Hidden knowledge is very important in data mining field. Large data set have many hidden pattern which have very crucial information, clustering is such technique which find the hidden pattern from the large data. Artificial neural network is very powerful tool in machine learning or in the field of computer visions. Competitive learning is used for clustering in neural network. Example of competitive learning, SOM and ART are famous for clustering. SOM have the limitation of dimension, ART is good but computation cost is very high.