Abstract
We study the effectiveness of consensus formation in multi-agent systems where there is both belief updating based on direct evidence and also belief combination between agents. In particular, we consider the scenario in which a population of agents collaborate on the best-of-n problem where the aim is to reach a consensus about which is the best (alternatively, true) state from amongst a set of states, each with a different quality value (or level of evidence). Agents’ beliefs are represented within Dempster-Shafer theory by mass functions and we investigate the macro-level properties of four well-known belief combination operators for this multi-agent consensus formation problem: Dempster’s rule, Yager’s rule, Dubois & Prade’s operator and the averaging operator. The convergence properties of the operators are considered and simulation experiments are conducted for different evidence rates and noise levels. Results show that a combination of updating on direct evidence and belief combination between agents results in better consensus to the best state than does evidence updating alone. We also find that in this framework the operators are robust to noise. Broadly, Yager’s rule is shown to be the better operator under various parameter values, i.e. convergence to the best state, robustness to noise, and scalability.
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Notes
- 1.
We utilise roulette wheel selection; a proportionate selection process.
- 2.
Due to the possibility of rounding errors occurring as a result of the multiplication of small numbers close to 0, we renormalise the mass function that results from each process.
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Acknowledgments
This work was funded and delivered in partnership between Thales Group, University of Bristol and with the support of the UK Engineering and Physical Sciences Research Council, ref. EP/R004757/1 entitled “Thales-Bristol Partnership in Hybrid Autonomous Systems Engineering (T-B PHASE)”.
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Crosscombe, M., Lawry, J., Bartashevich, P. (2019). Evidence Propagation and Consensus Formation in Noisy Environments. In: Ben Amor, N., Quost, B., Theobald, M. (eds) Scalable Uncertainty Management. SUM 2019. Lecture Notes in Computer Science(), vol 11940. Springer, Cham. https://doi.org/10.1007/978-3-030-35514-2_23
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