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| Content Provider | ACM Digital Library |
|---|---|
| Author | Silver, David Gelly, Sylvain |
| Abstract | The UCT algorithm learns a value function online using sample-based search. The TD(λ) algorithm can learn a value function offline for the on-policy distribution. We consider three approaches for combining offline and online value functions in the UCT algorithm. First, the offline value function is used as a default policy during Monte-Carlo simulation. Second, the UCT value function is combined with a rapid online estimate of action values. Third, the offline value function is used as prior knowledge in the UCT search tree. We evaluate these algorithms in 9 x 9 Go against GnuGo 3.7.10. The first algorithm performs better than UCT with a random simulation policy, but surprisingly, worse than UCT with a weaker, handcrafted simulation policy. The second algorithm outperforms UCT altogether. The third algorithm outperforms UCT with handcrafted prior knowledge. We combine these algorithms in MoGo, the world's strongest 9 x 9 Go program. Each technique significantly improves MoGo's playing strength. |
| Starting Page | 273 |
| Ending Page | 280 |
| Page Count | 8 |
| File Format | |
| ISBN | 9781595937933 |
| DOI | 10.1145/1273496.1273531 |
| Language | English |
| Publisher | Association for Computing Machinery (ACM) |
| Publisher Date | 2007-06-20 |
| Publisher Place | New York |
| Access Restriction | Subscribed |
| Content Type | Text |
| Resource Type | Article |
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