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Self-reproduction for articulated behaviors with dual humanoid robots using on-line decision tree classification

Published online by Cambridge University Press:  24 June 2011

Jane Brooks Zurn
Affiliation:
School of Engineering, Virginia Commonwealth University, Richmond, VA 23284, USA. E-mail: brooks@med-associates.com
Yuichi Motai*
Affiliation:
School of Engineering, Virginia Commonwealth University, Richmond, VA 23284, USA. E-mail: brooks@med-associates.comMed Associates, Inc. P.O. Box 319, St. Albans, VT 05478, USA.
Scott Vento
Affiliation:
Chelsio Communications Inc. Sunnyvale, CA, USA. E-mail: svento@gmail.com
*
*Corresponding author. E-mail: ymotai@vcu.edu
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We have proposed a new repetition framework for vision-based behavior imitation by a sequence of multiple humanoid robots, introducing an on-line method for delimiting a time-varying context. This novel approach investigates the ability of a robot “student” to observe and imitate a behavior from a “teacher” robot; the student later changes roles to become the “teacher” for a naïve robot. For the many robots that already use video acquisition systems for their real-world tasks, this method eliminates the need for additional communication capabilities and complicated interfaces. This can reduce human intervention requirements and thus enhance the robots' practical usefulness outside the laboratory. Articulated motions are modeled in a three-layer method and registered as learned behaviors using color-based landmarks. Behaviors were identified on-line after each iteration by inducing a decision tree from the visually acquired data. Error accumulated over time, creating a context drift for behavior identification. In addition, identification and transmission of behaviors can occur between robots with differing, dynamically changing configurations. ITI, an on-line decision tree inducer in the C4.5 family, performed well for data that were similar in time and configuration to the training data but the greedily chosen attributes were not optimized for resistance to accumulating error or configuration changes. Our novel algorithm, OLDEX identified context changes on-line, as well as the amount of drift that could be tolerated before compensation was required. OLDEX can thus identify time and configuration contexts for the behavior data. This improved on previous methods, which either separated contexts off-line, or could not separate the slowly time-varying context into distinct regions at all. The results demonstrated the feasibility, usefulness, and potential of our unique idea for behavioral repetition and a propagating learning scheme.

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Creative Commons
The online version of this article is published within an Open Access environment subject to the conditions of the Creative Commons Attribution-NonCommercial-ShareAlike licence . The written permission of Cambridge University Press must be obtained for commercial re-use.
Copyright
Copyright © Cambridge University Press 2011. The online version of this article is published within an Open Access environment subject to the conditions of the Creative Commons Attribution-NonCommercial-ShareAlike licence <http://creativecommons.org/licenses/by-nc-sa/2.5/>. The written permission of Cambridge University Press must be obtained for commercial re-use.