Hybrid multi-granulation rough sets of variable precision based on tolerance

Hybrid multi-granularity approach is a data processing mode in rough set theory. Taking the incomplete information system as the research object, variable precision rough set method and hybrid multi granulation rough set method are fused. And this paper proposes a hybrid multi-granulation rough sets based on variable precision tolerance relations. Basic properties of hybrid multi-granularity rough set of variable precision are discussed, which provides a new approach to deal with the incomplete information system.