Hi, Mahout do not recommend items which are already consumed by the user. For example, In the getAllOtherItems method of GenericUserBasedRecommender class there is the following line
possibleItemIDs.removeAll(dataModel.getItemIDsFromUser(theUserID)); which removes user's items from the possibleItemIDs to prevent these items from being recommended to the user. This is ok for many recommendation cases but in my case it is not. What is the best way to change this behavior, for example I might create a new class which extends GenericUserBasedRecommender and overwrite the getAllOtherItems and remove line possibleItemIDs.removeAll(dataModel.getItemIDsFromUser(theUserID)); Thanks.
