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PIQA: Reasoning about Physical Commonsense in Natural Language

Written for the Research library (claude-opus-5-5) from the paper text, in our own words: the license "arXiv — non-exclusive licence to distribute" does not allow redistributing the text itself. Original — arxiv.org/pdf/1911.11641v1

Summary

The paper asks whether language models trained only on text can handle everyday physical reasoning, such as choosing the right household object for a task. Such knowledge is rarely written down explicitly because of reporting bias. The authors frame this as a new task and release the PIQA benchmark (Physical Interaction: Question Answering). Each item pairs a goal with two candidate solutions, and exactly one of them is correct. Crowdworkers wrote the items using instructables.com guides as inspiration, which pushed them toward unusual uses of common objects. For each goal they also wrote a subtly broken "trick" solution. Low-agreement items were removed during validation, and the AFLite algorithm filtered out superficial artifacts. Humans solve the benchmark almost perfectly, while strong pretrained models such as RoBERTa lag far behind. Error analysis shows models confuse fine spatial relations and novel object combinations. The work matters because it exposes the limits of text-only learning about the world. It also offers a target for grounded language research relevant to robotics.

Key points

  • Human accuracy on PIQA is about 95%, while the best large pretrained models reach roughly 77%.
  • The data splits are just over 16,000 training pairs, about 2K development pairs and about 3K test pairs.
  • Goals average 7.8 tokens and solutions average 21.3 tokens, giving over 3.7 million training tokens.
  • Correct and trick solutions have nearly identical length distributions and share at least 85% of their vocabulary in each part of speech. The training data contains 6,881 unique nouns, 2,493 verbs, 2,263 adjectives and 604 adverbs.
  • The prompts were drawn from six instructables sections, namely food, home, workshop, craft, costume and outside. Annotators had to pass a qualification test with over 80% accuracy and were paid more than $15/hr on average.

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

Fields: AI & machine learning

Cited by

1183 papers of our library cite it (of the 140673 whose bibliographies we read); 69 of them have a page here, 1114 not yet.

Cite

The paper itself, not this page. BibTeX from the library's record of the work. DOI 10.48550/arxiv.1911.11641 · arXiv 1911.11641

@misc{bisk2019piqa,
  title = {{PIQA: Reasoning about Physical Commonsense in Natural Language}},
  author = {Bisk, Yonatan and Zellers, Rowan and Bras, Ronan Le and Gao, Jianfeng and Choi, Yejin},
  year = {2019},
  doi = {10.48550/arxiv.1911.11641},
  eprint = {1911.11641},
  archivePrefix = {arXiv},
  url = {https://doi.org/10.48550/arxiv.1911.11641}
}

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