A dual-branch text-imagination system, with one LLM branch for state estimation and one for candidate-direction description, improves R2R navigation success over prior LLM-based VLN methods.
On the Evaluation of Vision-and-Language Navigation Instructions
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abstract
Vision-and-Language Navigation wayfinding agents can be enhanced by exploiting automatically generated navigation instructions. However, existing instruction generators have not been comprehensively evaluated, and the automatic evaluation metrics used to develop them have not been validated. Using human wayfinders, we show that these generators perform on par with or only slightly better than a template-based generator and far worse than human instructors. Furthermore, we discover that BLEU, ROUGE, METEOR and CIDEr are ineffective for evaluating grounded navigation instructions. To improve instruction evaluation, we propose an instruction-trajectory compatibility model that operates without reference instructions. Our model shows the highest correlation with human wayfinding outcomes when scoring individual instructions. For ranking instruction generation systems, if reference instructions are available we recommend using SPICE.
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Cross from Left to Right Brain: Adaptive Text Dreamer for Vision-and-Language Navigation
A dual-branch text-imagination system, with one LLM branch for state estimation and one for candidate-direction description, improves R2R navigation success over prior LLM-based VLN methods.