Package org.grouplens.lenskit

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

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        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()),
                   contains(9L, 7L));

        recs = recommender.recommend(5, 1, null, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
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        recs = recommender.recommend(5, 2, null, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   contains(9L, 7L));

        recs = recommender.recommend(5, 1, null, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   contains(9L));

        recs = recommender.recommend(5, 0, null, LongSets.EMPTY_SET);
        assertTrue(recs.isEmpty());
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        recs = recommender.recommend(5, 1, null, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   contains(9L));

        recs = recommender.recommend(5, 0, null, LongSets.EMPTY_SET);
        assertTrue(recs.isEmpty());

        candidates.clear();
        candidates.add(6);
        candidates.add(7);
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        assertTrue(recs.isEmpty());

        candidates.clear();
        candidates.add(6);
        candidates.add(7);
        recs = recommender.recommend(6, -1, candidates, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(6L, 7L));

        candidates.remove(6);
        recs = recommender.recommend(6, -1, candidates, LongSets.EMPTY_SET);
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        recs = recommender.recommend(6, -1, candidates, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   containsInAnyOrder(6L, 7L));

        candidates.remove(6);
        recs = recommender.recommend(6, -1, candidates, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   contains(7L));

        candidates.remove(7);
        recs = recommender.recommend(6, -1, candidates, LongSets.EMPTY_SET);
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        recs = recommender.recommend(6, -1, candidates, LongSets.EMPTY_SET);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   contains(7L));

        candidates.remove(7);
        recs = recommender.recommend(6, -1, candidates, LongSets.EMPTY_SET);
        assertTrue(recs.isEmpty());

        candidates.add(6);
        candidates.add(7);
        exclude.add(6);
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        assertTrue(recs.isEmpty());

        candidates.add(6);
        candidates.add(7);
        exclude.add(6);
        recs = recommender.recommend(6, -1, candidates, exclude);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   contains(7L));

        exclude.add(7);
        recs = recommender.recommend(6, -1, candidates, exclude);
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        recs = recommender.recommend(6, -1, candidates, exclude);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   contains(7L));

        exclude.add(7);
        recs = recommender.recommend(6, -1, candidates, exclude);
        assertTrue(recs.isEmpty());

        exclude.remove(6);
        recs = recommender.recommend(6, -1, candidates, exclude);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
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        exclude.add(7);
        recs = recommender.recommend(6, -1, candidates, exclude);
        assertTrue(recs.isEmpty());

        exclude.remove(6);
        recs = recommender.recommend(6, -1, candidates, exclude);
        assertThat(Lists.transform(recs, ScoredIds.idFunction()),
                   contains(6L));
    }
}
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