Examples with SplitNode org.apache.ignite.ml.trees.nodes.SplitNode used on opensource projects

Example 1 with SplitNode

use of org.apache.ignite.ml.trees.nodes.SplitNode in project ignite by apache.

the class ColumnDecisionTreeTrainer method doTrain.

/**
 */
@NotNull
private DecisionTreeModel doTrain(ColumnDecisionTreeTrainerInput input, UUID uuid) {
    RootNode root = new RootNode();
    // List containing setters of leaves of the tree.
    List<TreeTip> tips = new LinkedList<>();
    tips.add(new TreeTip(root::setSplit, 0));
    int curDepth = 0;
    int regsCnt = 1;
    int featuresCnt = input.featuresCount();
    IntStream.range(0, featuresCnt).mapToObj(fIdx -> SplitCache.key(fIdx, input.affinityKey(fIdx, ignite), uuid)).forEach(k -> SplitCache.getOrCreate(ignite).put(k, new IgniteBiTuple<>(0, 0.0)));
    updateSplitCache(0, regsCnt, featuresCnt, ig -> i -> input.affinityKey(i, ig), uuid);
    // regions cannot be split more and split only those that can.
    while (true) {
        long before = System.currentTimeMillis();
        IgniteBiTuple<Integer, IgniteBiTuple<Integer, Double>> b = findBestSplitIndexForFeatures(featuresCnt, input::affinityKey, uuid);
        long findBestRegIdx = System.currentTimeMillis() - before;
        Integer bestFeatureIdx = b.get1();
        Integer regIdx = b.get2().get1();
        Double bestInfoGain = b.get2().get2();
        if (regIdx >= 0 && bestInfoGain > MIN_INFO_GAIN) {
            before = System.currentTimeMillis();
            SplitInfo bi = ignite.compute().affinityCall(ProjectionsCache.CACHE_NAME, input.affinityKey(bestFeatureIdx, ignite), () -> {
                TrainingContext<ContinuousRegionInfo> ctx = ContextCache.getOrCreate(ignite).get(uuid);
                Ignite ignite = Ignition.localIgnite();
                RegionKey key = ProjectionsCache.key(bestFeatureIdx, regIdx / BLOCK_SIZE, input.affinityKey(bestFeatureIdx, Ignition.localIgnite()), uuid);
                RegionProjection reg = ProjectionsCache.getOrCreate(ignite).localPeek(key).get(regIdx % BLOCK_SIZE);
                return ctx.featureProcessor(bestFeatureIdx).findBestSplit(reg, ctx.values(bestFeatureIdx, ignite), ctx.labels(), regIdx);
            });
            long findBestSplit = System.currentTimeMillis() - before;
            IndexAndSplitInfo best = new IndexAndSplitInfo(bestFeatureIdx, bi);
            regsCnt++;
            if (log.isDebugEnabled())
                log.debug("Globally best: " + best.info + " idx time: " + findBestRegIdx + ", calculate best: " + findBestSplit + " fi: " + best.featureIdx + ", regs: " + regsCnt);
            // Request bitset for split region.
            int ind = best.info.regionIndex();
            SparseBitSet bs = ignite.compute().affinityCall(ProjectionsCache.CACHE_NAME, input.affinityKey(bestFeatureIdx, ignite), () -> {
                Ignite ignite = Ignition.localIgnite();
                IgniteCache<FeatureKey, double[]> featuresCache = FeaturesCache.getOrCreate(ignite);
                IgniteCache<UUID, TrainingContext<D>> ctxCache = ContextCache.getOrCreate(ignite);
                TrainingContext ctx = ctxCache.localPeek(uuid);
                double[] values = featuresCache.localPeek(getFeatureCacheKey(bestFeatureIdx, uuid, input.affinityKey(bestFeatureIdx, Ignition.localIgnite())));
                RegionKey key = ProjectionsCache.key(bestFeatureIdx, regIdx / BLOCK_SIZE, input.affinityKey(bestFeatureIdx, Ignition.localIgnite()), uuid);
                RegionProjection reg = ProjectionsCache.getOrCreate(ignite).localPeek(key).get(regIdx % BLOCK_SIZE);
                return ctx.featureProcessor(bestFeatureIdx).calculateOwnershipBitSet(reg, values, best.info);
            });
            SplitNode sn = best.info.createSplitNode(best.featureIdx);
            TreeTip tipToSplit = tips.get(ind);
            tipToSplit.leafSetter.accept(sn);
            tipToSplit.leafSetter = sn::setLeft;
            int d = tipToSplit.depth++;
            tips.add(new TreeTip(sn::setRight, d));
            if (d > curDepth) {
                curDepth = d;
                if (log.isDebugEnabled()) {
                    log.debug("Depth: " + curDepth);
                    log.debug("Cache size: " + prjsCache.size(CachePeekMode.PRIMARY));
                }
            }
            before = System.currentTimeMillis();
            // Perform split on all feature vectors.
