Package org.grouplens.lenskit.vectors

Examples of org.grouplens.lenskit.vectors.MutableSparseVector

87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
     * @param offset  An offset to subtract from each value prior to averaging.
     * @param damping The damping term (see {@link #idMeanOffsets(double)}).
     * @return The vector of means.
     */
    public ImmutableSparseVector computeIdMeans(double offset, double damping) {
        MutableSparseVector v = MutableSparseVector.create(sums);
        for (VectorEntry e: v) {
            final int n = counts.get(e.getKey());
            // if n <= 0, how did we get this item?
            assert n > 0;
            // compute a total to subtract offset from each accumulated value
            final double noff = n * offset;
            v.set(e, (e.getValue() - noff) / (n + damping));
        }
        return v.freeze();
    }
View Full Code Here
41
42
43
44
45
46
47
48
49
50
51
52
53
54
        keySet = LongUtils.packedSet(1, 3, 4, 6);
    }

    @Test
    public void testScale() {
        MutableSparseVector v = MutableSparseVector.create(keySet);
        v.set(1, 1);
        v.set(4, 1);
        assertThat(norm.normalize(v.immutable(), v), sameInstance(v));
        assertThat(v.norm(), closeTo(1, 1.0e-6));
        assertThat(v.size(), equalTo(2));
        assertThat(v.get(1), closeTo(1 / sqrt(2), 1.0e-6));
        assertThat(v.get(4), closeTo(1 / sqrt(2), 1.0e-6));
    }
View Full Code Here
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
        assertThat(v.get(4), closeTo(1 / sqrt(2), 1.0e-6));
    }

    @Test
    public void testScaleOther() {
        MutableSparseVector v = MutableSparseVector.create(keySet);
        v.set(1, 1);
        v.set(4, 1);
        MutableSparseVector ref = MutableSparseVector.create(keySet);
        ref.set(1, 1);
        ref.set(6, 1);
        ref.set(3, 2);

        VectorTransformation tx = norm.makeTransformation(ref.immutable());
        assertThat(tx.apply(v), sameInstance(v));
        assertThat(v.norm(), closeTo(sqrt(2.0 / 6), 1.0e-6));
        assertThat(v.size(), equalTo(2));
        assertThat(v.get(1), closeTo(1 / sqrt(6), 1.0e-6));
        assertThat(v.get(4), closeTo(1 / sqrt(6), 1.0e-6));
View Full Code Here
33
34
35
36
37
38
39
40
41
42
public class MeanCenteringVectorNormalizerTest {
    VectorNormalizer norm = new MeanCenteringVectorNormalizer();

    @Test
    public void testEmptyReference() {
        MutableSparseVector msv = MutableSparseVector.create(4L);
        msv.set(4, 3.5);
        norm.normalize(SparseVector.empty(), msv);
        assertThat(msv.get(4), closeTo(3.5, 1.0e-5));
    }
View Full Code Here
41
42
43
44
45
46
47
48
49
50
        assertThat(msv.get(4), closeTo(3.5, 1.0e-5));
    }

    @Test
    public void testSameReference() {
        MutableSparseVector msv = MutableSparseVector.create(4L);
        msv.set(4, 3.5);
        norm.normalize(msv, msv);
        assertThat(msv.get(4), closeTo(0, 1.0e-5));
    }
View Full Code Here
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
        assertThat(msv.get(4), closeTo(0, 1.0e-5));
    }

    @Test
    public void testTransform() {
        MutableSparseVector reference = MutableSparseVector.create(4L, 5L);
        reference.set(4, 3.5);
        reference.set(5, 2.5);
        VectorTransformation tx = norm.makeTransformation(reference);

        MutableSparseVector msv = reference.mutableCopy();
        tx.apply(msv);
        assertThat(msv.get(4), closeTo(0.5, 1.0e-5));
        assertThat(msv.get(5), closeTo(-0.5, 1.0e-5));

