Rewrite fuzzy_kmeans by using built-ins only.
Merge remote-tracking branch 'upstream/master'
Add power API
Merge remote-tracking branch 'upstream/master'
Rewrite k-means by using builtins only.
Comment unused code.
Keep the code to be an example of abuse of shuffle.
Merge pull request #198 from fegin/master

Rewrite fuzzy_kmeans by using built-ins only.