| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.datasketches.kll; |
| |
| import static java.lang.Math.max; |
| import static java.lang.Math.min; |
| import static org.apache.datasketches.kll.KllPreambleUtil.getMemoryUpdatableFormatFlag; |
| import static org.apache.datasketches.kll.KllSketch.Error.MUST_NOT_BE_UPDATABLE_FORMAT; |
| import static org.apache.datasketches.kll.KllSketch.Error.TGT_IS_READ_ONLY; |
| import static org.apache.datasketches.kll.KllSketch.Error.kllSketchThrow; |
| import static org.apache.datasketches.kll.KllSketch.SketchType.FLOATS_SKETCH; |
| import static org.apache.datasketches.quantilescommon.QuantilesUtil.THROWS_EMPTY; |
| import static org.apache.datasketches.quantilescommon.QuantilesUtil.equallyWeightedRanks; |
| |
| import java.util.Objects; |
| |
| import org.apache.datasketches.common.SuppressFBWarnings; |
| import org.apache.datasketches.memory.Memory; |
| import org.apache.datasketches.memory.MemoryRequestServer; |
| import org.apache.datasketches.memory.WritableMemory; |
| import org.apache.datasketches.quantilescommon.FloatsSortedView; |
| import org.apache.datasketches.quantilescommon.QuantileSearchCriteria; |
| import org.apache.datasketches.quantilescommon.QuantilesFloatsAPI; |
| import org.apache.datasketches.quantilescommon.QuantilesFloatsSketchIterator; |
| |
| /** |
| * This variation of the KllSketch implements primitive floats. |
| * |
| * @see org.apache.datasketches.kll.KllSketch |
| */ |
| public abstract class KllFloatsSketch extends KllSketch implements QuantilesFloatsAPI { |
| private KllFloatsSketchSortedView kllFloatsSV = null; |
| |
| KllFloatsSketch(final WritableMemory wmem, final MemoryRequestServer memReqSvr) { |
| super(SketchType.FLOATS_SKETCH, wmem, memReqSvr); |
| } |
| |
| /** |
| * Factory heapify takes a compact sketch image in Memory and instantiates an on-heap sketch. |
| * The resulting sketch will not retain any link to the source Memory. |
| * @param srcMem a compact Memory image of a sketch serialized by this sketch. |
| * <a href="{@docRoot}/resources/dictionary.html#mem">See Memory</a> |
| * @return a heap-based sketch based on the given Memory. |
| */ |
| public static KllFloatsSketch heapify(final Memory srcMem) { |
| Objects.requireNonNull(srcMem, "Parameter 'srcMem' must not be null"); |
| if (getMemoryUpdatableFormatFlag(srcMem)) { Error.kllSketchThrow(MUST_NOT_BE_UPDATABLE_FORMAT); } |
| return KllHeapFloatsSketch.heapifyImpl(srcMem); |
| } |
| |
| /** |
| * Create a new direct instance of this sketch with a given <em>k</em>. |
| * @param k parameter that controls size of the sketch and accuracy of estimates. |
| * @param dstMem the given destination WritableMemory object for use by the sketch |
| * @param memReqSvr the given MemoryRequestServer to request a larger WritableMemory |
| * @return a new direct instance of this sketch |
| */ |
| public static KllFloatsSketch newDirectInstance( |
| final int k, |
| final WritableMemory dstMem, |
| final MemoryRequestServer memReqSvr) { |
| Objects.requireNonNull(dstMem, "Parameter 'dstMem' must not be null"); |
| Objects.requireNonNull(memReqSvr, "Parameter 'memReqSvr' must not be null"); |
| return KllDirectFloatsSketch.newDirectInstance(k, DEFAULT_M, dstMem, memReqSvr); |
| } |
| |
| /** |
| * Create a new direct instance of this sketch with the default <em>k</em>. |
| * The default <em>k</em> = 200 results in a normalized rank error of about |
| * 1.65%. Larger <em>k</em> will have smaller error but the sketch will be larger (and slower). |
| * @param dstMem the given destination WritableMemory object for use by the sketch |
| * @param memReqSvr the given MemoryRequestServer to request a larger WritableMemory |
| * @return a new direct instance of this sketch |
| */ |
| public static KllFloatsSketch newDirectInstance( |
| final WritableMemory dstMem, |
| final MemoryRequestServer memReqSvr) { |
| Objects.requireNonNull(dstMem, "Parameter 'dstMem' must not be null"); |
| Objects.requireNonNull(memReqSvr, "Parameter 'memReqSvr' must not be null"); |
| return KllDirectFloatsSketch.newDirectInstance(DEFAULT_K, DEFAULT_M, dstMem, memReqSvr); |
| } |
| |
| /** |
| * Create a new heap instance of this sketch with the default <em>k = 200</em>. |
| * The default <em>k</em> = 200 results in a normalized rank error of about |
| * 1.65%. Larger K will have smaller error but the sketch will be larger (and slower). |
| * This will have a rank error of about 1.65%. |
| * @return new KllFloatsSketch on the heap. |
| */ |
| public static KllFloatsSketch newHeapInstance() { |
