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Tailoring Self-Rationalizers with Multi-Reward Distillation

Paper · 2023 · Sahana Ramnath, Brihi Joshi, Skyler Hallinan et al.

Summary

Free-text rationales from language models are usually judged only by whether they raise answer accuracy, and good self-rationalization has been thought to require very large models such as 175B GPT-3. This work asks whether a model under 1B parameters can produce rationales that are both helpful for the task and good in their own right. The proposed method, MaRio (Multi-rewArd RatIOnalization), first trains a small LM such as T5-large on rationales written by GPT-3 (text-davinci-003). It then extends the QUARK framework to optimize several rewards at once. Generations are sorted into bins by reward score, and the model learns to condition on control tokens for each property. At inference time it is prompted with the highest-reward tokens. The targeted properties are plausibility, diversity (no repetition) and consistency with the gold answer, with task accuracy optionally added as a reward. On five QA benchmarks, MaRio beats a supervised fine-tuning baseline on both accuracy and rationale quality, and human judges prefer its explanations. This suggests that cheap, small rationalizers are practical.

Key points

  • The setup uses the I-RO format: the model reads a question and outputs a rationale followed by the answer.
  • The method is evaluated on StrategyQA, QuaRel, OpenBookQA, NumerSense and QASC. These were chosen because they require implicit or logical reasoning.
  • MaRio has two variants for combining rewards in QUARK, called Classic and Additive. Adding task accuracy as an extra reward gave the best configuration.
  • The small models are about 200 times smaller than GPT-3, yet they surpass the SFT baseline in plausibility, consistency, diversity and accuracy.
  • Amazon MTurk pairwise evaluations confirm the human preference for MaRio rationales. The authors note that properties such as factuality and completeness still lack reliable automatic rewards. Project page: inklab.usc.edu/MaRio/.

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

 Fields, topics and concepts

Cite

Cite as Sahana Ramnath, Brihi Joshi, Skyler Hallinan, Ximing Lu, Liunian Harold Li, Aaron Chan, Jack Hessel, Yejin Choi and Xiang Ren. 2023. Tailoring Self-Rationalizers with Multi-Reward Distillation. arXiv:2311.02805 · The Twelfth International Conference on Learning Representations, 2024.

The paper itself, not this page. BibTeX from the library's record of the work. DOI 10.48550/arxiv.2311.02805 · arXiv 2311.02805

@misc{ramnath2023tailoring,
  title = {{Tailoring Self-Rationalizers with Multi-Reward Distillation}},
  author = {Sahana Ramnath, Brihi Joshi, Skyler Hallinan, Ximing Lu, Liunian Harold Li, Aaron Chan, Jack Hessel, Yejin Choi and Xiang Ren},
  year = {2023},
  doi = {10.48550/arxiv.2311.02805},
  eprint = {2311.02805},
  archivePrefix = {arXiv},
  url = {https://doi.org/10.48550/arxiv.2311.02805}
}

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