Package org.grouplens.lenskit

Examples of org.grouplens.lenskit.ItemScorer.score()

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    @Test
    public void testAddScore() {
        ItemScorer scorer = PrecomputedItemScorer.newBuilder()
                                          .addScore(42, 1, 4)
                                          .build();
        assertThat(scorer.score(42, 1),
                   closeTo(4, 1.0e-5));
        assertThat(scorer.score(42, 2), notANumber());
        assertThat(scorer.score(39, 1), notANumber());
    }
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        ItemScorer scorer = PrecomputedItemScorer.newBuilder()
                                          .addScore(42, 1, 4)
                                          .build();
        assertThat(scorer.score(42, 1),
                   closeTo(4, 1.0e-5));
        assertThat(scorer.score(42, 2), notANumber());
        assertThat(scorer.score(39, 1), notANumber());
    }

    @Test
    public void testVectorScore() {
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                                          .addScore(42, 1, 4)
                                          .build();
        assertThat(scorer.score(42, 1),
                   closeTo(4, 1.0e-5));
        assertThat(scorer.score(42, 2), notANumber());
        assertThat(scorer.score(39, 1), notANumber());
    }

    @Test
    public void testVectorScore() {
        ItemScorer scorer = PrecomputedItemScorer.newBuilder()
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    public void testVectorScore() {
        ItemScorer scorer = PrecomputedItemScorer.newBuilder()
                                          .addScore(42, 1, 4)
                                          .build();
        MutableSparseVector msv = MutableSparseVector.create(1, 3);
        scorer.score(42, msv);
        assertThat(msv.containsKey(1), equalTo(true));
        assertThat(msv.containsKey(3), equalTo(false));
        assertThat(msv.get(1), closeTo(4, 1.0e-5));
    }
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public class ConstantItemScorerTest {

    @Test
    public void testSingleScore() {
        ItemScorer pred = new ConstantItemScorer(5);
        assertThat(pred.score(5, 10), equalTo(5.0));
    }

    @Test
    public void testScoreSet() {
        ItemScorer pred = new ConstantItemScorer(5);
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        ItemScorer scorer = PrecomputedItemScorer.newBuilder()
                                          .addScore(42, 3, 4)
                                          .addScore(42, 7, 2)
                                          .build();
        MutableSparseVector msv = MutableSparseVector.create(1, 3, 5, 7, 8);
        scorer.score(42, msv);
        assertThat(msv.keySet().size(), equalTo(2));
        assertThat(msv.containsKey(1), equalTo(false));
        assertThat(msv.containsKey(3), equalTo(true));
        assertThat(msv.containsKey(5), equalTo(false));
        assertThat(msv.containsKey(7), equalTo(true));
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        assertThat(msv.containsKey(7), equalTo(true));
        assertThat(msv.containsKey(8), equalTo(false));
        assertThat(msv.get(3), closeTo(4, 1.0e-5));
        assertThat(msv.get(7), closeTo(2, 1.0e-5));

        scorer.score(5, msv);
        assertThat(msv.keySet().isEmpty(), equalTo(true));
    }

    @Test
    public void testAddScoreVector() {
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    }

    @Test
    public void testScoreSet() {
        ItemScorer pred = new ConstantItemScorer(5);
        SparseVector v = pred.score(42, LongUtils.packedSet(1, 2, 3, 5, 7));
        assertThat(v.keySet(), contains(1L, 2L, 3L, 5L, 7L));
        assertThat(v.values(), everyItem(equalTo(5.0)));
    }

    @Test
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        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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    @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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