Sean Owen wrote: > Yes, you're trying to solve a slightly simpler problem than > recommending items to users. You just want to find users similar to a > given user. > > Yes you di want the method UserBasedRecommender.mostSimilarUserIDs(). > It's implemented at the moment by GenericUserBasedRecommender and > others >
Wouldn't it be just easier and faster to directly use UserNeighborhood.getUserNeighborhood(userdID)? > An item-based recommender is based on item-item similarities, so it's > not by nature suited to answer the question, which users are similar > to a given user? It's user-based recommenders that can help you there. > > I don't think you want to swap users and items, no. > > Sean > > On Mon, Mar 1, 2010 at 9:53 PM, Steve McNewman <[email protected]> wrote: > >> Hi Mahout Community, >> I am currently playing around with the Taste and would like to get the >> following working: Given a set of users who have used a certain item, I >> would like to get a list of recommendations for the most similar users. As >> far as I understand, both user- and item-based recommender return a list of >> RecommendedItems when executing their recommend(userId, howMany) method. The >> difference between them is that user-based recommender use (weighted) >> user-similarities and item-based recommender (weighted) item-similarities, >> right? >> >> How do I get the most similar user IDs? Do I simply use the >> mostSimilarUserIDs(userId, howMany) method of the user-based recommender? >> Why can't I use an item-based recommender for this? Do I need to use a >> DataModel with swapped item and userIdColumns? In how far is the list of >> most similar User IDs related to collaborative filtering? >> > > -- Claudio Martella Digital Technologies Unit Research & Development - Analyst TIS innovation park Via Siemens 19 | Siemensstr. 19 39100 Bolzano | 39100 Bozen Tel. +39 0471 068 123 Fax +39 0471 068 129 [email protected] http://www.tis.bz.it Short information regarding use of personal data. According to Section 13 of Italian Legislative Decree no. 196 of 30 June 2003, we inform you that we process your personal data in order to fulfil contractual and fiscal obligations and also to send you information regarding our services and events. Your personal data are processed with and without electronic means and by respecting data subjects' rights, fundamental freedoms and dignity, particularly with regard to confidentiality, personal identity and the right to personal data protection. At any time and without formalities you can write an e-mail to [email protected] in order to object the processing of your personal data for the purpose of sending advertising materials and also to exercise the right to access personal data and other rights referred to in Section 7 of Decree 196/2003. The data controller is TIS Techno Innovation Alto Adige, Siemens Street n. 19, Bolzano. You can find the complete information on the web site www.tis.bz.it.
