4.8 Article

On the Accuracy-Complexity Tradeoff of Fuzzy Broad Learning System

期刊

IEEE TRANSACTIONS ON FUZZY SYSTEMS
卷 29, 期 10, 页码 2963-2974

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TFUZZ.2020.3009757

关键词

Fuzzy systems; Neural networks; Fuzzy sets; Computational modeling; Complexity theory; Takagi-Sugeno model; Training; Accuracy-complexity; classification; fuzzy broad learning system (FBLS); Takagi-Sugeno-Kang (TSK) fuzzy system

资金

  1. National Natural Science Foundation of China [61702195, 61751202, 61751205, U1813203, U1801262]
  2. National Key Research and Development Program of China [2019YFA0706200, 2019YFB1703600]
  3. Macau Science and Technology Development Fund (FDCT) [0119/2018/A3, 079/2017/A2]
  4. Foundation for DistinguishedYoung Talents in Higher Education ofGuangdong, China [2018KQNCX324]
  5. Teacher Research Capacity Promotion Program of Beijing Normal University, Zhuhai, China

向作者/读者索取更多资源

The FBLS model, while accurate in classification and regression tasks, becomes hard to interpret due to the ensemble of multiple fuzzy subsystems. The compact FBLS (CFBLS) simplifies the model for better interpretability and generates fewer and more explainable fuzzy rules.
The fuzzy broad learning system (FBLS) is a recently proposed neuro-fuzzy model that shares the similar structure of a broad learning system (BLS). It shows high accuracy in both classification and regression tasks and inherits the fast computational nature of a BLS. However, the ensemble of several fuzzy subsystems in an FBLS decreases the possibility of understanding the fuzzy model since the fuzzy rules from different fuzzy systems are difficult to combine together while keeping the consistence. To balance the model accuracy and complexity, a synthetically simplified FBLS with better interpretability, named compact FBLS (CFBLS), is developed in this article, which can generate much fewer and more explainable fuzzy rules for understanding. In such a way, only one traditional Takagi-Sugeno-Kang fuzzy system is employed in the feature layer of a CFBLS, and the input universe of discourse is equally partitioned to obtain the fuzzy sets with proper linguistic labels accordingly. The random feature selection matrix and rule combination matrix are employed to reduce the total number of fuzzy rules and to avoid the curse of dimensionality. The enhancement layer is kept in the CFBLS that helps to add a nonlinear transformation of input features to the traditional first-order polynomial used in the consequent part of a fuzzy rule. The pseudoinverse is also used to determine the parameters of CFBLS guaranteeing its fast computational nature. The experiments on the popular UCI and KEEL datasets indicate that the CFBLS can generate a smaller set of comprehensible fuzzy rules and achieve much higher accuracy than some state-of-the-art neuro-fuzzy models. Moreover, the advantage of CFBLS is also verified in a real-world application.

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