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Sean Owen commented on MAHOUT-925: ---------------------------------- This is fine, though, don't you want to count like so? if (numRecommendedItems > 0) { reach++; } Otherwise it seems like you're just counting all users, except the ones that the *test framework* couldn't test due to sampling size, which is something else and something you want to ignore in general. (So actually I think I'd count both reach and the number of users that the test framework succeeded for). Is that about right for you? > Evaluate the reach of recommender algorithms > -------------------------------------------- > > Key: MAHOUT-925 > URL: https://issues.apache.org/jira/browse/MAHOUT-925 > Project: Mahout > Issue Type: Improvement > Components: Collaborative Filtering > Affects Versions: 0.5 > Reporter: Anatoliy Kats > Assignee: Sean Owen > Priority: Minor > Attachments: MAHOUT-925.patch > > Original Estimate: 1h > Remaining Estimate: 1h > > The evaluation of a CF algorithm should include reach, the proportion of > users for whom a recommendation could be made. An algorithm usually has a > cutoff value on the confidence of the recommender, and if it is not high > enough, no recommendation is made. The number of requested recommendations, > or this parameter could be varied as part of the evaluation. The proposed > patch adds this. > My build with this patch breaks > testMapper(org.apache.mahout.classifier.df.mapreduce.partial.Step1MapperTest): > org.apache.mahout.classifier.df.node.Leaf.<init>(I)V . The test seems > unrelated to the patch, so I am assuming this is broken in the trunk head as > well. Unfortunately I am under a deadline, and I do not have time to write > tests for the patch. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira