How to cluster training data before training a neural network

Hi all, I am training a neural network with Input (4x120 matrix) and Output (3x120 matrix) for patter recognition.Before training network i would like to cluster the data.What procedure can be followed ? After clustering how to train a network with clustered output ? Thank you in advance

Answer 1

[Shashank Prasanna]

Could you explain further? There are a number of ways to cluster your data:

Statistics Toolbox:

http://www.mathworks.com/help/stats/unsupervised-learning.html

Neural Network Toolbox:

http://www.mathworks.com/help/nnet/ug/cluster-with-self-organizing-map-neural-network.html

[Greg Heath]

In general, don't put too much faith in unsupervised clustering to directly train a classifier.

However, unsupervised clustering can be a useful tool for initializing a supervised clustering classifier. A competing method of initialization is to use individual unsupervised clustering for each class.

Most of all, the visualization of clustering results are very helpful for understanding classifier performance.

Answer 2

[Image Analyst]

You might try Brett Shoelson's (of the Mathworks) app: http://www.mathworks.com/matlabcentral/fileexchange/35014-clusterdata