Diversity-based case base maintenance

Three algorithms are proposed for maintaining a case base. Different from other algorithms that have been proposed for updating a case base, the diversity of cases (relative to each other) plays an important role in these new algorithms. Specifically, these algorithms combine similarity and diversity of cases together for determining a new case base. Experimental results demonstrate that these algorithms can greatly reduce the size of a case base without comprising its competence, especially for the algorithm based on evolution strategies (ESs).