Clojure for Data Science

Inspect the data

The ratings files are tab-separated, containing the field's user ID, item ID, rating, and timestamp. The user ID links to a row in the u.user file, which provides basic demographic information such as age, sex, and occupation:

(defn ex-7-1 []
  (->> (io/resource "ua.base")
       (io/reader)
       (line-seq)
       (first)))

;; "1\t1\t5\t874965758"

The string shows a single line from the file—a tab-separated line containing the user ID, item ID, rating (1-5), and timestamp showing when the rating was made. The rating is an integer from 1 to 5 and the timestamp is given as the number of seconds since January 1, 1970. The item ID links to a row in the u.item file.

We'll also want to load the u.item file, so we can determine the names of the items being ...