オンライン有界合理性人間行動推定を用いた適応的共有制御
Adaptive Shared Control with Online Bounded-Rational Human Behavior Estimation
人間の完全合理性を仮定せず、レベルk有界合理性モデルと適応動的計画法で候補方策を構築し、状態遷移残差から人間行動分布をオンライン推定してロボットが期待コスト最小の応答を計算する共有制御手法を提案した。
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著者: Henry Ascencio Trejo, Roel Pieters, Gokhan Alcan
分類: cs.RO, eess.SY
原文アブストラクト
This work considers adaptive shared human-robot control for nonlinear control-affine systems, where the assumption of a fully rational human is relaxed and the robot adapts its assistance to observed boundedly rational human behavior. We use a level-k bounded-rationality model of the two-player game to construct a finite bank of candidate human and robot policies through alternating best-response computations, with the associated value functions and policies approximated using adaptive dynamic programming. During the shared-control interaction, state-transition residuals compare the measured system evolution with the trajectories predicted by the candidate human policies. The residuals are accumulated using a forgetting factor and mapped to a probabilistic human-behavior model over the finite candidate bank. Rather than selecting a single candidate or averaging stored robot policies, the robot computes a distribution-aware one-step best response by minimizing an expected cooperative cost over the complete estimated human behavior distribution. For a quadratic terminal-value approximation and Euler state propagation, this response admits a closed-form solution expressed in terms of the expected human input. The proposed methods are evaluated in simulations of a benchmark nonlinear system stabilization task, and of a planar manipulator shared control setup. The reported results show decreasing Kullback-Leibler divergence between the estimated and simulated human behavior distributions, and a lower accumulated running cost for the robot agent over the shared control interaction period, than the maximum-probability and probability-weighted alternative policies baseline.