Little inquiry has explicitly addressed the role of action spaces in language-guided visual navigation -- either in terms of its effect on navigation success or the efficiency with which a robotic agent could execute the resulting trajectory. Building on the recently released VLN-CE setting for instruction following in continuous environments, we develop a class of language-conditioned waypoint prediction networks to examine this question. We vary the expressivity of these models to explore a spectrum between low-level actions and continuous waypoint prediction. We measure task performance and estimated execution time on a profiled LoCoBot robot. We find more expressive models result in simpler, faster to execute trajectories, but lower-level actions can achieve better navigation metrics by approximating shortest paths better. Further, our models outperform prior work in VLN-CE and set a new state-of-the-art on the public leaderboard -- increasing success rate by 4% with our best model on this challenging task.

使用语言指导下的路径规划，研究机器人领域中的导航方式和交互问题。通过变换不同的机器学习模型，来探索不同的路径预测方法，并发现在navigation metrics上，更具表现力的模型能够帮助机器人找到更优秀、更简单、更快速的路径，而低层动作则能够通过近似最短路径来获取更好的路径规划结果。

连续环境下基于指令导航的航点模型