Package org.grouplens.lenskit

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

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                                                       .build());
        ItemScorer predictor = LenskitRecommenderEngine.build(config)
                                                       .createRecommender()
                                                       .getItemScorer();

        assertEquals(7 / 3.0, predictor.score(2, 9), EPSILON);
        assertEquals(13 / 3.0, predictor.score(3, 6), EPSILON);
        assertEquals(2, predictor.score(4, 6), EPSILON);
        assertEquals(2, predictor.score(4, 9), EPSILON);
        assertEquals(2.5, predictor.score(5, 6), EPSILON);
        assertEquals(3, predictor.score(5, 7), EPSILON);
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        ItemScorer predictor = LenskitRecommenderEngine.build(config)
                                                       .createRecommender()
                                                       .getItemScorer();

        assertEquals(7 / 3.0, predictor.score(2, 9), EPSILON);
        assertEquals(13 / 3.0, predictor.score(3, 6), EPSILON);
        assertEquals(2, predictor.score(4, 6), EPSILON);
        assertEquals(2, predictor.score(4, 9), EPSILON);
        assertEquals(2.5, predictor.score(5, 6), EPSILON);
        assertEquals(3, predictor.score(5, 7), EPSILON);
        assertEquals(3.5, predictor.score(5, 9), EPSILON);
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                                                       .createRecommender()
                                                       .getItemScorer();

        assertEquals(7 / 3.0, predictor.score(2, 9), EPSILON);
        assertEquals(13 / 3.0, predictor.score(3, 6), EPSILON);
        assertEquals(2, predictor.score(4, 6), EPSILON);
        assertEquals(2, predictor.score(4, 9), EPSILON);
        assertEquals(2.5, predictor.score(5, 6), EPSILON);
        assertEquals(3, predictor.score(5, 7), EPSILON);
        assertEquals(3.5, predictor.score(5, 9), EPSILON);
        assertEquals(1.5, predictor.score(6, 6), EPSILON);
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                                                       .getItemScorer();

        assertEquals(7 / 3.0, predictor.score(2, 9), EPSILON);
        assertEquals(13 / 3.0, predictor.score(3, 6), EPSILON);
        assertEquals(2, predictor.score(4, 6), EPSILON);
        assertEquals(2, predictor.score(4, 9), EPSILON);
        assertEquals(2.5, predictor.score(5, 6), EPSILON);
        assertEquals(3, predictor.score(5, 7), EPSILON);
        assertEquals(3.5, predictor.score(5, 9), EPSILON);
        assertEquals(1.5, predictor.score(6, 6), EPSILON);
        assertEquals(2, predictor.score(6, 7), EPSILON);
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        assertEquals(7 / 3.0, predictor.score(2, 9), EPSILON);
        assertEquals(13 / 3.0, predictor.score(3, 6), EPSILON);
        assertEquals(2, predictor.score(4, 6), EPSILON);
        assertEquals(2, predictor.score(4, 9), EPSILON);
        assertEquals(2.5, predictor.score(5, 6), EPSILON);
        assertEquals(3, predictor.score(5, 7), EPSILON);
        assertEquals(3.5, predictor.score(5, 9), EPSILON);
        assertEquals(1.5, predictor.score(6, 6), EPSILON);
        assertEquals(2, predictor.score(6, 7), EPSILON);
        assertEquals(2.5, predictor.score(6, 9), EPSILON);
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        assertEquals(7 / 3.0, predictor.score(2, 9), EPSILON);
        assertEquals(13 / 3.0, predictor.score(3, 6), EPSILON);
        assertEquals(2, predictor.score(4, 6), EPSILON);
        assertEquals(2, predictor.score(4, 9), EPSILON);
        assertEquals(2.5, predictor.score(5, 6), EPSILON);
        assertEquals(3, predictor.score(5, 7), EPSILON);
        assertEquals(3.5, predictor.score(5, 9), EPSILON);
        assertEquals(1.5, predictor.score(6, 6), EPSILON);
        assertEquals(2, predictor.score(6, 7), EPSILON);
        assertEquals(2.5, predictor.score(6, 9), EPSILON);
    }
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        assertEquals(13 / 3.0, predictor.score(3, 6), EPSILON);
        assertEquals(2, predictor.score(4, 6), EPSILON);
        assertEquals(2, predictor.score(4, 9), EPSILON);
        assertEquals(2.5, predictor.score(5, 6), EPSILON);
        assertEquals(3, predictor.score(5, 7), EPSILON);
        assertEquals(3.5, predictor.score(5, 9), EPSILON);
        assertEquals(1.5, predictor.score(6, 6), EPSILON);
        assertEquals(2, predictor.score(6, 7), EPSILON);
        assertEquals(2.5, predictor.score(6, 9), EPSILON);
    }
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        assertEquals(2, predictor.score(4, 6), EPSILON);
        assertEquals(2, predictor.score(4, 9), EPSILON);
        assertEquals(2.5, predictor.score(5, 6), EPSILON);
        assertEquals(3, predictor.score(5, 7), EPSILON);
        assertEquals(3.5, predictor.score(5, 9), EPSILON);
        assertEquals(1.5, predictor.score(6, 6), EPSILON);
        assertEquals(2, predictor.score(6, 7), EPSILON);
        assertEquals(2.5, predictor.score(6, 9), EPSILON);
    }

    @Test
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        assertEquals(2, predictor.score(4, 9), EPSILON);
        assertEquals(2.5, predictor.score(5, 6), EPSILON);
        assertEquals(3, predictor.score(5, 7), EPSILON);
        assertEquals(3.5, predictor.score(5, 9), EPSILON);
        assertEquals(1.5, predictor.score(6, 6), EPSILON);
        assertEquals(2, predictor.score(6, 7), EPSILON);
        assertEquals(2.5, predictor.score(6, 9), EPSILON);
    }

    @Test
    public void testPredict2() throws RecommenderBuildException {
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        assertEquals(2.5, predictor.score(5, 6), EPSILON);
        assertEquals(3, predictor.score(5, 7), EPSILON);
        assertEquals(3.5, predictor.score(5, 9), EPSILON);
        assertEquals(1.5, predictor.score(6, 6), EPSILON);
        assertEquals(2, predictor.score(6, 7), EPSILON);
        assertEquals(2.5, predictor.score(6, 9), EPSILON);
    }

    @Test
    public void testPredict2() throws RecommenderBuildException {
        List<Rating> rs = new ArrayList<Rating>();
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