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finite time analysis of the multiarmed bandit problem 1. Finite-time Analysis of the
Multiarmed Bandit
Problem
PETER AUER,University of Technology Graz
NICOL`O CESA-BIANCHI, University of Milan
PAUL FISCHER, Universitat Dortmund
ICML 2002)
(ICML 2002
@shima_x
2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. Proofs
◆ Proof of Theorem 1 UCB1
1(UCB1
UCB1の各マシンのプレイ回数のバウンド)
より
i
敵対的設定にマシンiのアル
ゴリズムが勝利した場合
T*は敵対的な
T
設定のTの意味
20. 21. 22. Proofs
◆ Proof of Theorem 1 UCB1
1( UCB1の各マシンのプレイ回数のバウンド)
一回あたりのリグ
レットがΔである事
より
となり、リグレット上限が示された
23. Proofs
◆ Proof of Theorem 3 ε-greedy
3( -greedy
-greedyの各マシンのプレイされる確率のバウンド)
探索確率
最適なマシンと判断された場合の確率
24. 25. Proofs
◆ Proof of Theorem 3 ε-greedy
3( -greedy
-greedyの各マシンのプレイされる確率のバウン
ド)
x_0
x_0で分割して変形して和をとってい
ると思うが・・・
26. Proofs
◆ Proof of Theorem 3 ε-greedy
3( -greedy
-greedyの各マシンのプレイされる確率のバウン
ド)
-最適なマシンと判断されない場合のプレイ回数
27. 28. 29.