NavHint: Vision and Language Navigation Agent with a Hint Generator
<|reference_start|>NavHint: Vision and Language Navigation Agent with a Hint Generator: Existing work on vision and language navigation mainly relies on navigation-related losses to establish the connection between vision and language modalities, neglecting aspects of helping the navigation agent build a deep understanding of the visual environment. In our work, we provide indirect supervision to the navigation agent through a hint generator that provides detailed visual descriptions. The hint generator assists the navigation agent in developing a global understanding of the visual environment. It directs the agent's attention toward related navigation details, including the relevant sub-instruction, potential challenges in recognition and ambiguities in grounding, and the targeted viewpoint description. To train the hint generator, we construct a synthetic dataset based on landmarks in the instructions and visible and distinctive objects in the visual environment. We evaluate our method on the R2R and R4R datasets and achieve state-of-the-art on several metrics. The experimental results demonstrate that generating hints not only enhances the navigation performance but also helps improve the interpretability of the agent's actions.<|reference_end|>
@article{zhang2024navhint:,
    title={NavHint: Vision and Language Navigation Agent with a Hint Generator},
    author={Yue Zhang, Quan Guo, Parisa Kordjamshidi},
    journal={arXiv preprint arXiv:2402.02559},
    year={2024},
    archivePrefix={arXiv},
    eprint={2402.02559},
    primaryClass={cs.CL}
}