A Case-Based Explanation System for Black-Box Systems

Authors:
Conor Nugent;Pádraig Cunningham
Affiliations:
Department of Computer Science, Trinity College, Machine Learning Group, University of Dublin, Dublin, Ireland;Department of Computer Science, Trinity College, Machine Learning Group, University of Dublin, Dublin, Ireland
Venue:
Artificial Intelligence Review
Year:
2005

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Abstract

Most users of machine-learning products are reluctant to use them without any sense of the underlying logic that has led to the system's predictions. Unfortunately many of these systems lack any transparency in the way they operate and are deemed to be black boxes. In this paper we present a Case-Based Reasoning (CBR) solution to providing supporting explanations of black-box systems. This CBR solution has two key facets; it uses local information to assess the importance of each feature and using this, it selects the cases from the data used to build the black-box system for use in explanation. The retrieval mechanism takes advantage of the derived feature importance information to help select cases that are a better reflection of the black-box solution and thus more convincing explanations.