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WorldSense: A Synthetic Benchmark for Grounded Reasoning in Large Language Models

Paper · 2023 · Youssef Benchekroun, Megi Dervishi, Mark Ibrahim et al.

Summary

LLMs often seem to understand the physical world, but it is hard to tell whether they build coherent internal scene representations. Existing benchmarks suffer from bias and contamination, and they mix world knowledge with reasoning. WorldSense is a synthetic benchmark that probes such tacit world models through transitive inference over entities arranged in a linear order. It has three task families: grounded inference, consistency detection (is the described scene impossible?) and completeness detection (does the description leave the answer undetermined?). Each family has a trivial control. Problems are generated from abstract schemata and rendered with interchangeable lexical "skins." This keeps answers balanced and independent of wording. When GPT3.5, GPT4 and Llama2-chat were tested, all made errors even with three entities. They did especially poorly when the order had to be reconstructed from a description, and they rarely recognised contradictory or underspecified inputs. They also showed strong preferences for particular answers. Chain-of-thought prompting and in-context examples helped only marginally. Finetuning Llama2 improved results but did not extend beyond linear-order problems. The benchmark therefore offers a cleaner, contamination-resistant way to measure grounded reasoning.

Key points

  • Worlds contain up to five entities in a total order. Skins cover three domains (spatial, temporal, scalar) with six skins each, using two opposite binary relations and one ternary "in-between" relation.
  • Evaluated models were GPT3.5, GPT4 and Llama2-chat. GPT4 did fairly well when the order was given directly, but every model degraded sharply when it had to build the world state from text.
  • All models showed heavy response biases. Chain-of-thought prompting and in-context learning reduced errors only slightly and inconsistently.
  • Llama2 70B was finetuned on 100K and 1M examples. It generalised to new entities, relations, domains and larger problem sizes, with little sign of memorisation, and consistency problems were the hardest to learn.
  • Finetuning brought no gains on non-linear relations (e.g., parallel/perpendicular lines) or on external reasoning benchmarks. Data, the finetuning set and test splits are released at github.com/facebookresearch/worldsense.

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

Also on the byline: Lamsade.

 Fields, topics and concepts

Cite

Cite as Youssef Benchekroun, Megi Dervishi, Mark Ibrahim, Jean-Baptiste Gaya, Xavier Martinet, Gregoire Mialon, Thomas Scialom, Emmanuel Dupoux, Dieuwke Hupkes and Pascal Vincent. 2023. WorldSense: A Synthetic Benchmark for Grounded Reasoning in Large Language Models. arXiv:2311.15930.

The paper itself, not this page. BibTeX from the library's record of the work. DOI 10.48550/arxiv.2311.15930 · arXiv 2311.15930

@misc{benchekroun2023worldsense,
  title = {{WorldSense: A Synthetic Benchmark for Grounded Reasoning in Large Language Models}},
  author = {Youssef Benchekroun, Megi Dervishi, Mark Ibrahim, Jean-Baptiste Gaya, Xavier Martinet, Gregoire Mialon, Thomas Scialom, Emmanuel Dupoux, Dieuwke Hupkes and Pascal Vincent},
  year = {2023},
  doi = {10.48550/arxiv.2311.15930},
  eprint = {2311.15930},
  archivePrefix = {arXiv},
  url = {https://doi.org/10.48550/arxiv.2311.15930}
}

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