            IgniteSupplier<Set<RegionKey>> bestRegsKeys = () -> IntStream.range(0, featuresCnt).mapToObj(fIdx -> ProjectionsCache.key(fIdx, ind / BLOCK_SIZE, input.affinityKey(fIdx, Ignition.localIgnite()), uuid)).collect(Collectors.toSet());
            int rc = regsCnt;
            // Perform split.
            CacheUtils.update(prjsCache.getName(), ignite, (Ignite ign, Cache.Entry<RegionKey, List<RegionProjection>> e) -> {
                RegionKey k = e.getKey();
                List<RegionProjection> leftBlock = e.getValue();
                int fIdx = k.featureIdx();
                int idxInBlock = ind % BLOCK_SIZE;
                IgniteCache<UUID, TrainingContext<D>> ctxCache = ContextCache.getOrCreate(ign);
                TrainingContext<D> ctx = ctxCache.get(uuid);
                RegionProjection targetRegProj = leftBlock.get(idxInBlock);
                IgniteBiTuple<RegionProjection, RegionProjection> regs = ctx.performSplit(input, bs, fIdx, best.featureIdx, targetRegProj, best.info.leftData(), best.info.rightData(), ign);
                RegionProjection left = regs.get1();
                RegionProjection right = regs.get2();
                leftBlock.set(idxInBlock, left);
                RegionKey rightKey = ProjectionsCache.key(fIdx, (rc - 1) / BLOCK_SIZE, input.affinityKey(fIdx, ign), uuid);
                IgniteCache<RegionKey, List<RegionProjection>> c = ProjectionsCache.getOrCreate(ign);
                List<RegionProjection> rightBlock = rightKey.equals(k) ? leftBlock : c.localPeek(rightKey);
                if (rightBlock == null) {
                    List<RegionProjection> newBlock = new ArrayList<>(BLOCK_SIZE);
                    newBlock.add(right);
                    return Stream.of(new CacheEntryImpl<>(k, leftBlock), new CacheEntryImpl<>(rightKey, newBlock));
                } else {
                    rightBlock.add(right);
                    return rightBlock.equals(k) ? Stream.of(new CacheEntryImpl<>(k, leftBlock)) : Stream.of(new CacheEntryImpl<>(k, leftBlock), new CacheEntryImpl<>(rightKey, rightBlock));
                }
            }, bestRegsKeys);
            if (log.isDebugEnabled())
                log.debug("Update of projections cache time: " + (System.currentTimeMillis() - before));
            before = System.currentTimeMillis();
            updateSplitCache(ind, rc, featuresCnt, ig -> i -> input.affinityKey(i, ig), uuid);
            if (log.isDebugEnabled())
                log.debug("Update of split cache time: " + (System.currentTimeMillis() - before));
        } else {
            if (log.isDebugEnabled())
                log.debug("Best split [bestFeatureIdx=" + bestFeatureIdx + ", bestInfoGain=" + bestInfoGain + "]");
            break;
        }
    }
    int rc = regsCnt;
    IgniteSupplier<Iterable<Cache.Entry<RegionKey, List<RegionProjection>>>> featZeroRegs = () -> {
        IgniteCache<RegionKey, List<RegionProjection>> projsCache = ProjectionsCache.getOrCreate(Ignition.localIgnite());
        return () -> IntStream.range(0, (rc - 1) / BLOCK_SIZE + 1).mapToObj(rBIdx -> ProjectionsCache.key(0, rBIdx, input.affinityKey(0, Ignition.localIgnite()), uuid)).map(k -> (Cache.Entry<RegionKey, List<RegionProjection>>) new CacheEntryImpl<>(k, projsCache.localPeek(k))).iterator();
    };
    Map<Integer, Double> vals = CacheUtils.reduce(prjsCache.getName(), ignite, (TrainingContext ctx, Cache.Entry<RegionKey, List<RegionProjection>> e, Map<Integer, Double> m) -> {
        int regBlockIdx = e.getKey().regionBlockIndex();
        if (e.getValue() != null) {
            for (int i = 0; i < e.getValue().size(); i++) {
                int regIdx = regBlockIdx * BLOCK_SIZE + i;
                RegionProjection reg = e.getValue().get(i);
                Double res = regCalc.apply(Arrays.stream(reg.sampleIndexes()).mapToDouble(s -> ctx.labels()[s]));
                m.put(regIdx, res);
            }
        }
        return m;
    }, () -> ContextCache.getOrCreate(Ignition.localIgnite()).get(uuid), featZeroRegs, (infos, infos2) -> {
        Map<Integer, Double> res = new HashMap<>();
        res.putAll(infos);
        res.putAll(infos2);
        return res;
    }, HashMap::new);
    int i = 0;
    for (TreeTip tip : tips) {
        tip.leafSetter.accept(new Leaf(vals.get(i)));
        i++;
    }
    ProjectionsCache.clear(featuresCnt, rc, input::affinityKey, uuid, ignite);
    ContextCache.getOrCreate(ignite).remove(uuid);
    FeaturesCache.clear(featuresCnt, input::affinityKey, uuid, ignite);
    SplitCache.clear(featuresCnt, input::affinityKey, uuid, ignite);
    return new DecisionTreeModel(root.s);
}