Clusters in the input-output problem space represent "patches" of data, which can be represented asrules. Neurons in competitive learning neural networks learn to represent centers of clusters. A weight vector wjmay be viewed as a geometrical center of a cluster of data.
These characteristic of competitive learning neural networks can be used for the purpose of rules extraction, and finding fuzzy rules in particular. Figureshows a two-dimensional input output space for learning rules of the form of IF X is A, THEN Y is B, where A and B can be defined either as intervals for extracting interval rules or as fuzzylabels for extracting fuzzy rules. This clustering can be achieved in a competitive learning neuralnetwork.
The main requirement of learning rules through clustering in competitive learning algorithms is that the training data set should include a significant number of samples.
There are some characteristics of this type of learning rules:-
After arough set of fuzzy rules is extracted, further refinement of these rules may be achieved by.
The approach presented here uses real data for training a competitive learning neural network. Fuzzyrules were then extracted based on fuzzy quantization.