Robot Awareness in Cooperative Mobile Robot Learning

  • Authors:
  • Claude F. Touzet

  • Affiliations:
  • Center for Engineering Science Advanced Research, Computer Science and Mathematics Division, Oak Ridge National Laboratory, P.O. 2008, Oak Ridge, TN 37831-6355, USA. touzetc@mars.epm.ornl.gov

  • Venue:
  • Autonomous Robots
  • Year:
  • 2000

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Abstract

Most of the straight-forward learning approaches in cooperativerobotics imply for each learning robot a state space growthexponential in the number of team members. To remedy theexponentially large state space, we propose to investigate a lessdemanding cooperation mechanism—i.e., various levels ofawareness—instead of communication. We define awareness asthe perception of other robots locations and actions. We recognizefour different levels (or degrees) of awareness which imply differentamounts of additional information and therefore have differentimpacts on the search space size (&THgr;(0), &THgr;(1),&THgr;(N), o(N),^1 where Nis the number of robots in the team). There are trivial arguments in favor ofavoiding binding the increase of the search space size to the numberof team members. We advocate that, by studying the maximum number ofneighbor robots in the application context, it is possible to tunethe parameters associated with a &THgr;(1) increase of the searchspace size and allow good learning performance. We use thecooperative multi-robot observation of multiple moving targets(CMOMMT) application to illustrate our method. We verify thatawareness allows cooperation, that cooperation shows betterperformance than a purely collective behavior and that learnedcooperation shows better results than learned collective behavior.