Kostas is a simple K-nearest Neighbour classifier for an arbitrary count of numerical features.
Pass your data to classify in the following format.
(def data [{:label "Foo" :features [1 2 3]}
{:label "Bar" :features [3 4 2]}])
(def to-classify [1 2 2])
(classify to-classify data 3)
The label for the matched classification will be returned.