Control-oriented meta-learning
This work addresses the challenge of specifying nonlinear features for adaptive control in robotics, offering a control-oriented meta-learning approach that improves tracking performance in complex scenarios like aerodynamic disturbances.
The paper tackled the problem of real-time adaptation for robot control in dynamic environments by developing an adaptive controller with data-driven modeling of nonlinear features, demonstrating that it outperforms regression-oriented meta-learning controllers in trajectory tracking for rotorcraft under wind disturbances.
Real-time adaptation is imperative to the control of robots operating in complex, dynamic environments. Adaptive control laws can endow even nonlinear systems with good trajectory tracking performance, provided that any uncertain dynamics terms are linearly parameterizable with known nonlinear features. However, it is often difficult to specify such features a priori, such as for aerodynamic disturbances on rotorcraft or interaction forces between a manipulator arm and various objects. In this paper, we turn to data-driven modeling with neural networks to learn, offline from past data, an adaptive controller with an internal parametric model of these nonlinear features. Our key insight is that we can better prepare the controller for deployment with control-oriented meta-learning of features in closed-loop simulation, rather than regression-oriented meta-learning of features to fit input-output data. Specifically, we meta-learn the adaptive controller with closed-loop tracking simulation as the base-learner and the average tracking error as the meta-objective. With both fully-actuated and underactuated nonlinear planar rotorcraft subject to wind, we demonstrate that our adaptive controller outperforms other controllers trained with regression-oriented meta-learning when deployed in closed-loop for trajectory tracking control.