Source
incanter/core.clj:2172
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(defn to-dummies [coll]
(let [cat-var (categorical-var :data coll)
levels (:levels cat-var)
encoded-data (to-levels coll :categorical-var cat-var)
bit-map (get-dummies (count levels))]
(for [item encoded-data] (nth bit-map item))))
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