That's true, for this particular job you'd have to normalize the values to make them a valid estimate. I'd forgotten that.
2011/10/17 WangRamon <[email protected]>: > > Hi Sean > Actually, i even find something more interesting from book "Mahout in Action" > in Chapter 6 Page 72, "Note that the values in R do not represent an > estimated preference value -- they’re far too large, for > one. These could be normalized into estimated preference values with some > additional computation, if > desired. But for purposes here, normalization doesn’t matter, since the > ordering of recommendations is > the important thing, not the exact values on which the ordering depends." The > value R is the estimated result computed by running > org.apache.mahout.cf.taste.hadoop.item.RecommenderJob, can i use it directly > to do the compartion? The book says the R can be normalized into estimated > pref, i'm not sure it has been done or not by the RecommenderJob? > ThanksRamon >
