Package org.grouplens.lenskit.data.dao

Examples of org.grouplens.lenskit.data.dao.PrefetchingUserEventDAO$UserProfileScanner

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        rs.add(Ratings.make(42, 7, 2));
        rs.add(Ratings.make(42, 8, 3));
        rs.add(Ratings.make(42, 9, 1));

        dao = new EventCollectionDAO(rs);
        userDAO = new PrefetchingUserEventDAO(dao);
        qtz = new ValueArrayQuantizer(new double[]{1.0, 2.0, 3.0});

    }
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    }

    @Test
    public void testUserMeanBaseline() {
        ItemScorer mean = makeGlobalMean();
        ItemScorer pred = new UserMeanItemScorer(new PrefetchingUserEventDAO(dao),
                                                 mean, new RatingVectorUserHistorySummarizer(),
                                                 0);
        // unseen item
        assertThat(pred.score(8, 4), closeTo(4.5, 0.001));
        // seen item - should be same avg
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     * Test falling back to an empty user.
     */
    @Test
    public void testUserMeanBaselineFallback() {
        ItemScorer mean = makeGlobalMean();
        ItemScorer pred = new UserMeanItemScorer(new PrefetchingUserEventDAO(dao),
                                                 mean, new RatingVectorUserHistorySummarizer(),
                                                 0);
        // unseen user - should be global mean
        assertThat(pred.score(10, 10), closeTo(RATINGS_DAT_MEAN, 0.001));
    }
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    }

    @Test
    public void testUserItemMeanBaseline() {
        ItemScorer base = new ItemMeanRatingItemScorer.Builder(dao, 0.0).get();
        ItemScorer pred = new UserMeanItemScorer(new PrefetchingUserEventDAO(dao),
                                                 base, new RatingVectorUserHistorySummarizer(),
                                                 0);
        // we use user 8 - their average offset is 0.5
        // unseen item, should be global mean + user offset
        assertThat(pred.score(8, 10),
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Related Classes of org.grouplens.lenskit.data.dao.PrefetchingUserEventDAO$UserProfileScanner

  • org.grouplens.lenskit.baseline.MeanScorersTest
  • org.grouplens.lenskit.predict.ordrec.OrdRecRatingPredictorTest
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