Impartial Selection with Additive Guarantees via Iterated Deletion

Impartial Selection with Additive Guarantees via Iterated Deletion
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通过迭代删除提供附加保证的公正选择

DOI:
10.1145/3490486.3538294
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发表时间:
2022
期刊:
--
影响因子:
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通讯作者:
Cembrano J
Cembrano J
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--
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作者:
Cembrano J

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公平选择是根据群体中其他成员的提名从群体中选择一个人,以这种方式,个人不能影响自己的选择机会。我们给出了一个确定性机制,在n个个体的情况下,每个个体都有O(nκ)个提名,其中κ∈[0,1],其附加性能保证为O(n(1+κ)/2)。对于κ=0,即当每个人至多投一个常数数量的提名时,这个界限是O(n)。这与最著名的随机机制和单一提名的保证相匹配。对于k =1,边界是O(n)。这是微不足道的,因为即使是从不选择的机制也会提供n-1的附加保证。然而,我们证明,这也是最好的可能性:对于每一个确定性的公正机制,都存在这样一种情况,即某个人被其他每个人提名,该机制要么不选择,要么选择一个没有被任何人提名的人。
Impartial selection is the selection of an individual from a group based on nominations by other members of the group, in such a way that individuals cannot influence their own chance of selection. We give a deterministic mechanism with an additive performance guarantee of O(n(1+κ)/2) in a setting with n individuals where each individual casts O(nκ) nominations, where κ∈[0,1]. For κ=0, i.e. when each individual casts at most a constant number of nominations, this bound is O(√n). This matches the best-known guarantee for randomized mechanisms and a single nomination. For κ=1 the bound is O(n). This is trivial, as even a mechanism that never selects provides an additive guarantee of n-1. We show, however, that it is also best possible: for every deterministic impartial mechanism there exists a situation in which some individual is nominated by every other individual and the mechanism either does not select or selects an individual not nominated by anyone.
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