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When Engineering Outruns Intelligence: Rethinking Instruction-Guided Navigation

Created by
  • Haebom

Author

Matin Aghaei, Lingfeng Zhang, Mohammad Ali Alomrani, Mahdi Biparva, Yingxue Zhang

Outline

This paper reassesses the contribution of large-scale language models (LLMs) to the recent zero-shot performance improvements achieved in the ObjectNav system, separating the contributions of linguistic and geometric information. To achieve this, we re-evaluate the InstructNav pipeline in a detector-controlled environment and introduce two training-free variants that only modify the action-value map: the Frontier Proximity Explorer (FPE), which uses only geometric information, and the Lightweight Semantic-Heuristic Frontier (SHF), which uses LLMs via simple frontier voting.

Takeaways, Limitations

Takeaways:
A significant portion of the reported progress is due to the elaborately designed frontier geometry.
Language is more reliable as a lightweight heuristic than as an end-to-end planner.
FPE performs as well or better than detector control command followers, while running faster without API calls.
SHF achieves similar accuracy using a smaller, more localized language prior.
Limitations:
There is no specific mention of Limitations in the paper (not something that can be gleaned from the abstract of the paper).
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