Model selection for incremental learning of generalizable movement primitives

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Journal ISSN
Volume Title
Conference article in proceedings
Date
2017-08-30
Major/Subject
Mcode
Degree programme
Language
en
Pages
8
359-366
Series
Proceedings of the 2017 18th International Conference on Advanced Robotics, ICAR 2017
Abstract
Although motor primitives (MPs) have been studied extensively, much less attention has been devoted to studying their generalization to new situations. To cope with varying conditions, a MP's policy encoding must support generalization over task parameters to avoid learning separate primitives for each condition. Local and linear parameterized models have been proposed to interpolate over task parameters to provide limited generalization. In this paper, we present a global parametric motion primitive which allows generalization beyond local or linear models. Primitives are modelled using a linear basis function model with global non-linear basis functions. Using the global parametric model, we developed an online incremental learning framework for constructing a database of MPs from a single human demonstration. Above all, we propose a model selection method that can choose an optimal model complexity even with few training samples, which makes it suitable for online incremental learning. Experiments with a ball-in-a-cup task with varying string lengths demonstrate that the global parametric approach can successfully extract underlying regularities in a database of MPs leading to enhanced generalization capability of the parametric MPs and increased speed (convergence rate) of learning. Furthermore, it significantly excels over locally weighted regression both in terms of inter- and extrapolation.
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Keywords
Generalizable parametric movement primitives, Incremental learning, Learning from demonstration, Model selection
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Citation
Hazara , M & Kyrki , V 2017 , Model selection for incremental learning of generalizable movement primitives . in Proceedings of the 2017 18th International Conference on Advanced Robotics, ICAR 2017 . , 8023633 , IEEE , pp. 359-366 , International Conference on Advanced Robotics , Hong Kong , China , 10/07/2017 . https://doi.org/10.1109/ICAR.2017.8023633