
  author = {Kang Min Yoo, Junyeob Kim, Hyuhng Joon Kim, Hyunsoo Cho, Hwiyeol Jo, Sang-Woo Lee, Sang-goo Lee and Taeuk Kim},
  booktitle = {Proceedings of the 2022 Conference on Empirical Methods in Natural Language Processing},
  year = {2022},
  doi = {10.18653/v1/2022.emnlp-main.155},
  url = {https://doi.org/10.18653/v1/2022.emnlp-main.155}
}

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