Package org.grouplens.lenskit

Examples of org.grouplens.lenskit.ItemRecommender.recommend()

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            if (irec == null) {
                return Optional.absent();
            }
            LongSet candidates = key.candidates.select(LenskitTestUser.this);
            LongSet excludes = key.exclude.select(LenskitTestUser.this);
            return Optional.of(irec.recommend(getUserId(), key.listSize, candidates, excludes));
        }
    }
}
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     */
    @Test
    public void testUserUserRecommender1() {
        ItemRecommender recommender = rec.getItemRecommender();
        assert recommender != null;
        List<ScoredId> recs = recommender.recommend(1);
        assertTrue(recs.isEmpty());

        recs = recommender.recommend(2);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(9L));
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        ItemRecommender recommender = rec.getItemRecommender();
        assert recommender != null;
        List<ScoredId> recs = recommender.recommend(1);
        assertTrue(recs.isEmpty());

        recs = recommender.recommend(2);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(9L));

        recs = recommender.recommend(3);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
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        recs = recommender.recommend(2);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(9L));

        recs = recommender.recommend(3);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(6L));

        recs = recommender.recommend(4);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
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        recs = recommender.recommend(3);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(6L));

        recs = recommender.recommend(4);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(9L));

        recs = recommender.recommend(5);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
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        recs = recommender.recommend(4);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(9L));

        recs = recommender.recommend(5);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(7L));

        recs = recommender.recommend(6);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
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        recs = recommender.recommend(5);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(7L));

        recs = recommender.recommend(6);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(6L, 7L));
    }

    /**
 
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     */
    @Test
    public void testUserUserRecommender2() {
        ItemRecommender recommender = rec.getItemRecommender();
        assert recommender != null;
        List<ScoredId> recs = recommender.recommend(1, -1);
        assertTrue(recs.isEmpty());

        recs = recommender.recommend(2, 2);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(9L));
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        ItemRecommender recommender = rec.getItemRecommender();
        assert recommender != null;
        List<ScoredId> recs = recommender.recommend(1, -1);
        assertTrue(recs.isEmpty());

        recs = recommender.recommend(2, 2);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(9L));

        recs = recommender.recommend(2, -1);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
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        recs = recommender.recommend(2, 2);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(9L));

        recs = recommender.recommend(2, -1);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(9L));

        recs = recommender.recommend(2, 1);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
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