Abstract
Active research into processes and techniques for extracting the knowledge
embedded within trained artificial neural networks has continued
unabated for almost ten years. Given the considerable effort invested
to date, what progress has been made? What lessons have been learned?
What direction should the field take from here? This paper seeks
to answer these questions. The focus is primarily on techniques for
extracting rule-based explanations from feed-forward ANNs since,
to date, the preponderance of the effort has been expended in this
arena. However the paper also briefly reviews the broadening overall
agenda for ANN knowledge-elicitation. Finally the paper identifies
some of the key research questions including the search for criteria
for deciding in which problem domains these techniques are likely
to out-perform techniques such as Inductive Decision Trees.
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