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Addressing class imbalance in trust and stereotype assessment
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Player, C. and Griffiths, Nathan (2019) Addressing class imbalance in trust and stereotype assessment. In: Proceedings of the 21st International Workshop on Trust in Agent Societies, Montreal, Canada, 13-17 May 2019
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WRAP-addressing-class-imbalance-trust-stereotype-assessment-Griffiths-2019.pdf - Accepted Version - Requires a PDF viewer. Download (909Kb) | Preview |
Abstract
Trust, reputation and stereotypes enable agents to identify reliable interaction partners based on past interactions. However, such methods can cause agents to choose the same known partners instead of unknown, but potentially better, alternatives, giving rise to a class imbalance in their interaction histories. In this paper, we present a Class Imbalance Modification (CIM) method, to improve agents' initial assessments of others by becoming aware of the bias towards known agents. CIM enables an agent to determine whether data-driven trust, reputation and stereotypes are appropriate to assess a target agent, depending on how representative the agent's past interaction data is of the target. We also present a technique, Direct Comparative Stereotypes (DCS), which does not use past interaction data to make a stereotypical assessment, and so can be used if CIM concludes the data is inappropriate. Finally, CIM determines whether data-driven models have been rendered inappropriate by dynamic agent behaviour, where old interactions may no longer reflect current behaviour. Our results show that CIM significantly reduces error in a priori estimates, which improves partner selection and increases average utility.
Item Type: | Conference Item (Paper) | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Computer Science | ||||||
Official Date: | 14 May 2019 | ||||||
Dates: |
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Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||
Date of first compliant deposit: | 25 March 2019 | ||||||
Date of first compliant Open Access: | 16 September 2019 | ||||||
Conference Paper Type: | Paper | ||||||
Title of Event: | Proceedings of the 21st International Workshop on Trust in Agent Societies | ||||||
Type of Event: | Conference | ||||||
Location of Event: | Montreal, Canada | ||||||
Date(s) of Event: | 13-17 May 2019 | ||||||
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