Examples of ItemScorer

Examples of org.grouplens.lenskit.ItemScorer

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    public void testAddScoreVector() {
        MutableSparseVector uv = MutableSparseVector.create(2, 3, 5);
        uv.set(2, 3);
        uv.set(3, 4);
        uv.set(5, 2);
        ItemScorer scorer = PrecomputedItemScorer.newBuilder()
                                          .addUser(3, uv)
                                          .build();
        MutableSparseVector output = MutableSparseVector.create(2, 3, 4, 5);
        scorer.score(3, output);
        assertThat(output, equalTo(uv));
    }
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Examples of org.grouplens.lenskit.ItemScorer

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        assertThat(v.values(), everyItem(equalTo(5.0)));
    }

    @Test
    public void testScoreVector() {
        ItemScorer pred = new ConstantItemScorer(5);
        MutableSparseVector v = MutableSparseVector.create(1, 2, 3, 5, 7);
        pred.score(42, v);
        assertThat(v.keySet(), contains(1L, 2L, 3L, 5L, 7L));
        assertThat(v.values(), everyItem(equalTo(5.0)));
    }
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Examples of org.grouplens.lenskit.ItemScorer

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              .to(FunkSVDUpdateRule.class);

        LenskitRecommenderEngine engine = LenskitRecommenderEngine.build(config);

        LenskitRecommender rec = engine.createRecommender();
        ItemScorer scorer = rec.getItemScorer();
        assertThat(scorer, instanceOf(FunkSVDItemScorer.class));
        FunkSVDItemScorer fsvd = (FunkSVDItemScorer) scorer;
        assertThat(fsvd.getUpdateRule(),
                   not(nullValue()));
    }
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