| return new KllHeapFloatsSketch(DEFAULT_K, DEFAULT_M); |
| } |
| |
| /** |
| * Create a new heap instance of this sketch with a given parameter <em>k</em>. |
| * <em>k</em> can be between DEFAULT_M and 65535, inclusive. |
| * The default <em>k</em> = 200 results in a normalized rank error of about |
| * 1.65%. Larger K will have smaller error but the sketch will be larger (and slower). |
| * @param k parameter that controls size of the sketch and accuracy of estimates. |
| * @return new KllFloatsSketch on the heap. |
| */ |
| public static KllFloatsSketch newHeapInstance(final int k) { |
| return new KllHeapFloatsSketch(k, DEFAULT_M); |
| } |
| |
| /** |
| * Wrap a sketch around the given read only compact source Memory containing sketch data |
| * that originated from this sketch. |
| * @param srcMem the read only source Memory |
| * @return instance of this sketch |
| */ |
| public static KllFloatsSketch wrap(final Memory srcMem) { |
| Objects.requireNonNull(srcMem, "Parameter 'srcMem' must not be null"); |
| final KllMemoryValidate memVal = new KllMemoryValidate(srcMem, FLOATS_SKETCH); |
| if (memVal.updatableMemFormat) { |
| return new KllDirectFloatsSketch((WritableMemory) srcMem, null, memVal); |
| } else { |
| return new KllDirectCompactFloatsSketch(srcMem, memVal); |
| } |
| } |
| |
| /** |
| * Wrap a sketch around the given source Writable Memory containing sketch data |
| * that originated from this sketch. |
| * @param srcMem a WritableMemory that contains data. |
| * @param memReqSvr the given MemoryRequestServer to request a larger WritableMemory |
| * @return instance of this sketch |
| */ |
| public static KllFloatsSketch writableWrap( |
| final WritableMemory srcMem, |
| final MemoryRequestServer memReqSvr) { |
| Objects.requireNonNull(srcMem, "Parameter 'srcMem' must not be null"); |
| final KllMemoryValidate memVal = new KllMemoryValidate(srcMem, FLOATS_SKETCH); |
| if (memVal.updatableMemFormat) { |
| if (!memVal.readOnly) { |
| Objects.requireNonNull(memReqSvr, "Parameter 'memReqSvr' must not be null"); |
| } |
| return new KllDirectFloatsSketch(srcMem, memReqSvr, memVal); |
| } else { |
| return new KllDirectCompactFloatsSketch(srcMem, memVal); |
| } |
| } |
| |
| /** |
| * Returns upper bound on the serialized size of a KllFloatsSketch given the following parameters. |
| * @param k parameter that controls size of the sketch and accuracy of estimates |
| * @param n stream length |
| * @param updatableMemoryFormat true if updatable Memory format, otherwise the standard compact format. |
| * @return upper bound on the serialized size of a KllSketch. |
| */ |
| public static int getMaxSerializedSizeBytes(final int k, final long n, final boolean updatableMemoryFormat) { |
| return getMaxSerializedSizeBytes(k, n, SketchType.FLOATS_SKETCH, updatableMemoryFormat); |
| } |
| |
| @Override |
| public double[] getCDF(final float[] splitPoints, final QuantileSearchCriteria searchCrit) { |
| if (isEmpty()) { throw new IllegalArgumentException(THROWS_EMPTY); } |
| refreshSortedView(); |
| return kllFloatsSV.getCDF(splitPoints, searchCrit); |
| } |
| |
| @Override |
| public float getMaxItem() { |
| if (isEmpty()) { throw new IllegalArgumentException(THROWS_EMPTY); } |
| return getMaxFloatItem(); |
| } |
| |
| @Override |
| public float getMinItem() { |
| if (isEmpty()) { throw new IllegalArgumentException(THROWS_EMPTY); } |
| return getMinFloatItem(); |
| } |
| |
| @Override |
| public FloatsPartitionBoundaries getPartitionBoundaries(final int numEquallyWeighted, |
| final QuantileSearchCriteria searchCrit) { |
| if (isEmpty()) { throw new IllegalArgumentException(THROWS_EMPTY); } |
| final double[] ranks = equallyWeightedRanks(numEquallyWeighted); |
| final float[] boundaries = getQuantiles(ranks, searchCrit); |
| boundaries[0] = getMinItem(); |
| boundaries[boundaries.length - 1] = getMaxItem(); |
| final FloatsPartitionBoundaries fpb = new FloatsPartitionBoundaries(); |
| fpb.N = this.getN(); |
| fpb.ranks = ranks; |
| fpb.boundaries = boundaries; |
| return fpb; |
| } |
| |
| @Override |
| public double[] getPMF(final float[] splitPoints, final QuantileSearchCriteria searchCrit) { |
| if (isEmpty()) { throw new IllegalArgumentException(THROWS_EMPTY); } |
| refreshSortedView(); |
| return kllFloatsSV.getPMF(splitPoints, searchCrit); |
| } |
| |
| @Override |
| public float getQuantile(final double rank, final QuantileSearchCriteria searchCrit) { |
| if (isEmpty()) { throw new IllegalArgumentException(THROWS_EMPTY); } |
| refreshSortedView(); |
