Dunn index for clusters analysis

This is a Python implementation of the Dunn index, which is used to evaluate clustering results. While, officially, I followed the reference below, unnoficially, Wikipedia was a lot more helpful in this endeavour.

I also want to thank the people who used the code and commented in the GitHub gist where the code below is hosted. I received many bug reports and useful suggestions.

Kovács, F.; Legány, C. & Babos, A. Cluster Validity Measurement Techniques. 6th International Symposium of Hungarian Researchers on Computational Intelligence, 2005.

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