Code works with Jester data set, which is not included in this distribution but is downloadable from
http://eigentaste.berkeley.edu/dataset/

Note that the code here works on data set 1, after being converted to CSV format.

Data set originated from:

Eigentaste: A Constant Time Collaborative Filtering Algorithm.
 Ken Goldberg, Theresa Roeder, Dhruv Gupta, and Chris Perkins.
 Information Retrieval, 4(2), 133-151. July 2001.