Package org.grouplens.lenskit.vectors

Examples of org.grouplens.lenskit.vectors.MutableSparseVector.norm()

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        LongSet ts = LongUtils.setUnion(vec1.keySet(),vec2.keySet());

        MutableSparseVector v1 = MutableSparseVector.create(ts);
        v1.fill(0);
        v1.set(vec1);
        v1.multiply(1.0 / v1.norm());
        v1.addScaled(vec2, -1.0 / vec2.norm());

        distance = v1.norm();
        return 1-distance;
    }
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        v1.fill(0);
        v1.set(vec1);
        v1.multiply(1.0 / v1.norm());
        v1.addScaled(vec2, -1.0 / vec2.norm());

        distance = v1.norm();
        return 1-distance;
    }

    @Override
    public boolean isSparse() {
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    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));
    }
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