        msv.set(4, 2);
        tx.unapply(msv);
        assertThat(msv.get(4), closeTo(5, 1.0e-5));
    }
View Full Code Here
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
    @Test
    public void testMakeTransformation() {
        MeanVarianceNormalizer urvn;
        urvn = new MeanVarianceNormalizer();
        VectorTransformation trans = urvn.makeTransformation(userRatings);
        MutableSparseVector nUR = userRatings.mutableCopy();
        final double mean = 2.0;
        final double stdev = Math.sqrt(8.0 / 3.0);
        trans.apply(nUR);
        //Test apply
        Assert.assertEquals((0.0 - mean) / stdev, nUR.get(0L), MIN_DOUBLE_PRECISION);
        Assert.assertEquals((2.0 - mean) / stdev, nUR.get(1L), MIN_DOUBLE_PRECISION);
        Assert.assertEquals((4.0 - mean) / stdev, nUR.get(2L), MIN_DOUBLE_PRECISION);
        trans.unapply(nUR);
        //Test unapply
        Assert.assertEquals(0.0, nUR.get(0L), MIN_DOUBLE_PRECISION);
        Assert.assertEquals(2.0, nUR.get(1L), MIN_DOUBLE_PRECISION);
        Assert.assertEquals(4.0, nUR.get(2L), MIN_DOUBLE_PRECISION);
    }
View Full Code Here
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
    @Test
    public void testUniformRatings() {
        MeanVarianceNormalizer urvn;
        urvn = new MeanVarianceNormalizer();
        VectorTransformation trans = urvn.makeTransformation(uniformUserRatings);
        MutableSparseVector nUR = userRatings.mutableCopy();
        trans.apply(nUR);
        //Test apply
        Assert.assertEquals(0.0, nUR.get(0L), MIN_DOUBLE_PRECISION);
        Assert.assertEquals(0.0, nUR.get(1L), MIN_DOUBLE_PRECISION);
        Assert.assertEquals(0.0, nUR.get(2L), MIN_DOUBLE_PRECISION);
        trans.unapply(nUR);
        //Test unapply
        Assert.assertEquals(2.0, nUR.get(0L), MIN_DOUBLE_PRECISION);
        Assert.assertEquals(2.0, nUR.get(1L), MIN_DOUBLE_PRECISION);
        Assert.assertEquals(2.0, nUR.get(2L), MIN_DOUBLE_PRECISION);
    }
View Full Code Here
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
    @Test
    public void testSmoothingDetailed() {
        MeanVarianceNormalizer urvn = new MeanVarianceNormalizer.Builder(dao, 3.0).get();

        VectorTransformation trans = urvn.makeTransformation(userRatings);
        MutableSparseVector nUR = userRatings.mutableCopy();
        final double mean = 2.0;
        final double stdev = Math.sqrt(7.0 / 3.0);
        trans.apply(nUR);
        //Test apply
        Assert.assertEquals((0.0 - mean) / stdev, nUR.get(0L), MIN_DOUBLE_PRECISION);
        Assert.assertEquals((2.0 - mean) / stdev, nUR.get(1L), MIN_DOUBLE_PRECISION);
        Assert.assertEquals((4.0 - mean) / stdev, nUR.get(2L), MIN_DOUBLE_PRECISION);
        trans.unapply(nUR);
        //Test unapply
        Assert.assertEquals(0.0, nUR.get(0L), MIN_DOUBLE_PRECISION);
        Assert.assertEquals(2.0, nUR.get(1L), MIN_DOUBLE_PRECISION);
        Assert.assertEquals(4.0, nUR.get(2L), MIN_DOUBLE_PRECISION);
    }
View Full Code Here
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
    private final Symbol bazSym = Symbol.of("baz");
    private final TypedSymbol<String> tsym = TypedSymbol.of(String.class, "test.wombat");
   
    @Test
    public void testSparseVectorScoredIds() {
        MutableSparseVector sv = MutableSparseVector.create(LongUtils.packedSet(1,2,4));
        sv.set(1,1.0);
        sv.set(4,16.0);
       
        MutableSparseVector foo = sv.addChannelVector(fooSym);
        foo.set(1,2.0);
        foo.set(4,5.0);
       
        MutableSparseVector bar = sv.addChannelVector(barSym);
        bar.set(1,3.0);
       
        MutableSparseVector baz = sv.addChannelVector(bazSym);
        baz.set(2, 100.0);

        Long2ObjectMap<String> wombat = sv.addChannel(tsym);
        wombat.put(1, "hello");
        wombat.put(4, "goodbye");
       
View Full Code Here
TOP

Related Classes of org.grouplens.lenskit.vectors.MutableSparseVector

  • org.grouplens.lenskit.baseline.ConstantItemScorerTest
  • org.grouplens.lenskit.baseline.FallbackItemScorer
  • org.grouplens.lenskit.baseline.FallbackItemScorerTest
  • org.grouplens.lenskit.baseline.LeastSquaresItemScorer$Builder
  • org.grouplens.lenskit.baseline.LeastSquaresItemScorerTest
  • org.grouplens.lenskit.baseline.UserMeanItemScorer
  • org.grouplens.lenskit.basic.AbstractGlobalItemScorer
  • org.grouplens.lenskit.basic.AbstractItemScorer
  • org.grouplens.lenskit.basic.AbstractRatingPredictor
  • org.grouplens.lenskit.basic.PrecomputedItemScorerTest
    • Copyright © 2018 www.massapicom. All rights reserved.
    All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.