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arXiv 1909.03485math.OC
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社会Hegselmann-Krause动力学的收敛性

On the Convergence Properties of Social Hegselmann-Krause Dynamics

Rohit Parasnis, Massimo Franceschetti, Behrouz Touri

摘要:

我们研究社会Hegselmann-Krause动态的收敛特性,Hegselmann-Krause(HK)模型的意见动态,其中一个物理连接图,占外在因素,可以防止某些对代理之间的相互作用被纳入。相对于原来的HK动态(在有限时间内终止),我们表明,任何潜在的连接和不完整的图,在一定的温和的假设下,社会HK动态的预期终止时间是无穷大。然后,我们调查的收敛速率到稳定状态,并提供界的最大$ε$收敛时间的物理连接图的属性。我们扩展了这一讨论,并观察到,几乎所有的$n$,存在一个$n$ -顶点物理连接图上的社会HK动态可能甚至没有$ε$ -收敛到一个有界的时间框架内的稳定状态。然后,我们提供了近紧的充要条件,任意缓慢的合并(一种现象,是必不可少的任意缓慢的$ε$ -收敛到稳态)。利用这些必要条件,我们证明了完全$r$ -部图具有有界的$ε$ -收敛时间.

英文摘要:

We study the convergence properties of Social Hegselmann-Krause dynamics, a {variant} of the Hegselmann-Krause (HK) model of opinion dynamics where a physical connectivity graph that accounts for the extrinsic factors that could prevent interaction between certain pairs of agents is incorporated. As opposed to the original HK dynamics (which terminate in finite time), we show that for any underlying connected and incomplete graph, under a certain mild assumption, the expected termination time of social HK dynamics is infinity. We then investigate the rate of convergence to the steady state, and provide bounds on the maximum $ε$-convergence time in terms of the properties of the physical connectivity graph. We extend this discussion and observe that for almost all $n$, there exists an $n$-vertex physical connectivity graph on which social HK dynamics may not even $ε$-converge to the steady state within a bounded time frame. We then provide nearly tight necessary and sufficient conditions for arbitrarily slow merging (a phenomenon that is essential for arbitrarily slow $ε$-convergence to the steady state). Using the necessary conditions, we show that complete $r$-partite graphs have bounded $ε$-convergence times.

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