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Outils d'observation et d'analyse de simulations multi-agents : l'expérience de la plate-forme Geamas/Biomas

Abstract : In order to help agricultural stakeholders improve their practices and minimize environmental risks, we developed a multi-agent model based on the Geamas modelling and simulation platform [Marcenac and Courdier, 1999]. This model, called Biomas [Courdier et al, 2002], allows us to simulate organic matter fluxes transferred amongst a set of farms located within a territory. Similarly to the Farmscape project leaded by CSIRO in Australia [McCown, 2002], our aim is to provide the agricultural stakeholders with a support to experiment by means of simulation various management options. After a preliminary phase of checking the model against various toy-examples, we are now about to apply the MAS model to support the farmers of Grand-Ilet (cirque of Salazie, Reunion Island) manage their livestock effluents. Actually, this community exhibits a very critical situation in terms of the environment as it concentrates on a very small agricultural land (187 ha) 25% of the pig production in Reunion, generating an amount of 17 000 m3 per year slurry. The simulation scenarios that must be addressed put into play over one hundred agents (farmers, livestock enterprises, means of transportation, slurry treatment unit, group of farmers). These agents of hybrid reactive/cognitive nature have the distinctive feature of being merely different one from each other. Each simulation gives thus rise to many intricate interactions particularly complex to analyse. In accordance with the ‘MAS philosophy’, the Geamas platform allows global observations to be performed of the overall represented agent system. However, in order to verify or explain this global behaviour, it is often necessary to be capable of monitoring the detailed individual behaviour of each agent, not only during the phase of model verification, but also for the simulations be well-accepted by the end-users in the next phase. Among existing MAS simulation platforms, one can distinguish between those having a generic aim, such as Jade, Madkit, Swarm,… that put forward model-building tools compared with tools to display and analyse simulation outputs and those devised with an aim of application to specific fields, as Cormas for renewable resource management [Bousquet et al, 1998], which, beyond functions enabling the display of observable data (spatial grid, time evolution graphics of variables) provide the user with few tools to analyse agent interactions. In front of this, we conceived a set of specific tools to display and analyse multi-agent simulations. These tools are described in this paper and their use illustrated upon one of the scenario studied in the framework of the real issue dealt with in Grand-Ilet. We conclude this paper by synthesizing the functions to be expected in agent simulation platforms to help both modellers and users interpret complex simulation scenarios outputs.
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https://hal.inrae.fr/hal-02828636
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Submitted on : Sunday, June 7, 2020 - 3:09:53 AM
Last modification on : Thursday, July 1, 2021 - 3:37:08 AM

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  • HAL Id : hal-02828636, version 1
  • PRODINRA : 353286

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Denis Payet, Jean-Michel Médoc, Tiana Ralambondrainy, Francois Guerrin, Rémy Courdier. Outils d'observation et d'analyse de simulations multi-agents : l'expérience de la plate-forme Geamas/Biomas. Colloque CABM-HEMA-SMAGET 2005, Mar 2005, Bourg-Saint-Maurice, France. 17 p. ⟨hal-02828636⟩

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