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home / papers / 2023 / DQ-LoRe: Dual Queries with Low Rank Approximation Re-ranking for In-Context Learning

DQ-LoRe: Dual Queries with Low Rank Approximation Re-ranking for In-Context Learning

Paper · 2023 · Jing Xiong, Zixuan Li, Chuanyang Zheng et al.

Summary

The order and choice of demonstrations in a prompt strongly affect how well large language models solve multi-step reasoning problems. Existing retrieval-based selectors mostly match exemplars by how similar the question text is. The authors argue that this ignores the reasoning itself. They also argue that high-dimensional sentence embeddings carry redundant, anisotropic information, which makes candidate exemplars hard to tell apart.

Their framework, DQ-LoRe, works with two queries:

  • First query: the LLM is prompted, starting from Complex-CoT exemplars, to write a chain-of-thought for the test question.
  • Second query: the question and this generated CoT together are used to search a retriever over the training pool.

The retrieved candidates are then re-ranked after PCA projects their embeddings into a lower-rank space. The retriever is trained contrastively, with positive and negative sets built from CoT similarity using BM25 and LLM feedback.

With GPT-4, DQ-LoRe lifts accuracy from 92.5%, the prior best automatic selection result, to 94.2%. It is particularly robust under distribution shift. This suggests that reasoning-aware, low-rank retrieval can find better prompts without hand-crafted exemplars.

Key points

  • Pipeline: the LLM generates a CoT, then question plus CoT query the retriever, then PCA-based low-rank re-ranking (LoRe) picks the final exemplars.
  • Complex-CoT supplies the initial n-shot prompt. BM25 and LLM signals build the positive/negative training sets for the retriever.
  • On GPT-4, accuracy improves from 92.5% to 94.2% compared with earlier state-of-the-art exemplar selection. Gains are strongest in distribution-shift settings.
  • A case study contrasts the methods:
    • EPR picks exemplars with matching surface words (all "Mary baking a cake").
    • CEIL favours diverse but unrelated problems.
    • DQ-LoRe finds exemplars with the same reasoning pattern (subtraction then comparison), even when the context differs.
  • Code is released at github.com/menik1126/DQ-LoRe (arXiv:2310.02954).

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

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Cite

Cite as Jing Xiong, Zixuan Li, Chuanyang Zheng, Zhijiang Guo, Yichun Yin, Enze Xie, Zhicheng Yang, Qingxing Cao, Haiming Wang, Xiongwei Han, Jing Tang, Chengming Li and Xiaodan Liang. 2023. DQ-LoRe: Dual Queries with Low Rank Approximation Re-ranking for In-Context Learning. arXiv:2310.02954.

The paper itself, not this page. BibTeX from the library's record of the work. DOI 10.48550/arxiv.2310.02954 · arXiv 2310.02954

@misc{xiong2023dq,
  title = {{DQ-LoRe: Dual Queries with Low Rank Approximation Re-ranking for In-Context Learning}},
  author = {Jing Xiong, Zixuan Li, Chuanyang Zheng, Zhijiang Guo, Yichun Yin, Enze Xie, Zhicheng Yang, Qingxing Cao, Haiming Wang, Xiongwei Han, Jing Tang, Chengming Li and Xiaodan Liang},
  year = {2023},
  doi = {10.48550/arxiv.2310.02954},
  eprint = {2310.02954},
  archivePrefix = {arXiv},
  url = {https://doi.org/10.48550/arxiv.2310.02954}
}

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