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| Content Provider | Springer Nature Link |
|---|---|
| Author | Tamosiunaite, Minija Asfour, Tamim Wörgötter, Florentin |
| Copyright Year | 2009 |
| Abstract | Reinforcement learning methods can be used in robotics applications especially for specific target-oriented problems, for example the reward-based recalibration of goal directed actions. To this end still relatively large and continuous state-action spaces need to be efficiently handled. The goal of this paper is, thus, to develop a novel, rather simple method which uses reinforcement learning with function approximation in conjunction with different reward-strategies for solving such problems. For the testing of our method, we use a four degree-of-freedom reaching problem in 3D-space simulated by a two-joint robot arm system with two DOF each. Function approximation is based on 4D, overlapping kernels (receptive fields) and the state-action space contains about 10,000 of these. Different types of reward structures are being compared, for example, reward-on- touching-only against reward-on-approach. Furthermore, forbidden joint configurations are punished. A continuous action space is used. In spite of a rather large number of states and the continuous action space these reward/punishment strategies allow the system to find a good solution usually within about 20 trials. The efficiency of our method demonstrated in this test scenario suggests that it might be possible to use it on a real robot for problems where mixed rewards can be defined in situations where other types of learning might be difficult. |
| Starting Page | 249 |
| Ending Page | 260 |
| Page Count | 12 |
| File Format | |
| ISSN | 03401200 |
| Journal | Biological Cybernetics |
| Volume Number | 100 |
| Issue Number | 3 |
| e-ISSN | 14320770 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2009-02-20 |
| Publisher Place | Berlin/Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Reinforcement learning Function approximation Robot control Neurosciences Computer Application in Life Sciences Neurobiology Bioinformatics Statistical Physics, Dynamical Systems and Complexity |
| Content Type | Text |
| Resource Type | Article |
| Subject | Computer Science Biotechnology |
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