[MINOR] Data preparation script for recoding user/product ratings
[MINOR] Data preparation script for recoding user/product ratings

This utility script allows the conversion of user ratings in triple
representation of alphanumeric user names, alphanumeric product names,
and numeric ratings into an n x m ratings matrix where n is the number
of unique users, and m is the number of unique products. The output
ratings matrix can be directly fed into algorithm scripts such as ALS.

niketanpansare/systemml,deroneriksson/systemml,gweidner/incubator-systemml,dusenberrymw/systemml,niketanpansare/incubator-systemml,deroneriksson/systemml,apache/incubator-systemml,niketanpansare/systemml,apache/incubator-systemml,dusenberrymw/incubator-systemml,deroneriksson/systemml,dusenberrymw/incubator-systemml,dusenberrymw/incubator-systemml,gweidner/incubator-systemml,nakul02/incubator-systemml,niketanpansare/systemml,nakul02/incubator-systemml,dusenberrymw/systemml,deroneriksson/incubator-systemml,dusenberrymw/systemml,gweidner/incubator-systemml,nakul02/systemml,apache/incubator-systemml,apache/incubator-systemml,gweidner/systemml,nakul02/systemml,dusenberrymw/incubator-systemml,dusenberrymw/systemml,niketanpansare/systemml,deroneriksson/systemml,deroneriksson/systemml,niketanpansare/incubator-systemml,deroneriksson/incubator-systemml,gweidner/systemml,apache/incubator-systemml,dusenberrymw/systemml,gweidner/incubator-systemml,nakul02/incubator-systemml,gweidner/systemml,gweidner/incubator-systemml,apache/incubator-systemml,nakul02/incubator-systemml,gweidner/incubator-systemml,nakul02/systemml,nakul02/systemml,dusenberrymw/systemml,nakul02/incubator-systemml,niketanpansare/systemml,gweidner/systemml,niketanpansare/incubator-systemml,niketanpansare/incubator-systemml,deroneriksson/incubator-systemml,dusenberrymw/incubator-systemml,deroneriksson/incubator-systemml,gweidner/systemml,dusenberrymw/incubator-systemml,deroneriksson/incubator-systemml,nakul02/incubator-systemml,nakul02/systemml,gweidner/systemml,nakul02/systemml,niketanpansare/systemml,deroneriksson/systemml,deroneriksson/incubator-systemml