## 抄録

Forming effective coalitions is a major research challenge in AI and multi-agent systems (MAS). Coalition Structure Generation (CSG) involves partitioning a set of agents into coalitions so that social surplus (the sum of the rewards of all coalitions) is maximized. A partition is called a coalition structure (CS). In traditional works, the value of a coalition is given by a black box function called a characteristic function. In this paper, we propose a novel formalization of CSG, i.e., we assume that the value of a characteristic function is given by an optimal solution of a distributed constraint optimization problem (DCOP) among the agents of a coalition. A DCOP is a popular approach for modeling cooperative agents, since it is quite general and can formalize various application problems in MAS. At first glance, one might imagine that the computational costs required in this approach would be too expensive, since we need to solve an NP-hard problem just to obtain the value of a single coalition. To optimally solve a CSG, we might need to solve O (2 ^{n}) DCOP problem instances, where n is the number of agents. However, quite surprisingly, we show that an approximation algorithm, whose computational cost is about the same as solving just one DCOP, can find a CS with quality guarantees. More specifically, we develop an algorithm with parameter k that can find a CS whose social surplus is at least max(k/w* + 1), k/[n/2/) of the optimal CS, where w* is the tree width of a constraint graph. When k = 1, the complexity of this algorithm is about the same as solving just one DCOP. These results illustrate that the locality of interactions among agents, which is explicitly modeled in the DCOP formalization, is quite useful in developing an efficient CSG algorithm with quality guarantees.

本文言語 | 英語 |
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ホスト出版物のタイトル | AAAI-10 / IAAI-10 - Proceedings of the 24th AAAI Conference on Artificial Intelligence and the 22nd Innovative Applications of Artificial Intelligence Conference |

出版社 | AI Access Foundation |

ページ | 197-203 |

ページ数 | 7 |

ISBN（印刷版） | 9781577354642 |

出版ステータス | 出版済み - 2010 |

イベント | 24th AAAI Conference on Artificial Intelligence and the 22nd Innovative Applications of Artificial Intelligence Conference, AAAI-10 / IAAI-10 - Atlanta, GA, 米国 継続期間: 7月 11 2010 → 7月 15 2010 |

### 出版物シリーズ

名前 | Proceedings of the National Conference on Artificial Intelligence |
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巻 | 1 |

### その他

その他 | 24th AAAI Conference on Artificial Intelligence and the 22nd Innovative Applications of Artificial Intelligence Conference, AAAI-10 / IAAI-10 |
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国/地域 | 米国 |

City | Atlanta, GA |

Period | 7/11/10 → 7/15/10 |

## !!!All Science Journal Classification (ASJC) codes

- ソフトウェア
- 人工知能