X-Fly: 全チャンク空中視覚言語ナビゲーションにおける到達と停止の学習
X-Fly: Learning to Reach and Stop in Full-Chunk Aerial Vision-Language Navigation
空中VLNで予測行動チャンクをまとめて実行する際の停止失敗を解決するため、Recovery DAggerとFlow-GRPOによる段階的学習法を提案し、成功率を大幅に向上させた。
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著者: Ruibin Ju, Ruifeng Cai, Min Xu, Lin Wang
分類: cs.RO, cs.AI, cs.CV
原文アブストラクト
Aerial vision-language navigation (VLN) agents built on large vision-language models are expensive to query. Executing a complete predicted action chunk before replanning amortizes this cost, reducing model inference from 195 to 42 ms per executed waypoint for our policy. It also moves the states at which the policy is queried away from expert demonstrations, which supervise neither recovery from these states nor termination at the learner's own arrival. On OpenFly test-seen, no-stop failures account for 47.78% of full-chunk behavior cloning (BC) outcomes. We present X-Fly, a staged training framework for full-chunk aerial VLN. Recovery DAgger labels learner-visited decision states with smooth chunks that reconnect to future expert segments and with STOP at the first in-region state. Flow-GRPO then jointly refines the chunked flow controller and a Bernoulli STOP policy from same-task closed-loop outcomes, supplemented by outcome-verified stopping supervision. With eight controls per decision, X-Fly reaches 74.18% SR on test-seen and 51.73% on test-unseen, compared with 16.45% and 18.43% for full-chunk BC and 32.04% and 29.46% for DreamFly.