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- Path: sparky!uunet!mcsun!uknet!cam-eng!ckt
- From: ckt@eng.cam.ac.uk (C.K. Tham)
- Newsgroups: comp.robotics
- Subject: Reinforcement Learning for Robot Control
- Message-ID: <1992Sep2.171431.12671@eng.cam.ac.uk>
- Date: 2 Sep 92 17:14:31 GMT
- Sender: ckt@eng.cam.ac.uk (C.K. Tham)
- Distribution: comp.robotics
- Organization: Cambridge University Engineering Department, UK
- Lines: 50
- Nntp-Posting-Host: dsl.eng.cam.ac.uk
-
-
- TECHNICAL REPORT ANNOUNCEMENT
-
- The following technical report is available via anonymous ftp:
-
- REINFORCEMENT LEARNING FOR MULTI-LINKED MANIPULATOR CONTROL
- by Chen K. Tham & Richard W. Prager.
- (Technical Report CUED/F-INFENG/TR104)
-
- Abstract:
-
- We present a trajectory planning and obstacle avoidance method which uses
- Reinforcement Learning to learn the appropriate real-valued torques to
- apply at each joint of a simulated two-linked manipulator in order to move
- the end-effector to a desired destination in the workspace. The inputs to
- the controller are the joint positions and velocities which are fed
- directly into a Cerebellar Model Arithmetic Computer (CMAC) (Albus,75). In
- each state, the expected reward and appropriate torques for each joint are
- learnt through self-experimentation using a combination of the Temporal
- Difference (TD) technique (Sutton,87) and stochastic hillclimbing
- (Williams,88). Actions which cause the manipulator to reach the desired
- destination are rewarded whereas actions which lead to collisions with
- either joint limits or obstacles are punished by an amount proportional to
- the velocity before collision. After training, the manipulator is able to
- move along smooth collision-free paths from different start positions in
- the workspace to the destination.
-
- The file is in compressed Postscript format.
-
- Procedure for obtaining the report:
-
- unix> ftp svr-ftp.eng.cam.ac.uk
- Name: anonymous
- Password: (your e-mail address)
- ftp> cd reports
- ftp> binary
- ftp> get tham_tr104.ps.Z
- ftp> quit
- unix> uncompress tham_tr104.ps.Z
- unix> lpr tham_tr104.ps .. etc. .. to print
-
- The authors welcome comments and suggestions from readers.
-
- ----------------------------------------------------------------------------
- Chen K. THAM, E-mail: ckt@eng.cam.ac.uk
- Speech, Vision and Robotics Group, Tel. : +44 223 332754
- Cambridge University Engineering Department, Fax : +44 223 332662
- Trumpington Street,
- Cambridge CB2 1PZ,
- United Kingdom.
-