?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Scale+And+Translation+Invariant+Collaborative+Filtering+Systems&rft.creator=Lemire%2C+Daniel&rft.subject=Machine+Learning&rft.description=Collaborative+filtering+systems+are+prediction+algorithms+over+sparse+data+sets+of+user+preferences.+We+modify+a+wide+range+of+state-of-the-art+collaborative+filtering+systems+to+make+them+scale+and+translation+invariant+and+generally+improve+their+accuracy+without+increasing+their+computational+cost.+Using+the+EachMovie+and+the+Jester+data+sets%2C+we+show+that+learning-free+constant+time+scale+and+translation+invariant+schemes+outperforms+other+learning-free+constant+time+schemes+by+at+least+3%25+and+perform+as+well+as+expensive+memory-based+schemes+(within+4%25).+Over+the+Jester+data+set%2C+we+show+that+a+scale+and+translation+invariant+Eigentaste+algorithm+outperforms+Eigentaste+2.0+by+20%25.+These+results+suggest+that+scale+and+translation+invariance+is+a+desirable+property.+&rft.publisher=Kluwer&rft.date=2004&rft.type=Journal+(On-line%2FUnpaginated)&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Fcogprints.org%2F3451%2F1%2Fsti_nrc.pdf&rft.identifier=++Lemire%2C+Daniel++(2004)+Scale+And+Translation+Invariant+Collaborative+Filtering+Systems.++%5BJournal+(On-line%2FUnpaginated)%5D++++(In+Press)++&rft.relation=http%3A%2F%2Fcogprints.org%2F3451%2F