Istituto di Scienza e Tecnologie dell'Informazione     
Lucchese C., Boley M., Paurat D., Gartner T. Direct local pattern sampling by efficient two-step random procedures. In: KDD'11 - ACM SIGKDD Conference on Knowledge Discovery and Data Mining (San Diego, USA, 21-24 August 2011). Proceedings, pp. 582 - 590. ACM, 2011.
We present several exact and highly scalable local pattern sampling algorithms. They can be used as an alternative to exhaustive local pattern discovery methods (e.g, frequent set mining or optimistic-estimator-based subgroup discovery) and can substantially improve efficiency as well as con- trollability of pattern discovery processes. While previous sampling approaches mainly rely on the Markov chain Monte Carlo method, our procedures are direct, i.e., non process- simulating, sampling algorithms. The advantages of these direct methods are an almost optimal time complexity per pattern as well as an exactly controlled distribution of the produced patterns. Namely, the proposed algorithms can sample (item-)sets according to frequency, area, squared fre- quency, and a class discriminativity measure. Experiments demonstrate that these procedures can improve the accuracy of pattern-based models similar to frequent sets and often also lead to substantial gains in terms of scalability.
URL: http://dl.acm.org/citation.cfm?id=2020500&CFID=61806564&CFTOKEN=64940966
DOI: 10.1145/2020408.2020500
Subject Local pattern discovery
Pattern- based classification
Frequent sets
H.2.8 Database Applications. Data Mining

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