• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1
  • Tagged with
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Meta-heur?sticas de otimiza??o tradicionais e h?bridas utilizadas para constru??o de comit?s de classifica??o

Feitosa Neto, Antonino Alves 09 December 2016 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-04-17T21:35:20Z No. of bitstreams: 1 AntoninoAlvesFeitosaNeto_TESE.pdf: 1592913 bytes, checksum: abef6d747d95842e55a8f4f5a5d73859 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-04-18T22:17:06Z (GMT) No. of bitstreams: 1 AntoninoAlvesFeitosaNeto_TESE.pdf: 1592913 bytes, checksum: abef6d747d95842e55a8f4f5a5d73859 (MD5) / Made available in DSpace on 2017-04-18T22:17:06Z (GMT). No. of bitstreams: 1 AntoninoAlvesFeitosaNeto_TESE.pdf: 1592913 bytes, checksum: abef6d747d95842e55a8f4f5a5d73859 (MD5) Previous issue date: 2016-12-09 / Este trabalho aborda a constru??o de comit?s de classifica??o atrav?s t?cnicas metaheur?sticas de otimiza??o tradicionais de h?bridas. O problema de classifica??o de padr?es ? tratado como um problema de otimiza??o procurando encontrar o subconjunto de atributos e classificadores do problema que minimize o erro de classifica??o do comit?. Os comit?s s?o gerados a partir da combina??o das t?cnicas de k-NN, ?rvore de Decis?o e Naive Bayes utilizando o voto majorit?rio. Os atributos dos classificadores base s?o modificados pelas metaheur?sticas de algoritmos gen?ticos, algoritmos mem?ticos, PSO, ACO, M?ltiplos Rein?cios, GRASP, Simulated Annealing, Busca Tabu, ILS e VNS. Tamb?m s?o aplicados algoritmos provenientes da arquiteturas de metaheur?sticas h?bridas AMHM e MAGMA. S?o desenvolvidos algoritmos dessas metaheur?sticas nas vers?es mono e multi-objetivo. S?o realizados experimentos em diferentes cen?rios mono e multiobjetivo otimizando o erro de classifica??o e as medidas de boa e m? diversidade. O objetivo ? verificar se adicionar as medidas de diversidade como objetivos de otimiza??o resulta em comit?s mais acurados. Assim, a contribui??o desse trabalho ? determinar se as medidas de boa e m? diversidade podem ser utilizadas em t?cnicas de otimiza??o mono e multiobjetivo como objetivos de otimiza??o para constru??o de comit?s de classificadores mais acurados que aqueles constru?dos pelo mesmo processo, por?m utilizando somente a acur?cia de classifica??o como objetivo de otimiza??o. Verificamos que as metaheur?sticas desenvolvidas apresentam melhores resultados que as t?cnicas cl?ssicas de gera??o de comit?s, isto ?, Bagging, Boosting e Sele??o Rand?mica. Verificamos tamb?m que na maioria das metaheur?sticas o uso das medidas de diversidade como objetivos de otimiza??o n?o auxilia na gera??o de comit?s mais acurados que quando utilizado somente o erro de classifica??o como objetivo de otimiza??o obtendo nos melhores cen?rios resultados n?o estatisticamente diferentes. / This work deals with the construction of classification committees using traditional and hybrid meta-heuristics of optimization techniques. The problem of pattenr classification is treated as an optimization problem, trying to find the subset of attributes and classifiers of the problem that minimizes the classification error of the committee. Committees are generated by combining the techniques of k-NN, Decision Tree and Naive Bayes using the majority vote. The attributes of the base classifiers are modified by the metaheuristics of genetic algorithms, memetic algorithms, PSO, ACO, Multi Start, GRASP, Simulated Annealing, Tabu Search, ILS and VNS. We also apply algorithms from AMHM and MAGMA hybrid metaheuristics architectures. Algorithms of these metaheuristics are developed in mono and multi-objective versions. Experiments are performed in different mono and multiobjective scenarios optimizing classification error and measures of good and bad diversity. The goal is to verify that adding diversity measures as optimization goals results in more accurate committees. Thus, the contribution of this work is to determine if the measures of good and bad diversity can be used in mono and multiobjective optimization techniques as objectives of optimization for the construction of committees of classifiers more accurate than those constructed by the same process, but using only the accuracy classification as an optimization objective. We have verified that the developed metaheuristics present better results than the classic generation techniques of committees, ie, Bagging, Boosting and Random Selection. We also verified that in the majority of metaheuristics the use of diversity measures as optimization objectives does not help to generate more accurate committees than when only the classification error, obtaining in the best scenarios non statistically different results.

Page generated in 0.0766 seconds