Package org.grouplens.lenskit

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

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

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

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

        candidates.remove(6);
        recs = recommender.recommend(6, candidates);
        assertTrue(recs.isEmpty());
    }

    /**
     * Tests {@code recommend(long, SparseVector, int, Set, Set)}.
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        ItemRecommender recommender = rec.getItemRecommender();
        assert recommender != null;

        LongOpenHashSet candidates = new LongOpenHashSet();
        candidates.add(9);
        List<ScoredId> recs = recommender.recommend(2, -1, candidates, null);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(9L));

        recs = recommender.recommend(2, 1, candidates, null);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
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        candidates.add(9);
        List<ScoredId> recs = recommender.recommend(2, -1, candidates, null);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(9L));

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

        recs = recommender.recommend(2, 0, candidates, null);
        assertTrue(recs.isEmpty());
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        recs = recommender.recommend(2, 1, candidates, null);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(9L));

        recs = recommender.recommend(2, 0, candidates, null);
        assertTrue(recs.isEmpty());

        LongOpenHashSet exclude = new LongOpenHashSet();
        exclude.add(9);
        recs = recommender.recommend(2, -1, candidates, exclude);
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        recs = recommender.recommend(2, 0, candidates, null);
        assertTrue(recs.isEmpty());

        LongOpenHashSet exclude = new LongOpenHashSet();
        exclude.add(9);
        recs = recommender.recommend(2, -1, candidates, exclude);
        assertTrue(recs.isEmpty());

        // FIXME Add tests for default exclude set
        recs = recommender.recommend(5, -1, null, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
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        exclude.add(9);
        recs = recommender.recommend(2, -1, candidates, exclude);
        assertTrue(recs.isEmpty());

        // FIXME Add tests for default exclude set
        recs = recommender.recommend(5, -1, null, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   contains(9L, 7L, 6L, 8L));

        recs = recommender.recommend(5, 5, null, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
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        // FIXME Add tests for default exclude set
        recs = recommender.recommend(5, -1, null, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   contains(9L, 7L, 6L, 8L));

        recs = recommender.recommend(5, 5, null, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   contains(9L, 7L, 6L, 8L));

        recs = recommender.recommend(5, 4, null, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
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        recs = recommender.recommend(5, 5, null, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   contains(9L, 7L, 6L, 8L));

        recs = recommender.recommend(5, 4, null, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   contains(9L, 7L, 6L, 8L));

        recs = recommender.recommend(5, 3, null, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
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        recs = recommender.recommend(5, 4, null, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   contains(9L, 7L, 6L, 8L));

        recs = recommender.recommend(5, 3, null, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   contains(9L, 7L, 6L));

        recs = recommender.recommend(5, 2, null, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
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