The size should not matter, you should get output, what do you exactly mean by "it has null"?
--sebastian On 02.08.2013 03:44, hahn jiang wrote: > The version of Mahout which I used is 0.7-cdh4.3.1 and I am sure that no > errors occur. I check the output but it has null. > I think the problem is my data set. > Is it too small about my item set that only 200 elements? > > > > On Thu, Aug 1, 2013 at 9:57 PM, Sebastian Schelter <[email protected]> wrote: > >> Which version of Mahout are you using? Did you check the output, are you >> sure that no errors occur? >> >> Best, >> Sebastian >> >> On 01.08.2013 09:59, hahn jiang wrote: >>> Hi all, >>> >>> >>> I have a question when I use RecommenderJob for item-based >> recommendation. >>> >>> My input data format is "userid,itemid,1", so I set booleanData option is >>> true. >>> >>> The length of users is 9,000,000 but the length of item is 200. >>> >>> >>> When I run the RecommenderJob, the result is null. I try many times use >>> different arguments. But the result is also null. >>> >>> This is one of my commands. Would you help me for tell me why it is null >>> please? >>> >>> >>> bash recommender-job.sh --input input/user-item-value --output >>> output/recommender --numRecommendations 10 --similarityClassname >>> SIMILARITY_PEARSON_CORRELATION --maxSimilaritiesPerItem 300 >>> --maxPrefsPerUser 300 --minPrefsPerUser 1 >> --maxPrefsPerUserInItemSimilarity >>> 10000000 --booleanData true >>> >>> >>> Thanks >>> >> >> >
