kaivalnp commented on code in PR #16030: URL: https://github.com/apache/lucene/pull/16030#discussion_r3992178935
########## lucene/core/src/java/org/apache/lucene/codecs/lucene106/Lucene106ScalarQuantizedVectorsWriter.java: ########## @@ -0,0 +1,1104 @@ +/* + * 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.lucene.codecs.lucene106; + +import static org.apache.lucene.codecs.lucene106.Lucene106ScalarQuantizedVectorsFormat.DIRECT_MONOTONIC_BLOCK_SHIFT; +import static org.apache.lucene.codecs.lucene106.Lucene106ScalarQuantizedVectorsFormat.QUANTIZED_VECTOR_COMPONENT; +import static org.apache.lucene.index.VectorSimilarityFunction.COSINE; +import static org.apache.lucene.search.DocIdSetIterator.NO_MORE_DOCS; +import static org.apache.lucene.util.RamUsageEstimator.shallowSizeOfInstance; +import static org.apache.lucene.util.quantization.OptimizedScalarQuantizer.transposeHalfByte; + +import java.io.IOException; +import java.nio.ByteBuffer; +import java.nio.ByteOrder; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.List; +import org.apache.lucene.codecs.CodecUtil; +import org.apache.lucene.codecs.KnnVectorsReader; +import org.apache.lucene.codecs.hnsw.FlatFieldVectorsWriter; +import org.apache.lucene.codecs.hnsw.FlatVectorsWriter; +import org.apache.lucene.codecs.lucene95.OrdToDocDISIReaderConfiguration; +import org.apache.lucene.index.DocIDMerger; +import org.apache.lucene.index.DocsWithFieldSet; +import org.apache.lucene.index.FieldInfo; +import org.apache.lucene.index.FloatVectorValues; +import org.apache.lucene.index.IndexFileNames; +import org.apache.lucene.index.KnnVectorValues; +import org.apache.lucene.index.MergeState; +import org.apache.lucene.index.SegmentWriteState; +import org.apache.lucene.index.Sorter; +import org.apache.lucene.index.VectorEncoding; +import org.apache.lucene.index.VectorSimilarityFunction; +import org.apache.lucene.internal.hppc.FloatArrayList; +import org.apache.lucene.search.DocIdSetIterator; +import org.apache.lucene.search.VectorScorer; +import org.apache.lucene.store.IndexOutput; +import org.apache.lucene.util.ArrayUtil; +import org.apache.lucene.util.IOUtils; +import org.apache.lucene.util.RamUsageEstimator; +import org.apache.lucene.util.VectorUtil; +import org.apache.lucene.util.quantization.OptimizedScalarQuantizer; +import org.apache.lucene.util.quantization.QuantizedByteVectorValues; +import org.apache.lucene.util.quantization.QuantizedByteVectorValues.ScalarEncoding; + +/** + * Writes quantized vector values and metadata to index segments in the format for Lucene 10.5. + * + * @lucene.experimental + */ +public class Lucene106ScalarQuantizedVectorsWriter extends FlatVectorsWriter { + private static final long SHALLOW_RAM_BYTES_USED = + shallowSizeOfInstance(Lucene106ScalarQuantizedVectorsWriter.class); + + private final SegmentWriteState segmentWriteState; + private final List<FieldWriter> fields = new ArrayList<>(); + private final IndexOutput meta, vectorData; + private final ScalarEncoding encoding; + private final boolean enableCentering; + private final FlatVectorsWriter rawVectorDelegate; + private boolean finished; + + /** Sole constructor */ + public Lucene106ScalarQuantizedVectorsWriter( + SegmentWriteState state, + ScalarEncoding encoding, + boolean enableCentering, + FlatVectorsWriter rawVectorDelegate, + Lucene106ScalarQuantizedVectorScorer vectorsScorer) + throws IOException { + super(vectorsScorer); + this.encoding = encoding; + this.enableCentering = enableCentering; + this.segmentWriteState = state; + String metaFileName = + IndexFileNames.segmentFileName( + state.segmentInfo.name, + state.segmentSuffix, + Lucene106ScalarQuantizedVectorsFormat.META_EXTENSION); + + String vectorDataFileName = + IndexFileNames.segmentFileName( + state.segmentInfo.name, + state.segmentSuffix, + Lucene106ScalarQuantizedVectorsFormat.VECTOR_DATA_EXTENSION); + this.rawVectorDelegate = rawVectorDelegate; + try { + meta = state.directory.createOutput(metaFileName, state.context); + vectorData = state.directory.createOutput(vectorDataFileName, state.context); + + CodecUtil.writeIndexHeader( + meta, + Lucene106ScalarQuantizedVectorsFormat.META_CODEC_NAME, + Lucene106ScalarQuantizedVectorsFormat.VERSION_CURRENT, + state.segmentInfo.getId(), + state.segmentSuffix); + CodecUtil.writeIndexHeader( + vectorData, + Lucene106ScalarQuantizedVectorsFormat.VECTOR_DATA_CODEC_NAME, + Lucene106ScalarQuantizedVectorsFormat.VERSION_CURRENT, + state.segmentInfo.getId(), + state.segmentSuffix); + } catch (Throwable t) { + IOUtils.closeWhileSuppressingExceptions(t, this); + throw t; + } + } + + @Override + public FlatFieldVectorsWriter<?> addField(FieldInfo fieldInfo) throws IOException { + if (fieldInfo.getVectorEncoding().equals(VectorEncoding.FLOAT32)) { Review Comment: Nice! -- This is an automated message from the Apache Git Service. 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