Affiliation:
1. Zunyi Normal University, China
2. Nanchang Hangkong University, China
Abstract
By introducing the cost measure and three-way decisions theory into the multi-granulation spaces, the uncertain knowledge is approximately described, and the selection method of cost-sensitive optimal knowledge space is proposed. To choose the optimal cost knowledge space to describe a fuzzy concept, a sequential three-way decisions model with rough fuzzy sets (S3WDRFS) is established. It is found that decision cost in multi-granulation knowledge spaces will monotonically decrease with finer knowledge spaces. A selection method of cost-sensitive optimal knowledge space for approximating a fuzzy concept is achieved.