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Inconsistency: Friend or Foe
University of Borås.
University of Borås.
Högskolan i Skövde, Institutionen för kommunikation och information. Högskolan i Skövde, Forskningscentrum för Informationsteknologi.
2007 (engelsk)Inngår i: Proceedings of International Joint Conference on Neural Networks, Orlando, Florida, USA, August 12-17, 2007, IEEE Press, 2007, s. 1383-1388Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

One way of obtaining accurate yet comprehensible models is to extract rules from opaque predictive models. When evaluating rule extraction algorithms, one frequently used criterion is consistency; i.e. the algorithm must produce similar rules every time it is applied to the same problem. Rule extraction algorithms based on evolutionary algorithms are, however, inherently inconsistent, something that is regarded as their main drawback. In this paper, we argue that consistency is an overvalued criterion, and that inconsistency can even be beneficial in some situations. The study contains two experiments, both using publicly available data sets, where rules are extracted from neural network ensembles. In the first experiment, it is shown that it is normally possible to extract several different rule sets from an opaque model, all having high and similar accuracy. The implication is that consistency in that perspective is useless; why should one specific rule set be considered superior? Clearly, it should instead be regarded as an advantage to obtain several accurate and comprehensible descriptions of the relationship. In the second experiment, rule extraction is used for probability estimation. More specifically, an ensemble of extracted trees is used in order to obtain probability estimates. Here, it is exactly the inconsistency of the rule extraction algorithm that makes the suggested approach possible.

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IEEE Press, 2007. s. 1383-1388
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URN: urn:nbn:se:his:diva-2104DOI: 10.1109/IJCNN.2007.4371160ISI: 000254291101059Scopus ID: 2-s2.0-51749099818ISBN: 978-1-4244-1380-5 OAI: oai:DiVA.org:his-2104DiVA, id: diva2:32380
Tilgjengelig fra: 2008-05-30 Laget: 2008-05-30 Sist oppdatert: 2017-11-27

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Forlagets fulltekstScopushttp://www.ieeexplore.ieee.org/iel5/4370890/4370891/04371160.pdf?tp=&isnumber=4370891&arnumber=4371160

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