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New Structural Evolving Algorithms For Fuzzy Systems

Recently, the issue of accuracy and interpretability trade-off has been getting more attention when designing new fuzzy systems. In this thesis, three evolving fuzzy models, namely enhancement of fuzzy term identification (EFTI), structure identification method (SIM) and structural evolving approach...

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Main Author:	Saad, Hisham Haider Yusef
Format:	Thesis
Language:	English
Published:	2018
Subjects:	T Technology (General) TK1-9971 Electrical engineering. Electronics. Nuclear engineering
Online Access:	http://eprints.usm.my/47437/1/New%20Structural%20Evolving%20Algorithms%20For%20Fuzzy%20Systems.pdf http://eprints.usm.my/47437/
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spelling	my.usm.eprints.47437 http://eprints.usm.my/47437/ New Structural Evolving Algorithms For Fuzzy Systems Saad, Hisham Haider Yusef T Technology (General) TK1-9971 Electrical engineering. Electronics. Nuclear engineering Recently, the issue of accuracy and interpretability trade-off has been getting more attention when designing new fuzzy systems. In this thesis, three evolving fuzzy models, namely enhancement of fuzzy term identification (EFTI), structure identification method (SIM) and structural evolving approach (SEA) are proposed to spot the best trade-off between accuracy and interpretability. EFTI, SIM and SEA are designed based on error reducing methods. EFTI is developed to fit with single input single output (SISO) problems (i.e. one dimension), while SIM and SEA are developed to fit with multi input single output (MISO) (medium and high dimension). EFTI begins with a simple fuzzy structure that is composed of two fuzzy terms in the input space. Then EFTI continues evolving by identifying splitting points of the input space that are compatible with the consequent parameters. On the other hand, SIM and SEA start with one fuzzy rule that has no fuzzy term in the input space regardless of the degree level of input dimension. Then they evolve on the basis of either closure or split processes for the selected input attribute of the selected subregion. If the selected attribute has no fuzzy terms, closure is performed, otherwise split is done. The evolving continues until a satisfactory accuracy is fulfilled or maximum number of subregion is reached. A partitioning technique based on the similarity feature and a static partition-selection technique are developed for SIM. While, a partitioning technique based on splitting the selected subregion into two subregions with maximum and minimum average error and a dynamic partition-selection technique are developed for SEA. Furthermore, a pruning technique based on the importance level of the fuzzy rules is proposed to shrink the rule-base of SEA. Compared with SISO models and using three datasets, EFTI produces the lowest RMSE with lowest number of rules. For MISO models and using nine benchmark datasets, SIM achieves the lowest RMSE with the smallest size of rule-base systems. Similarly, for MISO state-of-the-art models and using six benchmark datasets, SEA also produces the lowest RMSE with the smallest size of rule-base systems. In conclusion, the results proved that EFTI, SIM and SEA are able to produce a significant trade-off between accuracy and interpretability 2018-09-01 Thesis NonPeerReviewed application/pdf en http://eprints.usm.my/47437/1/New%20Structural%20Evolving%20Algorithms%20For%20Fuzzy%20Systems.pdf Saad, Hisham Haider Yusef (2018) New Structural Evolving Algorithms For Fuzzy Systems. PhD thesis, Universiti Sains Malaysia.
institution	Universiti Sains Malaysia
building	Hamzah Sendut Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Sains Malaysia
content_source	USM Institutional Repository
url_provider	http://eprints.usm.my/
language	English
topic	T Technology (General) TK1-9971 Electrical engineering. Electronics. Nuclear engineering
spellingShingle	T Technology (General) TK1-9971 Electrical engineering. Electronics. Nuclear engineering Saad, Hisham Haider Yusef New Structural Evolving Algorithms For Fuzzy Systems
description	Recently, the issue of accuracy and interpretability trade-off has been getting more attention when designing new fuzzy systems. In this thesis, three evolving fuzzy models, namely enhancement of fuzzy term identification (EFTI), structure identification method (SIM) and structural evolving approach (SEA) are proposed to spot the best trade-off between accuracy and interpretability. EFTI, SIM and SEA are designed based on error reducing methods. EFTI is developed to fit with single input single output (SISO) problems (i.e. one dimension), while SIM and SEA are developed to fit with multi input single output (MISO) (medium and high dimension). EFTI begins with a simple fuzzy structure that is composed of two fuzzy terms in the input space. Then EFTI continues evolving by identifying splitting points of the input space that are compatible with the consequent parameters. On the other hand, SIM and SEA start with one fuzzy rule that has no fuzzy term in the input space regardless of the degree level of input dimension. Then they evolve on the basis of either closure or split processes for the selected input attribute of the selected subregion. If the selected attribute has no fuzzy terms, closure is performed, otherwise split is done. The evolving continues until a satisfactory accuracy is fulfilled or maximum number of subregion is reached. A partitioning technique based on the similarity feature and a static partition-selection technique are developed for SIM. While, a partitioning technique based on splitting the selected subregion into two subregions with maximum and minimum average error and a dynamic partition-selection technique are developed for SEA. Furthermore, a pruning technique based on the importance level of the fuzzy rules is proposed to shrink the rule-base of SEA. Compared with SISO models and using three datasets, EFTI produces the lowest RMSE with lowest number of rules. For MISO models and using nine benchmark datasets, SIM achieves the lowest RMSE with the smallest size of rule-base systems. Similarly, for MISO state-of-the-art models and using six benchmark datasets, SEA also produces the lowest RMSE with the smallest size of rule-base systems. In conclusion, the results proved that EFTI, SIM and SEA are able to produce a significant trade-off between accuracy and interpretability
format	Thesis
author	Saad, Hisham Haider Yusef
author_facet	Saad, Hisham Haider Yusef
author_sort	Saad, Hisham Haider Yusef
title	New Structural Evolving Algorithms For Fuzzy Systems
title_short	New Structural Evolving Algorithms For Fuzzy Systems
title_full	New Structural Evolving Algorithms For Fuzzy Systems
title_fullStr	New Structural Evolving Algorithms For Fuzzy Systems
title_full_unstemmed	New Structural Evolving Algorithms For Fuzzy Systems
title_sort	new structural evolving algorithms for fuzzy systems
publishDate	2018
url	http://eprints.usm.my/47437/1/New%20Structural%20Evolving%20Algorithms%20For%20Fuzzy%20Systems.pdf http://eprints.usm.my/47437/
_version_	1717094493043294208
score	13.211869

New Structural Evolving Algorithms For Fuzzy Systems

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