|Author:||Lam, Bun Martin|
|Title:||Learning global feature weights for clustering and classification of cases|
Hong Kong Polytechnic University -- Dissertations
Department of Computing
|Pages:||vii, 67 leaves : ill. (some col.) ; 30 cm|
|Abstract:||Case-Based Reasoning (CBR) systems have increased awareness in the last few years. A CBR system is a means to store, share and re-use experience. CBR is based on the idea that new problems can often be solved by using past solutions. The basic method used to implement CBR is to build a case-base of previously solved problems. These cases are then retrieved and adapted to solve new problems. However, when the case-base is growing up to a large scale, the Case-Base Maintenance (CBM) issue will become very important. This project presents a CBM methodology for clustering and classification of cases in case-base systems from scratch, which uses little or no domain-specific knowledge, consists of two phases. The first phase is to evaluate feature importance, i.e., learning global feature weights from the case-base. This algorithm can recognize salient features and eliminate irrelevant features from the case-base. Its results are helpful to provide a reasonable clustering of the case-base. The second phase is to partition the case-base; the clusters identified convey different concepts within the case-base. Each of these concepts signifies a subset of the problem domain that differs characteristically from the rest of the domain. The effectiveness of the method is demonstrated experimentally on Boston Housing Data and Pima Indians Diabetes Database. Experimental analysis of our methodology shows promising results: the performance of clustering with learned feature weights is much better than the performance without feature weights.|
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