Package org.grouplens.lenskit

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

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        candidates.add(6);
        candidates.add(7);
        candidates.add(8);
        candidates.add(9);

        List<ScoredId> recs = recommender.recommend(1, candidates);
        assertTrue(recs.isEmpty());

        candidates.clear();
        candidates.add(9);
        recs = recommender.recommend(2, candidates);
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        List<ScoredId> recs = recommender.recommend(1, candidates);
        assertTrue(recs.isEmpty());

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

        candidates.clear();
        candidates.add(6);
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        candidates.clear();
        candidates.add(6);
        candidates.add(7);
        candidates.add(8);
        recs = recommender.recommend(2, candidates);
        assertTrue(recs.isEmpty());

        candidates.add(9);
        recs = recommender.recommend(3, candidates);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
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        candidates.add(8);
        recs = recommender.recommend(2, candidates);
        assertTrue(recs.isEmpty());

        candidates.add(9);
        recs = recommender.recommend(3, candidates);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(6L));

        recs = recommender.recommend(4, candidates);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
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        candidates.add(9);
        recs = recommender.recommend(3, candidates);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(6L));

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

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

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

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

        candidates.remove(7);
        recs = recommender.recommend(5, candidates);
        assertTrue(recs.isEmpty());

        candidates.add(7);
        recs = recommender.recommend(6, candidates);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
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        candidates.remove(7);
        recs = recommender.recommend(5, candidates);
        assertTrue(recs.isEmpty());

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

        candidates.remove(9);
        recs = recommender.recommend(6, candidates);
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        recs = recommender.recommend(6, candidates);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(6L, 7L));

        candidates.remove(9);
        recs = recommender.recommend(6, candidates);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(6L, 7L));

        candidates.remove(8);
        recs = recommender.recommend(6, candidates);
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        recs = recommender.recommend(6, candidates);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(6L, 7L));

        candidates.remove(8);
        recs = recommender.recommend(6, candidates);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(6L, 7L));

        candidates.remove(7);
        recs = recommender.recommend(6, candidates);
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