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The fuzzy system is considered with Gaussian fuzzy sets in the antecedents and high-order polynomials in the consequents of fuzzy rules. The fuzzy sets can be chosen manually or determined by a metaheuristic optimization method (particle swarm optimization, genetic algorithm or simulated annealing), while the polynomials are obtained using ordinary least squares, ridge regression or sparse regressions (forward selection, least angle regression, least absolute shrinkage and selection operator, and elastic net regression). A quality criterion is proposed that expresses a compromise between the prediction ability of the fuzzy model and its sparsity. The conducted experiments showed that: (a) the use of sparse regressions and\/or metaheuristic optimization can reduce the validation error compared with the reference method, and (b) the use of sparse regressions may simplify the fuzzy model by zeroing some of the coefficients.<\/jats:p>","DOI":"10.1007\/s00500-020-05238-3","type":"journal-article","created":{"date-parts":[[2020,9,5]],"date-time":"2020-09-05T06:02:52Z","timestamp":1599285772000},"page":"15113-15127","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Approximation of two-variable functions using high-order Takagi\u2013Sugeno fuzzy systems, sparse regressions, and metaheuristic optimization"],"prefix":"10.1007","volume":"24","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":[[2020,9,5]]},"reference":[{"key":"5238_CR1","doi-asserted-by":"publisher","first-page":"21","DOI":"10.1016\/J.INS.2016.03.047","volume":"360","author":"M Almaraashi","year":"2016","unstructured":"Almaraashi M, John R, Hopgood A, Ahmadi S (2016) Learning of interval and general type-2 fuzzy logic systems using simulated annealing: Theory and practice. 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