非マルコフ操作のための階層的明示言語メモリ
HeLM: Hierarchical Explicit Language Memory for Non-Markovian Manipulation
人間の内言に着想を得て、タスク関連の履歴を明示的な言語で保持する階層型VLAフレームワークHeLMを提案し、非マルコフ環境での操作成功率を向上させた。
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著者: Gyeonghun Kim, Donghoon Kim, Minsoo Choi, Suyun Lee
分類: cs.RO
原文アブストラクト
Recent advances in Vision-Language-Action (VLA) models have enabled fine manipulation capabilities, yet performing tasks that require working memory remains a key challenge. Most existing VLA architectures operate under a Markovian assumption, mapping only the current observation to an action, which leads to failure in non-Markovian environments. Inspired by the human 'inner monologue', we propose Hierarchical Explicit Language Memory (HeLM), a hierarchical VLA framework that maintains task-relevant history in explicit language through factorized event detection and event-triggered memory updates. We evaluate HeLM across 10 non-Markovian real-world tasks with 56 variants, including five newly formulated inter-episode tasks that require persistent context across task boundaries. HeLM improves intra-episode success by 12.8 percentage points over the strongest baseline and achieves 78% subtask success on compositional generalization tasks, while using up to 4.5x less memory and running 2.5x faster than the keyframe baseline at long horizons.