Package org.grouplens.lenskit.vectors

Examples of org.grouplens.lenskit.vectors.ImmutableSparseVector.keySet()

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        final ImmutableSparseVector vector = normalizer.normalize(user.getUserId(), urs, null)
                                                 .freeze();

        LongCollection qset = items;
        if (vector.size() < qset.size()) {
            qset = vector.keySet();
        }
        final LongSet candidates = new LongOpenHashSet();
        for (LongIterator iter = qset.iterator(); iter.hasNext();) {
            final long item = iter.nextLong();
            LongSet users = snapshot.getItemUsers(item);
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                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();
                        itemUserLists.put(item, itemUsers);
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