As far as I know, mahout would not do any post processing to remove records from recs. I assume you refer to recs as recommendation candidates. If you find some user is not in recs (the output), please make sure he/she has sufficient interactions with the items.
On Sep 16, 2014, at 10:17 AM, Wei Li <wei.le...@gmail.com> wrote: > Thanks Peng. > > Yes, I agree your points, there may not be enough interactions between > users and items to do the recommendations, but do our Mahout code does some > extra filtering to remove the recommendation candidates? > > On Mon, Sep 15, 2014 at 3:35 PM, Peng Zhang <pzhang.x...@gmail.com> wrote: > >> Mahout does not guarantee specified recs for each user. There are many >> reasons, e.g, there might not be enough similar users or items for a user. >> >> Peng Zhang >> >> -- >> Sent from my iPhone >> >>> On Sep 15, 2014, at 3:15 PM, Wei Li <wei.le...@gmail.com> wrote: >>> >>> Hi Mahout Users: >>> >>> We are using the RecommderJob to perform the item-based >>> recommendations, the following settings are used: >>> >>> similairtyClassname=SIMILARITY_COOCCURRENCE >>> numRecommendations=20 >>> other parameters are set to default values >>> >>> while we see that the size of the recommendation results for some users >> is >>> less than 20, only 1 or 2. Since we have no time to dive into the source >>> code now, we do know if we see the right parameters. Does any one can >> help >>> us on this issue? many thanks :) >>> >>> Best >>> Wei >>
