Local Pattern Detection

Local Pattern Detection

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Introduction The dramatic increase in available computer storage capacity over the last 10 years has led to the creation of very large databases of scienti?c and commercial information. The need to analyze these masses of data has led to the evolution of the new ?eld knowledge discovery in databases (KDD) at the intersection of machine learning, statistics and database technology. Being interdisciplinary by nature, the ?eld o?ers the opportunity to combine the expertise of di?erent ?elds intoacommonobjective.Moreover, withineach?elddiversemethodshave been developed and justi?ed with respect to di?erent quality criteria. We have toinvestigatehowthesemethods cancontributeto solvingthe problemofKDD. Traditionally, KDD was seeking to ?nd global models for the data that - plain most of the instances of the database and describe the general structure of the data. Examples are statistical time series models, cluster models, logic programs with high coverageor classi?cation models like decision trees or linear decision functions. In practice, though, the use of these models often is very l- ited, because global models tend to ?nd only the obvious patterns in the data, 1 which domain experts already are aware of . What is really of interest to the users are the local patterns that deviate from the already-known background knowledge. David Hand, who organized a workshop in 2002, proposed the new ?eld of local patterns.:-modeb(*, instantiate(+shape)). exactly one feature is generated: f1(A) :- hasCar( A, B), hasLoad(B, C), hasShape(C, D), instantiate(D). ... The following constraints are used: (a) no feature should have the same value for all examples and (b) no two features should have the ... ways of their setting, this can be however found in the RSD usera#39;s manual available from the above mentioned RSD download page . ... The Mutagenesis data have 80 Nada Lavrac, Filip E‡ZeleznA½, and SaE‡so Dzeroski.

Title:Local Pattern Detection
Author: Katharina Morik, Jean-Francois Boulicaut, Arno Siebes
Publisher:Springer - 2005-07-11

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