強化学習ベース適応制御のための実行時増分トランスフォーマー
Runtime-Incremental Transformer for Reinforcement-Learning-Based Adaptive Control
強化学習中にアテンションヘッドを動的に増減させる機構を提案し、摩擦メモリを持つマニピュレータの適応制御で長期的な失敗を解消した。
詳しい要約
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著者: Giansalvo Cirrincione, Adriano Fagiolini
分類: cs.RO, cs.LG
原文アブストラクト
Learning-based adaptive control of robotic manipulators with non-observable friction memory has been addressed by attention- based meta-controllers whose number of attention heads is fixed before training and is tuned by costly offline search. At long memory horizons, such fixed-capacity controllers are prone to catastrophic failures on a sizeable fraction of training seeds. The present paper introduces a runtime mechanism that grows and prunes the heads of the attention block during reinforcement learning, governed by two signals: the effective rank of the on-policy context distribution, which triggers growth when representational capacity becomes insufficient, and the per-head output magnitude, which flags redundant heads for removal. Policy continuity at growth events and a quantitative bound at prune events are established analytically. On a two- link manipulator with Stribeck friction, the proposed mechanism attains full success across all memory regimes, eliminating the long-horizon failure mode and removing the need for offline tuning of the head count.