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Behavior abstraction robustness in agent modeling
Örebro University, School of Science and Technology. (AASS)
Örebro University, School of Science and Technology. (AASS)ORCID iD: 0000-0002-1470-6288
2012 (English)In: Web Intelligence and Intelligent Agent Technology (WIIAT), IEEE Computer Society Digital Library, 2012, p. 228-235Conference paper, Published paper (Refereed)
Abstract [en]

Due to the "generative" nature of the macro phenomena, agent-based systems require experience from the modeler to determine the proper low-level agent behavior. Adaptive and learning agents can facilitate this task: Partial or preliminary learnt versions of the behavior can serve as inspiration for the human modeler. Using a simulation process we develop agents that explore sensors and actuators inside a given environment. The exploration is guided by the attribution of rewards to their actions, expressed in an objective function. These rewards are used to develop a situation-action mapping, later abstracted to a human-readable format. In this contribution we test the robustness of a decision-tree-representation of the agent's decision-making process with regards to changes in the objective function. The importance of this study lies on understanding how sensitive the definition of the objective function is to the final abstraction of the model, not merely to a performance evaluation.

Place, publisher, year, edition, pages
IEEE Computer Society Digital Library, 2012. p. 228-235
Keywords [en]
Multiagent systems
National Category
Computer Sciences
Research subject
Computer Science
Identifiers
URN: urn:nbn:se:oru:diva-29233DOI: 10.1109/WI-IAT.2012.157OAI: oai:DiVA.org:oru-29233DiVA, id: diva2:623920
Conference
2012 IEEE/WIC/ACM International Conferences on Web Intelligence and Intelligent Agent Technology (WI-IAT), Dec, 4-7 2012, Macau, China
Available from: 2013-05-29 Created: 2013-05-29 Last updated: 2018-01-11Bibliographically approved
In thesis
1. A Learning-driven Approach for Behavior Modeling in Agent-based Simulation
Open this publication in new window or tab >>A Learning-driven Approach for Behavior Modeling in Agent-based Simulation
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Agent-based simulation is a prominent application of the agent-based system metaphor. One of the main characteristics of this simulation paradigm is the generative nature of the outcome: the macro-level system behavior is generated from the micro-level agent behavior. Designing this agent behavior becomes challenging, as it is not clear how much each individual agent will contribute to the macro-level phenomenon in the simulation.

Agent learning has proven to be successful for behavior configuration and calibration in many domains. It can also be used to mitigate the design challenge here. Agents learn their behaviors, adapted towards their micro and some macro level goals in the simulation. However, machine learning techniques that in principle could be used in this context usually constitute black-boxes, to which the modeler has no access to understand what was learned.

This thesis proposes an engineering method for developing agent behavior using agent learning. The focus of learning hereby is not on improving performance, but in supporting a modeling endeavor: the results must be readable and explainable to and by the modeler. Instead of pre-equipping the agents with a behavior program, a model of the behavior is learned from scratch within a given environmental model.

The following are the contributions of the research conducted: a) a study of the general applicability of machine learning as means to support agent behavior modeling: different techniques for learning and abstracting the behavior learned were reviewed; b) the formulation of a novel engineering method encapsulating the general approach for learning behavior models: MABLe (Modeling Agent Behavior by Learning); c) the construction of a general framework for applying the devised method inside an easy-accessible agent-based simulation tool; d) evaluating the proposed method and framework.

This thesis contributes to advancing the state-of-the-art in agent-based simulation engineering: the individual agent behavior design is supported by a novel engineering method, which may be more adapted to the general way modelers proceed than others inspired by software engineering.

Place, publisher, year, edition, pages
Örebro: Örebro University, 2017. p. 58
Series
Örebro Studies in Technology, ISSN 1650-8580 ; 75
Keywords
agent-based simulation, agent modeling, agent learning
National Category
Information Systems
Identifiers
urn:nbn:se:oru:diva-61117 (URN)978-91-7529-208-3 (ISBN)
Public defence
2017-11-13, Örebro universitet, Teknikhuset, Hörsal T, Fakultetsgatan 1, Örebro, 09:00 (English)
Opponent
Supervisors
Available from: 2017-09-25 Created: 2017-09-25 Last updated: 2018-01-13Bibliographically approved

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