Distributed Averaging in Opinion Dynamics
Distributed Averaging in Opinion Dynamics
复制标题
意见动态中的分布式平均
DOI:
10.1145/3583668.3594593
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发表时间:
2023
期刊:
影响因子:
--
通讯作者:
Berenbrink P
中科院分区:
文献类型:
--
作者:
Berenbrink P
We consider two simple asynchronous opinion dynamics on arbitrary graphs where every nodeuof the graph has an initial valueξu(0). In the first process, which we call theNodeModel, at each time stept≥ 0, a random nodeuand a random sample ofkof its neighboursυ1,υ2, ... ,υkare selected. Then,uupdates its current valueξu(t) to [EQUATION], whereα∈ (0, 1) andk≥ 1 are parameters of the process. In the second process, called theEdgeModel, at each step a random pair of adjacent nodes (u, υ) is selected, and then nodeuupdates its value equivalently to theNodeModelwithk =1 andυas the selected neighbour.For both processes, the values of all nodes converge to the same valueF, which is a random variable depending on the random choices made in each step. For theNodeModeland regular graphs, and for theEdgeModeland arbitrary graphs, the expectation ofFis the average of the initial values [EQUATION]. For theNodeModeland non-regular graphs, the expectation ofFis the degree-weighted average of the initial values.Our results are two-fold. We consider the concentration ofFand show tight bounds on the variance ofFfor regular graphs. We show that when the initial values do not depend on the number of nodes, then the variance is negligible, and hence the nodes are able to estimate the initial average of the node values. Interestingly, this variance does not depend on the graph structure. For the proof we introduce a duality between our processes and a process of two correlated random walks. We also analyse the convergence time for both models and for arbitrary graphs, showing bounds on the timeTεrequired to make all node values 'ε-close' to each other. Our bounds are asymptotically tight under some assumptions on the distribution of the initial values.
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影响因子:
1.6
作者:
D. Aldous;D. Lanoue
通讯作者:
D. Lanoue
DOI:
10.1007/978-3-662-43951-7_37
发表时间:
2014-04
期刊:
--
影响因子:
--
作者:
C. Cooper;Robert Elsässer;T. Radzik
通讯作者:
C. Cooper;Robert Elsässer;T. Radzik
DOI:
--
发表时间:
2015
期刊:
SIAM journal on computing (Print)
影响因子:
--
作者:
B. Chazelle
通讯作者:
B. Chazelle
影响因子:
1.1
作者:
Dimitris Fotakis;Vardis Kandiros;Vasilis Kontonis;Stratis Skoulakis
通讯作者:
Stratis Skoulakis
DOI:
--
发表时间:
2018
期刊:
J. Discrete Algorithms
影响因子:
--
作者:
C. Cooper;Nicolás Rivera
通讯作者:
Nicolás Rivera