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  4. Learning Stable Task Sequences from Demonstration with Linear Parameter Varying Systems and Hidden Markov Models
 
conference paper

Learning Stable Task Sequences from Demonstration with Linear Parameter Varying Systems and Hidden Markov Models

Medina, Jose R.
•
Billard, Aude  orcid-logo
2017
Proceedings of the 1st Annual Conference on Robot Learning
robot-learning

The problem of acquiring multiple tasks from demonstration is typi- cally divided in two sequential processes: (1) the segmentation or identification of different subgoals/subtasks and (2) a separate learning process that parameterizes a control policy for each subtask. As a result, segmentation criteria typically neglect the characteristics of control policies and rely instead on simplified models. This paper aims for a single model capable of learning sequences of complex time-independent control policies that provide robust and stable behavior. To this end, we first present a novel and efficient approach to learn goal-oriented time independent motion models by estimating both attractor and dynamic behavior from data guaranteeing stability using linear parameter varying (LPV) systems. This method enables learning complex task sequences with hidden Markov models (HMMs), where each state/subtask is given by a stable LPV system and where transitions are most likely around the corresponding attractor. We study the dynamics of the HMM-LPV model and propose a motion generation method that guarantees the stability of task sequences. We validate our approach in two sets of demonstrated human motions

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Type
conference paper
Author(s)
Medina, Jose R.
Billard, Aude  orcid-logo
Date Issued

2017

Publisher

robot-learning

Published in
Proceedings of the 1st Annual Conference on Robot Learning
Series title/Series vol.

Proceedings of Machine Learning Research; 78

Start page

175

End page

184

Subjects

Dynamical systems

•

Stability

•

Linear Parameter Varying Systems

URL

URL

http://www.robot-learning.org/accepted-papers
Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LASA  
Event nameEvent placeEvent date
robot-learning

Mountain View, California

November 13 - 15, 2017

Available on Infoscience
September 13, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/140639
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