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Fuzzy Syst."],"published-print":{"date-parts":[[2020,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>This paper proposes two methods for training Takagi\u2013Sugeno (T-S) fuzzy systems using batch least squares (BLS) and particle swarm optimization (PSO). The T-S system is considered with triangular and Gaussian membership functions in the antecedents and higher-order polynomials in the consequents of fuzzy rules. In the first method, the BLS determines the polynomials in a system in which the fuzzy sets are known. In the second method, the PSO algorithm determines the fuzzy sets, whereas the BLS determines the polynomials. In this paper, the ridge regression is used to stabilize the solution when the problem is close to the singularity. Thanks to this, the proposed methods can be applied when the number of observations is less than the number of predictors. Moreover, the leave-one-out cross-validation is used to avoid overfitting and this way to choose the structure of a fuzzy model. A method of obtaining piecewise linear regression by means of the zero-order T-S system is also presented.<\/jats:p>","DOI":"10.1007\/s40815-019-00747-2","type":"journal-article","created":{"date-parts":[[2019,11,14]],"date-time":"2019-11-14T22:01:31Z","timestamp":1573768891000},"page":"22-34","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":20,"title":["Training High-Order Takagi-Sugeno Fuzzy Systems Using Batch Least Squares and Particle Swarm Optimization"],"prefix":"10.1007","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8711-1659","authenticated-orcid":false,"given":"Krzysztof","family":"Wiktorowicz","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7359-4637","authenticated-orcid":false,"given":"Tomasz","family":"Krzeszowski","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2019,11,14]]},"reference":[{"issue":"10","key":"747_CR1","doi-asserted-by":"publisher","first-page":"12312","DOI":"10.1016\/j.eswa.2011.04.009","volume":"38","author":"A Alfi","year":"2011","unstructured":"Alfi, A., Fateh, M.M.: Intelligent identification and control using improved fuzzy particle swarm optimization. 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