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A cooperative game-theoretic approach to the social ridesharing problem

Bistaffa, Filippo, Farinelli, Alessandro, Chalkiadakis, Georgios and Ramchurn, Sarvapali (2017) A cooperative game-theoretic approach to the social ridesharing problem Artificial Intelligence Journal., 246, pp. 86-117. (doi:10.1016/j.artint.2017.02.004).

Record type: Article


In this work, we adopt a cooperative game theoretic approach in order to tackle the social ridesharing (SR) problem, where a set of commuters, connected through a social network, form coalitions and arrange one-time rides at short notice. In particular, we address two fundamental aspects of this problem. First, we focus on the optimisation problem of forming the travellers' coalitions that minimise the travel cost of the overall system. To this end, we model the formation problem as a Graph-Constrained Coalition Formation (GCCF) one, where the set of feasible coalitions is restricted by a graph (i.e., the social network). Our approach allows users to specify both spatial and temporal preferences for the trips. Second, we tackle the payment allocation aspect of SR, by proposing the first approach that computes kernel-stable payments for systems with thousands of agents. We conduct a systematic empirical evaluation that uses real-world datasets (i.e., GeoLife and Twitter). We are able to compute optimal solutions for medium-sized systems (i.e., with 100 agents), and high quality solutions for very large systems (i.e., up to 2000 agents). Our results show that our approach improves the social welfare (i.e., reduces travel costs) by up to 36.22% with respect to the scenario with no ridesharing. Finally, our payment allocation method computes kernel-stable payments for 2000 agents in less than an hour—while the state of the art is able to compute payments only for up to 100 agents, and does so 84 times slower than our approach.

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Accepted/In Press date: 15 February 2017
e-pub ahead of print date: 24 February 2017
Published date: 1 May 2017
Organisations: Agents, Interactions & Complexity


Local EPrints ID: 407399
PURE UUID: 29bbbbd9-a6c6-4391-b897-112c11e3decc
ORCID for Sarvapali Ramchurn: ORCID iD

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Date deposited: 05 Apr 2017 01:07
Last modified: 17 Jul 2017 13:53

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Author: Filippo Bistaffa
Author: Alessandro Farinelli
Author: Georgios Chalkiadakis
Author: Sarvapali Ramchurn ORCID iD

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