kaivalnp commented on code in PR #14178: URL: https://github.com/apache/lucene/pull/14178#discussion_r1948092653
########## lucene/sandbox/src/java22/org/apache/lucene/sandbox/codecs/faiss/FaissKnnVectorsWriter.java: ########## @@ -0,0 +1,204 @@ +/* + * 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.sandbox.codecs.faiss; + +import static org.apache.lucene.sandbox.codecs.faiss.FaissKnnVectorsFormat.DATA_CODEC_NAME; +import static org.apache.lucene.sandbox.codecs.faiss.FaissKnnVectorsFormat.DATA_EXTENSION; +import static org.apache.lucene.sandbox.codecs.faiss.FaissKnnVectorsFormat.META_CODEC_NAME; +import static org.apache.lucene.sandbox.codecs.faiss.FaissKnnVectorsFormat.META_EXTENSION; +import static org.apache.lucene.sandbox.codecs.faiss.FaissKnnVectorsFormat.NAME; +import static org.apache.lucene.sandbox.codecs.faiss.FaissKnnVectorsFormat.VERSION_CURRENT; +import static org.apache.lucene.sandbox.codecs.faiss.LibFaissC.createIndex; +import static org.apache.lucene.sandbox.codecs.faiss.LibFaissC.indexWrite; + +import java.io.IOException; +import java.lang.foreign.Arena; +import java.lang.foreign.MemorySegment; +import java.nio.file.Files; +import java.nio.file.Path; +import org.apache.lucene.codecs.BufferingKnnVectorsWriter; +import org.apache.lucene.codecs.CodecUtil; +import org.apache.lucene.codecs.KnnFieldVectorsWriter; +import org.apache.lucene.codecs.KnnVectorsWriter; +import org.apache.lucene.index.ByteVectorValues; +import org.apache.lucene.index.FieldInfo; +import org.apache.lucene.index.FloatVectorValues; +import org.apache.lucene.index.IndexFileNames; +import org.apache.lucene.index.MergeState; +import org.apache.lucene.index.SegmentWriteState; +import org.apache.lucene.index.Sorter; +import org.apache.lucene.index.VectorSimilarityFunction; +import org.apache.lucene.store.IndexOutput; +import org.apache.lucene.store.InputStreamDataInput; +import org.apache.lucene.util.IOUtils; + +public final class FaissKnnVectorsWriter extends BufferingKnnVectorsWriter { + private final String description, indexParams; + private final KnnVectorsWriter rawVectorsWriter; + private final IndexOutput meta, data; + private boolean finished; + + public FaissKnnVectorsWriter( + String description, + String indexParams, + SegmentWriteState state, + KnnVectorsWriter rawVectorsWriter) + throws IOException { + this.description = description; + this.indexParams = indexParams; + this.rawVectorsWriter = rawVectorsWriter; + this.finished = false; + + boolean failure = true; + try { + this.meta = openOutput(state, META_EXTENSION, META_CODEC_NAME); + this.data = openOutput(state, DATA_EXTENSION, DATA_CODEC_NAME); + failure = false; + } finally { + if (failure) { + IOUtils.closeWhileHandlingException(this); + } + } + } + + private IndexOutput openOutput(SegmentWriteState state, String extension, String codecName) + throws IOException { + String fileName = + IndexFileNames.segmentFileName(state.segmentInfo.name, state.segmentSuffix, extension); + IndexOutput output = state.directory.createOutput(fileName, state.context); + CodecUtil.writeIndexHeader( + output, codecName, VERSION_CURRENT, state.segmentInfo.getId(), state.segmentSuffix); + return output; + } + + @Override + @SuppressWarnings("unchecked") + public KnnFieldVectorsWriter<?> addField(FieldInfo fieldInfo) throws IOException { + return switch (fieldInfo.getVectorEncoding()) { + case BYTE -> throw new UnsupportedOperationException("Byte vectors not supported"); + case FLOAT32 -> + new KnnFieldVectorsWriter<float[]>() { + private final KnnFieldVectorsWriter<float[]> rawWriter = + (KnnFieldVectorsWriter<float[]>) rawVectorsWriter.addField(fieldInfo); + private final KnnFieldVectorsWriter<float[]> writer = + (KnnFieldVectorsWriter<float[]>) FaissKnnVectorsWriter.super.addField(fieldInfo); + + @Override + public long ramBytesUsed() { + return rawWriter.ramBytesUsed() + writer.ramBytesUsed(); + } + + @Override + public void addValue(int i, float[] floats) throws IOException { + rawWriter.addValue(i, floats); + writer.addValue(i, floats); + } + + @Override + public float[] copyValue(float[] floats) { + return floats.clone(); + } + }; + }; + } + + @Override + public void mergeOneField(FieldInfo fieldInfo, MergeState mergeState) throws IOException { + rawVectorsWriter.mergeOneField(fieldInfo, mergeState); + super.mergeOneField(fieldInfo, mergeState); + } + + @Override + protected void writeField(FieldInfo fieldInfo, FloatVectorValues floatVectorValues, int maxDoc) + throws IOException { + int number = fieldInfo.number; + meta.writeInt(number); + + VectorSimilarityFunction function = fieldInfo.getVectorSimilarityFunction(); + int size = floatVectorValues.size(); + + // TODO: Non FS-based approach? + Path tempFile = Files.createTempFile(NAME, fieldInfo.name); Review Comment: @navneet1v added a commit for this, along with a corresponding PR for Faiss changes (https://github.com/facebookresearch/faiss/pull/4180) Relative performance looks unchanged: Lucene: ``` recall latency (ms) nDoc topK fanout maxConn beamWidth quantized index s index docs/s force merge s num segments index size (MB) vec disk (MB) vec RAM (MB) 0.835 1.850 200000 100 50 32 200 no 147.95 1351.77 0.01 1 236.93 228.882 228.882 ``` Faiss: ``` recall latency (ms) nDoc topK fanout maxConn beamWidth quantized index s index docs/s force merge s num segments index size (MB) vec disk (MB) vec RAM (MB) 0.830 1.510 200000 100 50 32 200 no 139.42 1434.47 0.00 1 511.97 228.882 228.882 ``` -- This is an automated message from the Apache Git Service. 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