“…There are various methods of improving the performance of fuzzy systems, from introducing weights of the fuzzy rules (see, e.g., Ishibuchi and Nakashima, 2001), through reducing the number of the fuzzy rules (see, e.g., Cpalka, 2017), to optimizing a fuzzy system, usually by modifying fuzzy set parameters (see, e.g., Jin, 2000) or rule consolidation (see, e.g., Riid and Preden, 2017) and using the collaborative fuzzy clustering (see, e.g., Prasad et al, 2017).…”