On the suitability of the Bandler-Kohout subproduct as an inference mechanism

Authors:
Martin Štěpnička;Balasubramaniam Jayaram
Affiliations:
Institute for Research and Applications of Fuzzy Modeling, University of Ostrava, Ostrava, Czech Republic;Department of Mathematics, Indian Institute of Technology Hyderabad, Hyderabad, India
Venue:
IEEE Transactions on Fuzzy Systems
Year:
2010

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Abstract

Fuzzy relational inference (FRI) systems form an important part of approximate reasoning schemes using fuzzy sets. The compositional rule of inference (CRI), which was introduced by Zadeh, has attracted the most attention so far. In this paper, we show that the FRI scheme that is based on the Bandler-Kohout (BK) subproduct, along with a suitable realization of the fuzzy rules, possesses all the important properties that are cited in favor of using CRI, viz., equivalent and reasonable conditions for their solvability, their interpolative properties, and the preservation of the indistinguishability that may be inherent in the input fuzzy sets. Moreover, we show that under certain conditions, the equivalence of first-infer-then-aggregate (FITA) and first-aggregate-then-infer (FATI) inference strategies can be shown for the BK subproduct, much like in the case of CRI. Finally, by addressing the computational complexity that may exist in the BK subproduct, we suggest a hierarchical inferencing scheme. Thus, this paper shows that the BK-subproduct-based FRI is as effective and efficient as the CRI itself.