| return kllFloatsSV.getQuantile(rank, searchCrit); |
| } |
| |
| @Override |
| public float[] getQuantiles(final double[] ranks, final QuantileSearchCriteria searchCrit) { |
| if (isEmpty()) { throw new IllegalArgumentException(THROWS_EMPTY); } |
| refreshSortedView(); |
| final int len = ranks.length; |
| final float[] quantiles = new float[len]; |
| for (int i = 0; i < len; i++) { |
| quantiles[i] = kllFloatsSV.getQuantile(ranks[i], searchCrit); |
| } |
| return quantiles; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * The approximate probability that the true quantile is within the confidence interval |
| * specified by the upper and lower quantile bounds for this sketch is 0.99. |
| */ |
| @Override |
| public float getQuantileLowerBound(final double rank) { |
| return getQuantile(max(0, rank - KllHelper.getNormalizedRankError(getMinK(), false))); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * The approximate probability that the true quantile is within the confidence interval |
| * specified by the upper and lower quantile bounds for this sketch is 0.99. |
| */ |
| @Override |
| public float getQuantileUpperBound(final double rank) { |
| return getQuantile(min(1.0, rank + KllHelper.getNormalizedRankError(getMinK(), false))); |
| } |
| |
| @Override |
| public double getRank(final float quantile, final QuantileSearchCriteria searchCrit) { |
| if (isEmpty()) { throw new IllegalArgumentException(THROWS_EMPTY); } |
| refreshSortedView(); |
| return kllFloatsSV.getRank(quantile, searchCrit); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * The approximate probability that the true rank is within the confidence interval |
| * specified by the upper and lower rank bounds for this sketch is 0.99. |
| */ |
| @Override |
| public double getRankLowerBound(final double rank) { |
| return max(0.0, rank - KllHelper.getNormalizedRankError(getMinK(), false)); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * The approximate probability that the true rank is within the confidence interval |
| * specified by the upper and lower rank bounds for this sketch is 0.99. |
| */ |
| @Override |
| public double getRankUpperBound(final double rank) { |
| return min(1.0, rank + KllHelper.getNormalizedRankError(getMinK(), false)); |
| } |
| |
| @Override |
| public double[] getRanks(final float[] quantiles, final QuantileSearchCriteria searchCrit) { |
| if (isEmpty()) { throw new IllegalArgumentException(THROWS_EMPTY); } |
| refreshSortedView(); |
| final int len = quantiles.length; |
| final double[] ranks = new double[len]; |
| for (int i = 0; i < len; i++) { |
| ranks[i] = kllFloatsSV.getRank(quantiles[i], searchCrit); |
| } |
| return ranks; |
| } |
| |
| @Override |
| @SuppressFBWarnings(value = "EI_EXPOSE_REP", justification = "OK in this case.") |
| public FloatsSortedView getSortedView() { |
| refreshSortedView(); |
| return kllFloatsSV; |
| } |
| |
| @Override |
| public QuantilesFloatsSketchIterator iterator() { |
| return new KllFloatsSketchIterator(getFloatItemsArray(), getLevelsArray(), getNumLevels()); |
| } |
| |
| /** |
| * {@inheritDoc} |
| * <p>The parameter <i>k</i> will not change.</p> |
| */ |
| @Override |
| public final void reset() { |
| if (readOnly) { kllSketchThrow(TGT_IS_READ_ONLY); } |
| final int k = getK(); |
| setN(0); |
| setMinK(k); |
| setNumLevels(1); |
| setLevelZeroSorted(false); |
| setLevelsArray(new int[] {k, k}); |
| setMinFloatItem(Float.NaN); |
| setMaxFloatItem(Float.NaN); |
| setFloatItemsArray(new float[k]); |
| } |
| |
| @Override |
| public byte[] toByteArray() { |
| return KllHelper.toCompactByteArrayImpl(this); |
| } |
| |
| @Override |
| public void update(final float item) { |
| if (readOnly) { kllSketchThrow(TGT_IS_READ_ONLY); } |
| KllFloatsHelper.updateFloat(this, item); |
| kllFloatsSV = null; |
| } |
| |
| //restricted |
| |
| /** |
| * @return full size of internal items array including garbage. |
| */ |
| abstract float[] getFloatItemsArray(); |
| |
| abstract float getFloatSingleItem(); |
| |
| abstract float getMaxFloatItem(); |
| |
| abstract float getMinFloatItem(); |
| |
| private final void refreshSortedView() { |
| kllFloatsSV = (kllFloatsSV == null) ? new KllFloatsSketchSortedView(this) : kllFloatsSV; |
| } |
| |
| abstract void setFloatItemsArray(float[] floatItems); |
| |
| abstract void setFloatItemsArrayAt(int index, float item); |
| |
| abstract void setMaxFloatItem(float item); |
| |
| abstract void setMinFloatItem(float item); |
| |
| void nullSortedView() { kllFloatsSV = null; } |
| |
| } |