That's a pure typo. I will fix that.
On Sat, Feb 27, 2010 at 6:28 PM, Claudio Martella <[email protected]> wrote: > Hi, > > > I'm gettin into mahout through the reading of Mahout in action. I'm > pretty curious about this sentence: > > [talking about item-based an user-based reccomendation systems] > > "They do have notably different properties. For instance, the running > time of an item-based > recommender scales up as the number of items increases, whereas a > user-based recommender’s > running time goes up as the number of users increases. > This suggests one reason that you might choose an item-based > recommender: if the number of users > is relatively low compared to the number of items, the performance > advantage could be significant." > > How would the item-based recommender be a good choice with a huge number > of items if the item-based recommender's cost grows with the number of > items? > > > thanks > >
