Package org.grouplens.lenskit.vectors

Examples of org.grouplens.lenskit.vectors.ImmutableSparseVector

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    @Override
    public Iterable<Neighbor> getCandidateNeighbors(UserHistory<? extends Event> user, LongSet items) {
        final long uid = user.getUserId();
        SparseVector urs = summarizer.summarize(user);
        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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    @Override
    public Iterable<Neighbor> getCandidateNeighbors(UserHistory<? extends Event> user, LongSet items) {
        final long uid = user.getUserId();
        SparseVector urs = RatingVectorUserHistorySummarizer.makeRatingVector(user);
        final ImmutableSparseVector nratings = normalizer.normalize(user.getUserId(), urs, null)
                                                   .freeze();
        final LongSet candidates = findCandidateNeighbors(uid, nratings, items);
        logger.debug("found {} candidate neighbors for {}", candidates.size(), uid);
        return new Iterable<Neighbor>() {
            @Override
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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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            this.damping = damping;
        }

        @Override
        public ItemMeanRatingItemScorer get() {
            final ImmutableSparseVector itemMeans;
            final double globalMean;

            logger.debug("computing item mean ratings");
            Cursor<Rating> ratings = dao.streamEvents(Rating.class);
            try {
                IdMeanAccumulator accum = new IdMeanAccumulator();
                for (Rating r: ratings) {
                    Preference p = r.getPreference();
                    if (p != null) {
                        accum.put(p.getItemId(), p.getValue());
                    }
                }
                globalMean = accum.globalMean();
                itemMeans = accum.idMeanOffsets(damping);
            } finally {
                ratings.close();
            }
            logger.debug("computed means for {} items", itemMeans.size());
            logger.debug("global mean rating is {}", globalMean);

            return new ItemMeanRatingItemScorer(itemMeans, globalMean, damping);
        }
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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());
                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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Related Classes of org.grouplens.lenskit.vectors.ImmutableSparseVector

  • it.unimi.dsi.fastutil.longs.LongSortedSet
  • org.grouplens.lenskit.baseline.ItemMeanRatingItemScorer$Builder
  • org.grouplens.lenskit.collections.LongKeyDomain
  • org.grouplens.lenskit.knn.user.LiveNeighborFinder
  • org.grouplens.lenskit.knn.user.LiveNeighborFinder$NeighborIterator
  • org.grouplens.lenskit.knn.user.SnapshotNeighborFinder
  • org.grouplens.lenskit.knn.user.UserSnapshot$Builder
  • org.grouplens.lenskit.symbols.TypedSymbol
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