Package org.grouplens.lenskit.vectors

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

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            ImmutableList.Builder<ImmutableSparseVector> nvecs = ImmutableList.builder();
            for (LongIterator uiter = domain.activeSetView().iterator(); uiter.hasNext();) {
                final long user = uiter.nextLong();
                MutableSparseVector vec = vectors.get(user);
                // save user's original vector
                ImmutableSparseVector userVector = vec.immutable();
                vecs.add(userVector);
                // normalize user vector
                normalizer.normalize(user, userVector, vec);
                // and save normalized vector
                nvecs.add(vec.immutable());
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                ImmutableSparseVector userVector = vec.immutable();
                vecs.add(userVector);
                // normalize user vector
                normalizer.normalize(user, userVector, vec);
                // and save normalized vector
                nvecs.add(vec.immutable());
                for (LongIterator iiter = userVector.keySet().iterator(); iiter.hasNext();) {
                    final long item = iiter.nextLong();
                    LongList itemUsers = itemUserLists.get(item);
                    if (itemUsers == null) {
                        itemUsers = new LongArrayList();
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        protected Neighbor computeNext() {
            while (neighborIter.hasNext()) {
                final long neighbor = neighborIter.nextLong();
                MutableSparseVector nbrRatings = getUserRatingVector(neighbor);
                if (nbrRatings != null) {
                    ImmutableSparseVector rawRatings = nbrRatings.immutable();
                    normalizer.normalize(neighbor, rawRatings, nbrRatings);
                    final double sim = similarity.similarity(user, userVector, neighbor, nbrRatings);
                    if (acceptSimilarity(sim)) {
                        // we have found a neighbor
                        return new Neighbor(neighbor, rawRatings, sim);
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    @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));
    }
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        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));
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