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Behavior tree (artificial intelligence, robotics and control)
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Behavior tree (artificial intelligence, robotics and control) : ウィキペディア英語版
Behavior tree (artificial intelligence, robotics and control)

A behavior tree (BT) is a mathematical model of plan execution used in computer science, robotics, control systems and video games. They describe switchings between a finite set of tasks in a modular fashion. Their strength comes from their ability to create very complex tasks composed of simple tasks, without worrying how the simple tasks are implemented. BTs present some similarities to hierarchical state machines with the key difference that the main building block of a behavior is a task rather than a state. Its ease of human understanding make BTs less error prone and very popular in the game developer community.
== Background ==

BTs originates from the computer game industry as a powerful tool to model the behavior of non-player characters (NPCs).〔Isla D. 2005. ( Handling complexity in the Halo 2 AI. In Game Developers Conference (Vol. 12) )〕〔Champandard A. 2007. ( Understanding BTs. AiGameDev. com, 6 )〕〔Isla D. 2008. Halo 3-building a better battle. In Game Developers Conference. 2008.〕〔Lim, C. U., Baumgarten, R., & Colton, S. 2010. (Evolving behaviour trees for the commercial game DEFCON. In Applications of Evolutionary Computation, pp. 100-110. Springer Berlin Heidelberg, 2010. )〕
They have been extensively used in high profile video games such as Halo, Bioshock, and Spore. Recent works propose BTs as a multi-mission control framework for UAV, complex robots, robotic manipulation, and multi-robot systems.〔Ögren, Petter. ("Increasing Modularity of UAV Control Systems using Computer Game BTs." In AIAA Guidance, Navigation and Control Conference, Minneapolis, Minnesota, pp. 13-16. 2012. )〕〔Colledanchise, Michele, Marzinotto Alejandro, and Ögren Petter.( "Performance Analysis of Stochastic BTs." In Robotics and Automation (ICRA), 2014 IEEE International Conference on. 2014. )〕〔Marzinotto, Alejandro, Colledanchise Michele, Smith Christian, and Ögren Petter. ( "Towards a Unified BTs Framework for Robot Control." In Robotics and Automation (ICRA), 2014 IEEE International Conference on. 2014. )〕〔Klöckner, Andreas. "Interfacing BTs with the World Using Description Logic." In AIAA Guidance, Navigation and Control Conference, Boston, MA. 2013.〕〔Klöckner, Andreas. "Behavior Trees for UAV Mission Management." In GI-Jahrestagung, pp. 57-68. 2013.〕〔Bagnell, J. Andrew, Felipe Cavalcanti, Lei Cui, Thomas Galluzzo, Martial Hebert, Moslem Kazemi, Matthew Klingensmith et al. "An integrated system for autonomous robotics manipulation." In Intelligent Robots and Systems (IROS), 2012 IEEE/RSJ International Conference on, pp. 2955-2962. IEEE, 2012.〕

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