Add missing ns docstring

src/metabase/fingerprinting/comparison.clj

@@ -6,7 +6,7 @@
              [fingerprinters :as fingerprinters]
              [histogram :as h]]
             [redux.core :as redux])
-  (import com.bigml.histogram.Histogram))
+  (:import com.bigml.histogram.Histogram))
 
 (def magnitude
   "Transducer that claclulates magnitude (Euclidean norm) of given vector.

src/metabase/fingerprinting/histogram.clj

 (ns metabase.fingerprinting.histogram
-  ""
+  "Wrappers and additional functionality for `bigml.histogram`."
   (:require [bigml.histogram.core :as impl]
             [kixi.stats.math :as math]
             [redux.core :as redux])
-  (import com.bigml.histogram.Histogram))
+  (:import com.bigml.histogram.Histogram))
 
 (defn histogram
   "Transducer that summarizes numerical data with a histogram."